Download LTC5592 - Dual 1.6GHz to 2.7GHz High Dynamic Range

LTC5592
Dual 1.6GHz to 2.7GHz
High Dynamic Range
Downconverting Mixer
Description
Features
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Conversion Gain: 8.3dB at 2.35GHz
IIP3: 27.3dBm at 2.35GHz
Noise Figure: 9.8dB at 2.35GHz
15.3dB NF Under 5dBm Blocking
High Input P1dB
47dB Channel-to-Channel Isolation
3.3V Supply, 1.3W Power Consumption
Low Power Mode for 0.8W Consumption
Independent Channel Shutdown Control
50Ω Single-Ended RF and LO Inputs
LO Input Matched In All Modes
0dBm LO Drive Level
Small Package and Solution Size
–40°C to 105°C Operation
The LTC®5592 is part of a family of dual-channel high dynamic range, high gain downconverting mixers covering
the 600MHz to 4.5GHz RF frequency range. The LTC5592
is optimized for 1.6GHz to 2.7GHz RF applications. The
LO frequency must fall within the 1.5GHz to 2.5GHz
range for optimum performance. A typical application
is a LTE or WiMAX receiver with a 2.3GHz to 2.7GHz RF
input and low side LO.
The LTC5592’s high conversion gain and high dynamic
range enable the use of lossy IF filters in high selectivity
receiver designs, while minimizing the total solution cost,
board space and system-level variation. A low current
mode is provided for additional power savings and each
of the mixer channels has independent shutdown control.
Applications
High Dynamic Range Dual Downconverting Mixer Family
3G/4G Wireless Infrastructure Diversity Receivers
(LTE, W-CDMA, TD-SCDMA, WiMAX, GSM 1800)
n MIMO Infrastructure Diversity Receivers
n High Dynamic Range Downmixer Applications
n
PART NUMBER
RF RANGE
LO RANGE
LTC5590
600MHz to 1.7GHz
700MHz to 1.5GHz
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC5591
1.3GHz to 2.3GHz
1.4GHz to 2.1GHz
LTC5592
1.6GHz to 2.7GHz
1.5GHz to 2.5GHz
LTC5593
2.3GHz to 4.5GHz
2.1GHz to 4.2GHz
Typical Application
Wideband Conversion Gain
and IIP3 vs IF Frequency
Wideband LTE Receiver
190MHz
SAW
VCCIF
3.3V or 5V
1µF
22pF
IFA
RF
2300MHz TO
2400MHz
RF
2300MHz TO
2400MHz
LNA
IF
AMP
IFA
BIAS
150nH
IF
AMP
25
9
24
GC
23
LO = 2160MHz
PLO = 0dBm
RF = 2350 ±30MHz
TEST CIRCUIT IN FIGURE 1
170
180
200
190
IF FREQUENCY (MHz)
22
210
21
220
5592 TA01b
VCCB
LTC5592 ONLY, MEASURED ON EVALUATION BOARD
VCC
22pF
150nH
1nF
26
6
160
ENB
(0V/3.3V)
BIAS
IFB–
27
10
8
SYNTH
ENB
IFB+
22pF
LO 2160MHz
LO
AMP
RFB
VCCIF
2.2pF
28
IIP3
12
11
ENA
(0V/3.3V)
ENA
LO
1µF
VCC
3.3V
7
IMAGE
BPF 22pF
LNA
22pF
RFA
LO
AMP
29
13
VCCA
–
14
ADC
IIP3 (dBm)
+
IMAGE
BPF 22pF
IF
AMP
1nF
150nH
150nH
190MHz
BPF
GC (dB)
1nF
1nF 190MHz
SAW
190MHz
BPF
IF
AMP
ADC
5592 TA01a
5592fa
For more information www.linear.com/LTC5592
1
LTC5592
Absolute Maximum Ratings
Pin Configuration
(Note 1)
Supply Voltage (VCC)................................................4.0V
IF Supply Voltage (VCCIF)..........................................5.5V
Enable Voltage (ENA, ENB)...............–0.3V to VCC + 0.3V
Bias Adjust Voltage (IFBA, IFBB).......–0.3V to VCC + 0.3V
Power Select Voltage (ISEL) .............–0.3V to VCC + 0.3V
LO Input Power (1GHz to 3GHz)..............................9dBm
LO Input DC Voltage................................................ ±0.1V
RFA, RFB Input Power (1GHz to 3GHz).................15dBm
RFA, RFB Input DC Voltage..................................... ±0.1V
Operating Temperature Range (TC)......... –40°C to 105°C
Storage Temperature Range................... –65°C to 150°C
Junction Temperature (TJ)..................................... 150°C
VCCA
IFBA
IFA–
IFA+
IFGNDA
GND
TOP VIEW
24 23 22 21 20 19
RFA 1
18 ISEL
CTA 2
17 ENA
GND 3
16 LO
25
GND
GND 4
15 GND
13 GND
VCCB
IFBB
9 10 11 12
IFB–
8
IFB+
7
GND
14 ENB
RFB 6
IFGNDB
CTB 5
UH PACKAGE
24-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJC = 7°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC5592IUH#PBF
LTC5592IUH#TRPBF
5592
24-Lead (5mm × 5mm) Plastic QFN
–40°C to 105°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
V
DC
Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C,
unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCCA, VCCB Supply Voltage (Pins 12, 19)
3.1
3.3
3.5
V
VCCIFA, VCCIFB Supply Voltage (Pins 9, 10, 21, 22)
3.1
3.3
5.3
V
Power Supply Requirements (VCCA, VCCB, VCCIFA, VCCIFB)
Mixer Supply Current (Pins 12, 19)
Both Channels Enabled
199
237
mA
IF Amplifier Supply Current (Pins 9, 10, 21, 22)
Both Channels Enabled
202
252
mA
Total Supply Current (Pins 9, 10, 12, 19, 21, 22)
Both Channels Enabled
401
489
mA
Total Supply Current – Shutdown
ENA = ENB = Low
500
µA
Enable Logic Input (ENA, ENB) High = On, Low = Off
ENA, ENB Input High Voltage (On)
2.5
V
ENA, ENB Input Low Voltage (Off)
ENA, ENB Input Current
–0.3V to VCC + 0.3V
–20
0.3
V
30
µA
Turn On Time
0.9
µs
Turn Off Time
1
µs
2
5592fa
For more information www.linear.com/LTC5592
LTC5592
V
DC
Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C,
unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Low Power Mode Logic Input (ISEL) High = Low Power, Low = Normal Power Mode
ISEL Input High Voltage
2.5
V
ISEL Input Low Voltage
ISEL Input Current
–0.3V to VCC + 0.3V
–20
0.3
V
30
µA
Low Power Mode Current Consumption (ISEL = High)
Mixer Supply Current (Pins 12, 19)
Both Channels Enabled
130
156
mA
IF Amplifier Supply Current (Pins 9, 10, 21, 22)
Both Channels Enabled
122
156
mA
Total Supply Current (Pins 9, 10, 12, 19, 21, 22)
Both Channels Enabled
252
312
mA
V
AC
Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C,
PLO = 0dBm, PRF = –3dBm (∆f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
PARAMETER
CONDITIONS
MIN
LO Input Frequency Range
TYP
MAX
UNITS
1500 to 2500
MHz
1600 to 2700
1600 to 2300
MHz
MHz
5 to 500
MHz
RF Input Frequency Range
Low Side LO
High Side LO
IF Output Frequency Range
Requires External Matching
RF Input Return Loss
ZO = 50Ω, 1600MHz to 2700MHz
>13
dB
LO Input Return Loss
ZO = 50Ω, 1700MHz to 2500MHz
>17
dB
IF Output Impedance
Differential at 190MHz
379Ω||2.2pF
R||C
LO Input Power
fLO = 1700MHz to 2500MHz
–4
0
6
dBm
LO to RF Leakage
fLO = 1700MHz to 2500MHz
<–34
dBm
LO to IF Leakage
fLO = 1700MHz to 2500MHz
<–37
dBm
RF to LO Isolation
fRF = 1600MHz to 2700MHz
>57
dB
RF to IF Isolation
fRF = 1600MHz to 2700MHz
>37
dB
Channel-to-Channel Isolation
fRF = 1600MHz to 2700MHz
>47
dB
Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
PARAMETER
CONDITIONS
MIN
TYP
Conversion Gain
RF = 1950MHz
RF = 2350MHz
RF = 2550MHz
6.8
9.5
8.3
8.1
dB
dB
dB
Conversion Gain Flatness
RF = 2350 ±30MHz, LO = 2160MHz, IF = 190 ±30MHz
±0.14
dB
Conversion Gain vs Temperature
TC = –40ºC to 105ºC, RF = 2350MHz
–0.006
dB/°C
Input 3rd Order Intercept
RF = 1950MHz
RF = 2350MHz
RF = 2550MHz
26.3
27.3
26.3
dBm
dBm
dBm
SSB Noise Figure
RF = 1950MHz
RF = 2350MHz
RF = 2550MHz
9.4
9.8
9.9
dB
dB
dB
24.0
MAX
UNITS
5592fa
For more information www.linear.com/LTC5592
3
LTC5592
V
AC
Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, TC = 25°C, PLO = 0dBm,
PRF = –3dBm (∆f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
PARAMETER
CONDITIONS
MIN
SSB Noise Figure Under Blocking
fRF = 2400MHz, fLO = 2210MHz, fBLOCK = 2500MHz
PBLOCK = 5dBm
PBLOCK = 10dBm
2RF-2LO Output Spurious Product
(fRF = fLO + fIF/2)
TYP
MAX
UNITS
15.3
21.2
dB
dB
fRF = 2255MHz at –10dBm, fLO = 2160MHz,
fIF = 190MHz
–68
dBc
3RF-3LO Output Spurious Product
(fRF = fLO + fIF/3)
fRF = 2223.33MHz at –10dBm, fLO = 2160MHz,
fIF = 190MHz
–74
dBc
Input 1dB Compression
fRF = 2350MHz, VCCIF = 3.3V
fRF = 2350MHz, VCCIF = 5V
11
14.6
dBm
dBm
Low Power Mode, Low Side LO Downmixer Application: ISEL = High, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Conversion Gain
RF = 2350MHz
7.1
dB
Input 3rd Order Intercept
RF = 2350MHz
22.3
dBm
SSB Noise Figure
RF = 2350MHz
10.2
dB
Input 1dB Compression
RF = 2350MHz, VCCIF = 3.3V
RF = 2350MHz, VCCIF = 5V
11.3
12.6
dBm
dBm
High Side LO Downmixer Application: ISEL = Low, RF = 1600MHz to 2300MHz, IF = 190MHz, fLO = fRF + fIF
PARAMETER
CONDITIONS
Conversion Gain
RF = 1750MHz
RF = 1950MHz
RF = 2150MHz
Conversion Gain Flatness
MIN
TYP
MAX
UNITS
9.1
8.7
8.3
dB
dB
dB
RF = 1950 ±30MHz, LO = 2140MHz, IF = 190 ±30MHz
±0.33
dB
Conversion Gain vs Temperature
TC = –40ºC to 105ºC, RF = 1900MHz
–0.005
dB/°C
Input 3rd Order Intercept
RF = 1750MHz
RF = 1950MHz
RF = 2150MHz
25.3
25.4
25.1
dBm
dBm
dBm
SSB Noise Figure
RF = 1750MHz
RF = 1950MHz
RF = 2150MHz
9.2
9.8
10.4
dB
dB
dB
SSB Noise Figure Under Blocking
fRF = 1950MHz, fLO = 2140MHz, fBLOCK = 1850MHz
PBLOCK = 5dBm
PBLOCK = 10dBm
16.5
22.7
dB
dB
2LO-2RF Output Spurious Product
(fRF = fLO – fIF/2)
fRF = 2045MHz at –10dBm, fLO = 2140MHz,
fIF = 190MHz
–68
dBc
3LO-3RF Output Spurious Product
(fRF = fLO – fIF/3)
fRF = 2076.67MHz at –10dBm, fLO = 2140MHz,
fIF = 190MHz
–75
dBc
Input 1dB Compression
RF = 1950MHz, VCCIF = 3.3V
RF = 1950MHz, VCCIF = 5V
10.6
14.0
dBm
dBm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC5592 is guaranteed functional over the case operating
temperature range of –40°C to 105°C (θJC = 7°C/W).
4
Note 3: SSB Noise Figure measured with a small-signal noise source,
bandpass filter and 6dB matching pad on RF input, bandpass filter and
6dB matching pad on the LO input, and no other RF signals applied.
Note 4: Channel A to channel B isolation is measured as the relative IF
output power of channel B to channel A, with the RF input signal applied to
channel A. The RF input of channel B is 50Ω terminated and both mixers
are enabled.
5592fa
For more information www.linear.com/LTC5592
LTC5592
Typical AC Performance Characteristics
Low Side LO
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain and IIP3 vs
RF Frequency
SSB NF vs RF Frequency
16
26
16
15
15
14
14
13
24
IIP3
–40°C
25°C
85°C
105°C
20
18
16
13
12
11
14
10
12
9
GC
10
GC (dB)
1700
1900 2100 2300 2500
RF FREQUENCY (MHz)
12
11
10
40
6
1500
6
2700
1700
1900 2100 2300 2500
RF FREQUENCY (MHz)
22
28
26
20
26
18
24
18
24
16
22
16
22
IIP3
12
16
10
14
8
NF
12
6
GC
10
6
–6
–4
4
–2
2
0
LO INPUT POWER (dBm)
6
18
14
12
16
10
14
8
NF
12
10
4
8
20
6
GC
0
0
–6
–4
4
–2
2
0
LO INPUT POWER (dBm)
6
Conversion Gain, IIP3 and NF vs
Supply Voltage (Single Supply)
30
24
30
20
28
22
28
18
26
20
26
16
24
12
10
16
14
8
NF
12
10
6
4
GC
20
12
16
10
14
8
NF
12
10
8
6
0
3.6
6
5592 G07
16
14
18
2
3.5
3.2
3.1
3.4
3.3
VCC, VCCIF SUPPLY VOLTAGE (V)
18
–40°C
25°C
85°C
22
8
3
IIP3
GC
3
6
RF = 2350MHz
4
VCC = 3.3V
2
4
3.5
5
4.5
VCCIF SUPPLY VOLTAGE (V)
0
5.5
5592 G08
SSB NF (dB)
18
14
SSB NF (dB)
RF = 2350MHz
VCC = VCCIF
20
–40°C
25°C
85°C
GC (dB), IIP3 (dBm)
22
26
22
4
GC
–6
2
–4
4
–2
2
0
LO INPUT POWER (dBm)
6
0
Conversion Gain, IIP3 and RF Input
P1dB vs Temperature
Conversion Gain, IIP3 and NF vs
Supply Voltage (Dual Supply)
IIP3
6
5592 G06
28
24
8
NF
12
5592 G05
5592 G04
12
10
14
6
6
16
14
16
8
8
18
–40°C
25°C
85°C
18
10
2
20
IIP3
20
4
2
22
SSB NF (dB)
18
14
–40°C
25°C
85°C
SSB NF (dB)
–40°C
25°C
85°C
IIP3
GC (dB), IIP3 (dBm)
28
20
GC (dB), IIP3 (dBm)
22
26
20
2700
2550MHz Conversion Gain, IIP3
and NF vs LO Power
28
22
2500
2100
2300
RF FREQUENCY (MHz)
5592 G03
2350MHz Conversion Gain, IIP3
and NF vs LO Power
SSB NF (dB)
GC (dB), IIP3 (dBm)
35
1900
2700
5592 G02
1950MHz Conversion Gain, IIP3
and NF vs LO Power
24
–40°C
25°C
85°C
7
5592 G01
GC (dB), IIP3 (dBm)
45
8
7
6
1500
50
9
8
8
–40°C
25°C
85°C
105°C
GC (dB), IIP3 (dBm), P1dB (dBm)
IIP3 (dBm)
22
Channel Isolation vs RF Frequency
55
ISOLATION (dB)
17
SSB NF (dB)
28
24
22
IIP3
VCCIF = 3.3V
VCCIF = 5V
RF = 2350MHz
20
18
16
14
12
P1dB
10
8
6
–40
GC
20
–10
80
50
CASE TEMPERATURE (°C)
110
5592 G09
5592fa
For more information www.linear.com/LTC5592
5
LTC5592
Typical AC Performance Characteristics
Low Side LO
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Single-Tone IF Output Power, 2 × 2
and 3 × 3 Spurs vs RF Input Power
20
20
10
10
–20
RF1 = 2349MHz
RF2 = 2351MHz
LO = 2160MHz
–30
–40
–50
IM3
–60
–10
–20
–30
–40
LO = 2160MHz
3RF-3LO
(RF = 2223.33MHz)
–50
–60
IM5
–70
2RF-2LO
(RF = 2255MHz)
–70
–80
–12
–6
–9
3
–3
0
RF INPUT POWER (dBm/TONE)
–80
–12
6
RELATIVE SPUR LEVEL (dBc)
–10
–55
IFOUT
(RF = 2350MHz)
0
IFOUT
–9
–6
0
–3
RF INPUT POWER (dBm)
LO LEAKAGE (dBm)
SSB NF (dB)
14
12
–30
LO-RF
1700
2300
1900
2100
LO FREQUENCY (MHz)
9
GAIN (dB)
5592 G16
6
1900 2100 2300 2500
RF FREQUENCY (MHz)
25
85°C
25°C
–40°C
45
85°C
25°C
–40°C
40
20
15
0
24.5
2700
SSB Noise Figure Distribution
RF = 2350MHz
35
30
25
20
15
10
5
8.5
1700
5592 G15
50
10
5
8
0
1500
2500
DISTRIBUTION (%)
30
DISTRIBUTION (%)
DISTRIBUTION (%)
10
RF = 2350MHz
35
10
RF-IF
30
IIP3 Distribution
40
RF = 2350MHz
0
7.5
40
5592 G14
Conversion Gain Distribution
15
RF-LO
20
LO-IF
–50
1500
10
85°C
25°C
–40°C
6
–3
3
0
LO INPUT POWER (dBm)
RF Isolation vs RF Frequency
–20
5592 G13
20
–6
50
10
25
–80
60
–40
–15
5
–10
–5
0
RF BLOCKER POWER (dBm)
3RF-3LO
(RF = 2223.33MHz)
70
–10
16
8
–20
–75
LO Leakage vs LO Frequency
RF = 2400MHz
BLOCKER = 2500MHz
18
2RF-2LO
(RF = 2255MHz)
–70
5592 G12
0
PLO = –3dBm
PLO = 0dBm
PLO = 3dBm
PLO = 6dBm
20
–65
5592 G11
SSB Noise Figure vs RF Blocker
Power
22
IF = 190MHz
PRF = –10dBm
LO = 2160MHz
–60
–85
6
3
5592 G10
24
2 × 2 and 3 × 3 Spur Suppression
vs LO Input Power
ISOLATION (dB)
0
OUTPUT POWER (dBm)
OUTPUT POWER (dBm/TONE)
2-Tone IF Output Power, IM3 and
IM5 vs RF Input Power
5
25.5
26.5
IIP3 (dBm)
27.5
28.5
5592 G17
0
7
8
9
10
NOISE FIGURE (dB)
11
12
5592 G18
5592fa
For more information www.linear.com/LTC5592
LTC5592
Typical AC Performance Characteristics
Low Power Mode, Low Side LO
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = High, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain and IIP3 vs
RF Frequency
16
14
15
21
13
14
–40°C 11
25°C
85°C 10
105°C 9
17
15
13
11
8
GC
9
7
5
1500
1700
GC (dB)
1900 2100 2300 2500
RF FREQUENCY (MHz)
13
12
11
10
9
7
8
6
7
6
1500
5
2700
IFOUT
1700
1900 2100 2300 2500
RF FREQUENCY (MHz)
1950MHz Conversion Gain, IIP3
and NF vs LO Power
–40
IM3
–60
IM5
–80
–12
2700
3
–6
–9
0
–3
RF INPUT POWER (dBm/TONE)
6
5592 G21
2350MHz Conversion Gain, IIP3
and NF vs LO Power
2550MHz Conversion Gain, IIP3
and NF vs LO Power
25
18
23
21
16
21
16
21
16
19
19
14
17
–40°C 14
25°C
85°C 12
15
10
13
8
9
GC
7
5
–6
–4
4
–2
2
0
LO INPUT POWER (dBm)
6
NF
17
12
15
10
13
8
–40°C
25°C 6
85°C
4
11
4
9
2
7
0
5
GC
–6
–4
4
–2
2
0
LO INPUT POWER (dBm)
5592 G22
6
20
NF
17
10
8
13
9
2
7
0
5
GC
–6
25
20
25
18
23
18
23
21
16
21
16
14
19
8
VCC = VCCIF
RF = 2350MHz
11
9
GC
7
5
3
–40°C 6
25°C
85°C 4
3.5
3.2
3.1
3.4
3.3
VCC, VCCIF SUPPLY VOLTAGE (V)
14
NF
17
12
15
10
13
8
VCC = 3.3V
RF = 2350MHz
11
9
2
7
0
3.6
5
5592 G25
IIP3
GC
3
–40°C
25°C
85°C
6
4
2
5
4
3.5
4.5
VCCIF SUPPLY VOLTAGE (V)
0
5.5
5592 G26
SSB NF (dB)
10
SSB NF (dB)
15
13
GC (dB), IIP3 (dBm)
20
12
4
2
–4
4
–2
2
0
LO INPUT POWER (dBm)
6
0
Conversion Gain, IIP3 and RF
Input P1dB vs Temperature
23
NF
6
5592 G24
25
17
–40°C
25°C
85°C
11
Conversion Gain, IIP3 and NF vs
Supply Voltage (Dual Supply)
IIP3
12
15
5592 G23
Conversion Gain, IIP3 and NF vs
Supply Voltage (Single Supply)
19
18
IIP3
SSB NF (dB)
6
19
14
SSB NF (dB)
NF
11
IIP3
GC (dB), IIP3 (dBm)
20
23
GC (dB), IIP3 (dBm)
25
18
IIP3
23
SSB NF (dB)
20
25
GC (dB), IIP3 (dBm)
RF1 = 2349MHz
RF2 = 2351MHz
LO = 2160MHz
–20
5592 G20
5592 G19
GC (dB), IIP3 (dBm)
0
GC (dB), IIP3 (dBm), P1dB (dBm)
IIP3 (dBm)
12
IIP3
20
–40°C
25°C
85°C
105°C
OUTPUT POWER (dBm/TONE)
15
23
NOISE FIGURE (dB)
25
19
2-Tone IF Output Power, IM3 and
IM5 vs RF Input Power
SSB NF vs RF Frequency
21
19
IIP3
VCCIF = 3.3V
VCCIF = 5V
17
15
P1dB
13
11
RF = 2350MHz
9
7
5
–40
GC
80
20
–10
50
CASE TEMPERATURE (°C)
110
5592 G27
5592fa
For more information www.linear.com/LTC5592
7
LTC5592
Typical AC Performance Characteristics
High Side LO
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain and IIP3 vs
RF Frequency
17
16
26
16
15
15
16
14
13
13
12
11
GC (dB)
18
10
GC
10
9
8
8
8
7
7
6
6
1600 1700 1800 1900 2000 2100 2200 2300
RF FREQUENCY (MHz)
50
40
35
1600 1700 1800 1900 2000 2100 2200 2300
RF FREQUENCY (MHz)
6
1600 1700 1800 1900 2000 2100 2200 2300
RF FREQUENCY (MHz)
5592 G30
5592 G29
1750MHz Conversion Gain, IIP3
and NF vs LO Power
1950MHz Conversion Gain, IIP3
and NF vs LO Power
2150MHz Conversion Gain, IIP3
and NF vs LO Power
28
22
28
22
20
26
20
26
20
24
18
24
18
24
16
22
16
22
IIP3
22
10
8
NF
12
6
10
8
6
GC
–6
–4
2
–2
0
LO INPUT POWER (dBm)
4
6
20
18
14
12
10
16
14
8
NF
20
18
14
6
10
8
2
8
6
0
6
2
0
GC
–6
–4
2
–2
0
LO INPUT POWER (dBm)
4
6
26
24
18
24
18
24
–40°C 16
25°C 14
85°C
12
22
8
NF
6
20
–40°C
25°C
85°C
RF = 1950MHz
16
14
18
12
16
10
14
8
NF
12
GC
VCC = 3.3V
6
4
10
8
2
8
2
6
0
3.6
6
0
5.5
10
GC
3
3.3
3.4
3.5
3.1
3.2
VCC, VCCIF SUPPLY VOLTAGE (V)
5592 G34
8
3
4.5
5
4
3.5
VCCIF SUPPLY VOLTAGE (V)
4
5592 G35
SSB NF (dB)
10
IIP3
GC (dB), IIP3 (dBm), P1dB (dBm)
28
20
GC (dB), IIP3 (dBm)
22
26
SSB NF (dB)
28
14
–4
2
–2
0
LO INPUT POWER (dBm)
4
6
0
Conversion Gain, IIP3 and
RF Input P1dB vs Temperature
20
12
–6
2
5592 G33
Conversion Gain, IIP3 and NF vs
Supply Voltage (Dual Supply)
16
GC
5592 G32
22
18
8
NF
4
6
26
20
10
16
28
VCC = VCCIF
RF = 1950MHz
14
12
12
10
Conversion Gain, IIP3 and NF vs
Supply Voltage (Single Supply)
IIP3
16
–40°C
25°C
85°C
4
12
4
5592 G31
22
18
IIP3
SSB NF (dB)
16
14
–40°C
25°C
85°C
SSB NF (dB)
18
–40°C
25°C 14
85°C 12
20
IIP3
GC (dB), IIP3 (dBm)
22
26
GC (dB), IIP3 (dBm)
28
SSB NF (dB)
GC (dB), IIP3 (dBm)
55
45
5592 G28
GC (dB), IIP3 (dBm)
60
11
9
–40°C
25°C
85°C
65
12
10
12
–40°C
25°C
85°C
105°C
14
14
–40°C
25°C
85°C
105°C
20
Channel Isolation vs RF Frequency
70
ISOLATION (dB)
IIP3
22
SSB NF (dB)
24
IIP3 (dBm)
SSB NF vs RF Frequency
28
22
IIP3
VCCIF = 3.3V
VCCIF = 5V
20
18
RF = 1950MHz
16
14
P1dB
12
10
8
6
–40
GC
50
80
20
–10
CASE TEMPERATURE (°C)
110
5592 G36
5592fa
For more information www.linear.com/LTC5592
LTC5592
Typical DC Performance Characteristics
ISEL = Low, ENA = ENB = High, test circuit shown in Figure 1.
VCC Supply Current vs Supply
Voltage (Mixer + LO Amplifier)
270
VCCIF = VCC
105°C
85°C
200
198
25°C
196
–40°C
194
105°C
460
3
3.1
3.3
3.4
3.5
3.2
VCC SUPPLY VOLTAGE (V)
210
25°C
190
170
130
3.6
VCC = 3.3V, VCCIF = 5V
(DUAL SUPPLY)
440
85°C
230
–40°C
150
192
190
480
VCC = 3.3V
250
202
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
204
Total Supply Current vs
Temperature (VCC + VCCIF)
SUPPLY CURRENT (mA)
206
VCCIF Supply Current vs
Supply Voltage (IF Amplifier)
420
400
VCC = VCCIF = 3.3V
(SINGLE SUPPLY)
380
360
340
320
300
3
3.3
3.6 3.9 4.2 4.5 4.8 5.1
VCCIF SUPPLY VOLTAGE (V)
5592 G37
280
–40
5.4
20
50
80
–10
CASE TEMPERATURE (°C)
5592 G38
110
5592 G39
ISEL = High, ENA = ENB = High, test circuit shown in Figure 1.
VCC Supply Current vs Supply
Voltage (Mixer + LO Amplifier)
170
VCCIF = VCC
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
105°C
132
85°C
130
25°C
128
–40°C
126
124
3
3.1
3.3
3.4
3.5
3.2
VCC SUPPLY VOLTAGE (V)
3.6
300
VCC = 3.3V
160
134
Total Supply Current vs
Temperature (VCC + VCCIF)
290
105°C
150
SUPPLY CURRENT (mA)
136
VCCIF Supply Current vs Supply
Voltage (IF Amplifier)
85°C
140
130
25°C
120
110
–40°C
100
280
270
260
250
240
90
220
210
–40
3.3
3.6 3.9 4.2 4.5 4.8 5.1
VCCIF SUPPLY VOLTAGE (V)
5592 G40
5.4
5592 G41
VCC = VCCIF = 3.3V
(SINGLE SUPPLY)
230
80
3
VCC = 3.3V, VCCIF = 5V
(DUAL SUPPLY)
20
50
80
–10
CASE TEMPERATURE (°C)
110
5592 G42
Pin Functions
RFA, RFB (Pins 1, 6): Single-Ended RF Inputs for Channels A and B. These pins are internally connected to the
primary sides of the RF input transformers, which have
low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated
transformer when DC voltage is present at the RF inputs.
The RF inputs are impedance matched when the LO input
is driven with a 0±6dBm source between 1.5GHz and
2.5GHz and the channels are enabled.
CTA, CTB (Pins 2, 5): RF Transformer Secondary CenterTap on Channels A and B. These pins may require bypass
capacitors to ground to optimize IIP3 performance. Each
pin has an internally generated bias voltage of 1.2V and
must be DC-isolated from ground and VCC.
GND (Pins 3, 4, 7, 13, 15, 24, Exposed Pad Pin 25):
Ground. These pins must be soldered to the RF ground
plane on the circuit board. The exposed pad metal of the
package provides both electrical contact to ground and
good thermal contact to the printed circuit board.
5592fa
For more information www.linear.com/LTC5592
9
LTC5592
Pin Functions
IFGNDB, IFGNDA (Pins 8, 23): DC Ground Returns for the
IF Amplifiers. These pins must be connected to ground to
complete the DC current paths for the IF amplifiers. Chip
inductors may be used to tune LO-IF and RF-IF leakage.
Typical DC current is 101mA for each pin.
ENB, ENA (Pins 14, 17): Enable Pins. These pins allow
Channels B and A, respectively, to be independently enabled. An applied voltage of greater than 2.5V activates
the associated channel while a voltage of less than 0.3V
disables the channel. Typical input current is less than
10μA. These pins must not be allowed to float.
IFB+, IFB–, IFA–, IFA+ (Pins 9, 10, 21, 22): Open-Collector
Differential Outputs for the IF Amplifiers of Channels B and
A. These pins must be connected to a DC supply through
impedance matching inductors, or transformer center-taps.
Typical DC current consumption is 50.5mA into each pin.
LO (Pin 16): Single-Ended Local Oscillator Input. This
pin is internally connected to the primary side of the LO
input transformer and has a low DC resistance to ground.
Series DC-blocking capacitors should be used to avoid
damage to the integrated transformer when DC voltage
present at LO input. The LO input is internally matched
to 50Ω for all states of ENA and ENB.
IFBB, IFBA (Pins 11, 20): Bias Adjust Pins for the IF
Amplifiers. These pins allow independent adjustment
of the internal IF buffer currents for channels B and A,
respectively. The typical DC voltage on these pins is 2.2V.
If not used, these pins must be DC isolated from ground
and VCC.
ISEL (Pin 18): Low Power Select Pin. When this pin is pulled
low (<0.3V), both mixer channels are biased at the normal
current level for best RF performance. When greater than
2.5V is applied, both channels operate at reduced current,
which provides reasonable performance at lower power
consumption. This pin must not be allowed to float.
VCCB and VCCA (Pins 12, 19): Power Supply Pins for the
LO Buffers and Bias Circuits. These pins must be connected to a regulated 3.3V supply with bypass capacitors
located close to the pins. Typical current consumption is
99.5mA per pin.
Block Diagram
24
GND
23
22
IFGNDA IFA+
21
IFA–
20
19
IFBA VCCA
IF
AMP
1
2
BIAS
ISEL
ENA
RFA
LO
AMP
CTA
LO
18
17
16
3 GND
4 GND
CTB
5
6
GND 15
LO
AMP
RFB
ENB
IF
AMP
14
BIAS
GND 13
7
10
IFB+
IFGNDB
GND
8
9
IFB–
10
IFBB
11
VCCB
12
5592 BD
5592fa
For more information www.linear.com/LTC5592
LTC5592
Test Circuit
T1A
4:1
IFA
50Ω
C7A
L1A
VCCIF
3.3V TO 5V
RF
0.015”
L2A
GND
DC1710A
EVALUATION BOARD
BIAS STACK-UP
GND (NELCO N4000-13)
0.062”
C6
24
RFA
50Ω
VCC
3.3V
C5A
C1A
23
GND IFGNDA
22
21
IFA+
–
IFA
C3A
20
19
IFBA
VCCA
ISEL
(0V/3.3V)
2 CTA
ENA 17
ENA
(0V/3.3V)
3 GND
LO 16
LTC5592
C8A
C2
LO
50Ω
25
GND
4 GND
GND 15
5 CTB
ENB 14
C8B
RFB
50Ω
C4
ISEL 18
1 RFA
0.015”
ENB
(0V/3.3V)
C1B
6 RFB
GND 13
GND IFGNDB IFB+
7
8
9
IFB–
IFBB
VCCB
10
11
12
5592 TC01
C3B
C5B
L2B
L1B
C7B
4:1
T1B
IFB
50Ω
REF DES
L1, L2 vs IF FREQUENCIES
VALUE
SIZE
VENDOR
C1A, C1B
22pF
0402
AVX
C2
2.2pF
0402
AVX
C3A, C3B
C5A, C5B
22pF
0402
AVX
C4, C6
1µF
0603
AVX
C7A, C7B
1000pF
0402
AVX
C8A, C8B
4.7pF
0402
AVX
0603
Coilcraft
IF (MHz)
L1, L2 (nH)
140
270
190
150
240
100
300
56
380
33
L1A, L1B
L2A, L2B
150nH
450
22
T1A, T1B
TC4-1W-7ALN+
Mini-Circuits
Figure 1. Standard Downmixer Test Circuit Schematic (190MHz IF)
5592fa
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11
LTC5592
Applications Information
Introduction
The LTC5592 consists of two identical mixer channels
driven by a common LO input signal. Each high linearity
mixer consists of a passive double-balanced mixer core,
IF buffer amplifier, LO buffer amplifier and bias/enable
circuits. See the Pin Functions and Block Diagram sections
for a description of each pin. Each of the mixers can be
shutdown independently to reduce power consumption and
low current mode can be selected that allows a trade-off
between performance and power consumption. The RF and
LO inputs are single-ended and are internally matched to
50Ω. Low side or high side LO injection can be used. The
IF outputs are differential. The evaluation circuit, shown in
Figure 1, utilizes bandpass IF output matching and an IF
transformer to realize a 50Ω single-ended IF output. The
evaluation board layout is shown in Figure 2.
The secondary winding of the RF transformer is internally connected to the channel A passive mixer core. The
center-tap of the transformer secondary is connected to
Pin 2 (CTA) to allow the connection of bypass capacitor,
C8A. The value of C8A can be adjusted to improve channel
isolation at specific RF frequencies with minor impact to
conversion gain, linearity and noise performance. When
used, it should be located within 2mm of Pin 2 for proper
high frequency decoupling. The nominal DC voltage on
the CTA pin is 1.2V.
For the RF inputs to be properly matched, the appropriate
LO signal must be applied to the LO input. A broadband
input match is realized with C1A = 22pF. The measured
input return loss is shown in Figure 4 for LO frequencies
of 1.7GHz, 2.16GHz and 2.5GHz. As shown in Figure 4,
the RF input impedance is dependent on LO frequency,
although a single value of C1A is adequate to cover the
1.7GHz to 2.5GHz RF band.
LTC5592
RFA
TO CHANNEL A
MIXER
C1A
1
2
RFA
CTA
C8A
5592 F03
5592 F02
Figure 3. Channel A RF Input Schematic
0
Figure 2. Evaluation Board Layout (DC1710A)
The RF inputs of channels A and B are identical. The RF
input of channel A, shown in Figure 3, is connected to the
primary winding of an integrated transformer. A 50Ω match
is realized when a series external capacitor, C1A, is connected to the RF input. C1A is also needed for DC blocking
if the source has DC voltage present, since the primary
side of the RF transformer is internally DC-grounded. The
DC resistance of the primary is approximately 3.9Ω.
12
–5
RETURN LOSS (dB)
RF Inputs
LO = 1700MHz
LO = 2160MHz
LO = 2500MHz
–10
–15
–20
–25
1500 1700
For more information www.linear.com/LTC5592
1900 2100 2300
FREQUENCY (MHz)
2500
2700
5592 F04
Figure 4. RF Port Return Loss
5592fa
LTC5592
Applications Information
Table 1. RF Input Impedance and S11
(at Pin 1, No External Matching, fLO = 2.16GHz)
FREQUENCY
(GHz)
RF INPUT
IMPEDANCE
S11
MAG
ANGLE
1.6
66.0 + j6.8
0.15
20
1.7
62.4 + j0.5
0.11
2
1.8
57.9 – j3.8
0.08
–24
1.9
53.2 – j6.1
0.07
–59
2.0
48.5 – j8.8
0.09
–95
2.1
40.6 – j9.3
0.14
–130
2.2
35.0 – j0.1
0.18
–180
2.3
39.3 + j3.7
0.13
–201
2.4
41.2 + j3.9
0.11
–207
2.5
41.7 + j4.3
0.10
–211
2.6
42.8 + j4.1
0.09
–212
2.7
44.1 + j3.6
0.07
–213
The secondary of the transformer drives a pair of high
speed limiting differential amplifiers for channels A and B.
The LTC5592’s LO amplifiers are optimized for the 1.7GHz
to 2.5GHz LO frequency range; however, LO frequencies
outside this frequency range may be used with degraded
performance.
The LO port is always 50Ω matched when VCC is applied,
even when one or both of the channels is disabled. This
helps to reduce frequency pulling of the LO source when
the mixer is switched between different operating states.
Figure 6 illustrates the LO port return loss for the different
operating modes.
0
BOTH CHANNELS ON
ONE CHANNEL ON
BOTH CHANNELS OFF
–5
RETURN LOSS (dB)
The RF input impedance and input reflection coefficient,
versus RF frequency, are listed in Table 1. The reference
plane for this data is Pin 1 of the IC, with no external
matching, and the LO is driven at 2.16GHz.
–10
–15
–20
–25
LTC5592
BIAS
ISEL
ENA
TO
MIXER B
ENB
BIAS
1500
1700 1900 2100
FREQUENCY (MHz)
2300
2500
5592 F06
17
TO
MIXER A
LO
–30
1300
18
Figure 6. LO Input Return Loss
C2
LO
16
14
5592 F05
The nominal LO input level is 0dBm, though the limiting
amplifiers will deliver excellent performance over a ±6dBm
input power range. Table 2 lists the LO input impedance
and input reflection coefficient versus frequency.
Table 2. LO Input Impedance vs Frequency
(at Pin 16, No External Matching, ENA = ENB = High)
FREQUENCY
(GHz)
Figure 5. LO Input Schematic
LO Input
The LO input, shown in Figure 5, is connected to the
primary winding of an integrated transformer. A 50Ω
impedance match is realized at the LO port by adding
an external series capacitor, C2. This capacitor is also
needed for DC blocking if the LO source has DC voltage
present, since the primary side of the LO transformer is
DC-grounded internally. The DC resistance of the primary
is approximately 1.8Ω.
INPUT
IMPEDANCE
S11
MAG
ANGLE
1.7
46.4 + j34.4
0.34
76
1.8
47.0 + j31.0
0.31
78
1.9
46.5 + J28.2
0.28
81
2.0
44.4 + J26.8
0.28
86
2.1
43.1 + j26.0
0.28
89
2.2
41.8 + j26.2
0.29
91
2.3
40.4 + j27.4
0.31
92
2.4
38.8 + j28.5
0.33
94
2.5
38.0 + j30.4
0.35
93
For more information www.linear.com/LTC5592
5592fa
13
LTC5592
Applications Information
IF Outputs
The IF amplifiers in channels A and B are identical. The IF
amplifier for channel A, shown in Figure 7, has differential open collector outputs (IFA+ and IFA–), a DC ground
return pin (IFGNDA), and a pin for adjusting the internal
bias (IFBA). The IF outputs must be biased at the supply voltage (VCCIFA), which is applied through matching
inductors L1A and L2A. Alternatively, the IF outputs can
be biased through the center tap of a transformer (T1A).
The common node of L1A and L2A can be connected to
the center tap of the transformer. Each IF output pin draws
approximately 50.5mA of DC supply current (101mA total).
An external load resistor, R2A, can be used to improve
impedance matching if desired.
For optimum single-ended performance, the differential
IF output must be combined through an external IF
transformer or a discrete IF balun circuit. The evaluation
board (see Figures 1 and 2) uses a 4:1 IF transformer for
impedance transformation and differential to single-ended
conversion. It is also possible to eliminate the IF transformer
and drive differential filters or amplifiers directly.
The IF output impedance can be modeled as 379Ω in
parallel with 2.2pF. The equivalent small-signal model,
including bondwire inductance, is shown in Figure 8.
Frequency-dependent differential IF output impedance is
listed in Table 3. This data is referenced to the package
pins (with no external components) and includes the effects of IC and package parasitics.
IFGNDA (Pin 23) must be grounded or the amplifier will
not draw DC current. Inductor L3A may improve LO-IF
and RF-IF leakage performance in some applications, but
is otherwise not necessary. Inductors should have small
resistance for DC. High DC resistance in L3A will reduce
the IF amplifier supply current, which will degrade RF
performance.
T1A
22
LTC5592
0.9nH
23
IGNDA
5592 F08
Figure 8. IF Output Small-Signal Model
L2A
VCCIFA
22
IFA+
R1A
(OPTION TO
REDUCE
DC POWER)
C5A
R2A
LTC5592
21
20
IFBA
IFA–
VCCA
IF
AMP
Bandpass IF Matching
The bandpass IF matching configuration, shown in Figures
1 and 7, is best suited for IF frequencies in the 90MHz to
500MHz range. Resistor R2A may be used to reduce the IF
output resistance for greater bandwidth and inductors L1A
and L2A resonate with the internal IF output capacitance
at the desired IF frequency. The value of L1A, L2A can be
estimated as follows:
4mA
L1A = L2A =
BIAS
5592 F07
Figure 7. IF Amplifier Schematic with Bandpass Match
14
0.9nH
CIF
C7A
L3A (OR SHORT)
101mA
IFA–
RIF
IFA
4:1
L1A
21
IFA+
1
(2πfIF ) 2 • 2 • CIF 


where CIF is the internal IF capacitance (listed in Table 3).
5592fa
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LTC5592
Applications Information
Values of L1A and L2A are tabulated in Figure 1 for various IF frequencies. The measured IF output return loss
for bandpass IF matching is plotted in Figure 9.
T1A
VCCIFA
3.1 TO 5.3V
C6
C5A
L1A
Table 3. IF Output Impedance vs Frequency
90
403 || – j610 (2.9pF)
140
384 || – j474 (2.4pF)
190
379 || – j381 (2.2pF)
240
380 || – j316 (2.1pF)
300
377 || – j253 (2.1pF)
380
376 || – j210 (2.0pF)
450
360 || – j177 (2.0pF)
C9A
22
21
LTC5592
IFA–
5592 F10
0
–5
RETURN LOSS (dB)
–5
RETURN LOSS (dB)
IFA+
Figure 10. IF Output with Lowpass Matching
0
–10
270nH
–15
150nH
–20
180nH
–10
68nH
–15
82nH + 1k
–20
100nH
100nH
–25
L2A
R2A
DIFFERENTIAL OUTPUT
IMPEDANCE (RIF || XIF (CIF))
FREQUENCY (MHz)
IFA
50Ω
4:1
–25
56nH
22nH
0
33nH
50
100
150
FREQUENCY (MHz)
200
250
5592 F11
50 100 150 200 250 300 350 400 450 500
FREQUENCY (MHz)
5592 F09
Figure 9. IF Output Return Loss with Bandpass Matching
Figure 11. IF Output Return Loss with Lowpass Matching
board (see Figure 2) has been laid out to accommodate
this matching topology with only minor modifications.
Lowpass IF Matching
IF Amplifier Bias
For IF frequencies below 90MHz, the inductance values
become unreasonably high and the lowpass topology
shown in Figure 10 is preferred. This topology also can
provide improved RF to IF and LO to IF isolation. VCCIFA
is supplied through the center tap of the 4:1 transformer.
A lowpass impedance transformation is realized by shunt
elements R2A and C9A (in parallel with the internal RIF
and CIF), and series inductors L1A and L2A. Resistor
R2A is used to reduce the IF output resistance for greater
bandwidth, or it can be omitted for the highest conversion gain. The final impedance transformation to 50Ω is
realized by transformer T1A. The measured return loss
is shown in Figure 11 for different values of inductance
(C9A = open). The case with 82nH inductors and a 1k
load resistor (R2A) is also shown. The LTC5592 demo
The IF amplifier delivers excellent performance with VCCIF
= 3.3V, which allows a single supply to be used for VCC and
VCCIF . At VCCIF = 3.3V, the RF input P1dB of the mixer is
limited by the output voltage swing. For higher P1dB, in
this case, resistor R2A (Figure 7) can be used to reduce
the output impedance and thus the voltage swing, thus
improving P1dB. The trade-off for improved P1dB will be
lower conversion gain.
With VCCIF increased to 5V the P1dB increases by over 3dB,
at the expense of higher power consumption. Mixer P1dB
performance at 1950MHz and 2350MHz is tabulated in Table
4 for VCCIF values of 3.3V and 5V. For the highest conversion
gain, high-Q wire-wound chip inductors are recommended
for L1A and L2A. Low cost multilayer chip inductors may
be substituted, with a slight reduction in conversion gain.
5592fa
For more information www.linear.com/LTC5592
15
LTC5592
Applications Information
Table 4. Performance Comparison with VCCIF = 3.3V and 5V
Low Power Mode
(RF = 1950MHz, High Side LO, IF = 190MHz)
Both mixer channels can be set to low power mode using the ISEL pin. This allows flexibility to select a reduced
current mode of operation when lower RF performance is
acceptable, reducing power consumption by 37%. Figure
12 shows a simplified schematic of the ISEL pin interface.
When ISEL is set low (<0.3V), both channels operate at
nominal DC current. When ISEL is set high (>2.5V), the DC
current in both channels is reduced, thus reducing power
consumption. The performance in low power mode and
normal power mode are compared in Table 6.
VCCIF
(V)
R2A
(Ω)
ICCIF
(mA)
GC
(dB)
P1dB
(dBm)
IIP3
(dBm)
NF
(dB)
3.3
Open
202
8.7
10.6
25.4
9.8
1k
202
7.5
11.3
25.4
9.9
Open
209
8.7
14.0
25.5
9.9
5
(RF = 2350MHz, Low Side LO, IF = 190MHz)
VCCIF
(V)
R2A
(Ω)
ICCIF
(mA)
GC
(dB)
P1dB
(dBm)
IIP3
(dBm)
NF
(dB)
3.3
Open
202
8.3
11.0
27.3
9.8
1k
202
7.1
11.8
27.5
9.8
Open
209
8.1
14.6
28.0
10.0
5
LTC5592
VCCA
19
The IFBA pin (Pin 20) is available for reducing the DC
current consumption of the IF amplifier, at the expense of
IIP3. The nominal DC voltage at Pin 20 is 2.1V, and this pin
should be left open-circuited for optimum performance.
The internal bias circuit produces a 4mA reference for the
IF amplifier, which causes the amplifier to draw approximately 101mA. If resistor R1A is connected to Pin 20 as
shown in Figure 7, a portion of the reference current can
be shunted to ground, resulting in reduced IF amplifier
current. For example, R1A = 1k will shunt away 1.5mA
from Pin 20 and the IF amplifier current will be reduced
by 25% to approximately 75.5mA. Table 5 summarizes
RF performance versus IF amplifier current.
Table 5. Mixer Performance with Reduced IF Amplifier Current
RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Open
202
8.7
25.4
10.6
9.8
4.7kΩ
184
8.5
25.2
10.8
9.8
2.2kΩ
170
8.4
24.8
10.9
9.7
1kΩ
151
8.1
24.4
11.1
9.8
ISEL
18
500Ω
BIAS A
VCCB
BIAS B
5592 F13
Figure 12. ISEL Interface Schematic
Table 6. Performance Comparison Between Different Power Modes
RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Low
401
8.7
25.4
10.6
9.8
High
252
7.4
21.2
10.9
10.2
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Low
401
8.3
27.3
11.0
9.8
High
252
7.1
22.3
11.3
10.2
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Open
202
8.3
27.3
11.0
9.8
4.7kΩ
184
8.1
26.8
11.2
9.8
2.2kΩ
170
8.0
26.2
11.2
9.8
1kΩ
151
7.7
25.4
11.3
9.8
16
5592fa
For more information www.linear.com/LTC5592
LTC5592
Applications Information
Enable Interface
Table 7. IF Output Spur Levels (dBc), High Side LO
Figure 13 shows a simplified schematic of the ENA pin
interface (ENB is identical). To enable channel A, the ENA
voltage must be greater than 2.5V. If the enable function
is not required, the enable pin can be connected directly
to VCC. The voltage at the enable pin should never exceed
the power supply voltage (VCC) by more than 0.3V. If this
should occur, the supply current could be sourced through
the ESD diode, potentially damaging the IC.
LTC5592
VCCA
19
ENA
17
ESD
CLAMP
(RF = 1950MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C)
N
0
1
2
3
4
5
6
7
8
9
0
– –45.2 –46.9 –68.4 –70.8 –75.3 –72.0 –82.0
1 –51.0 0 –64.4 –54.5 –68.1 –66.3 –74.9 –72.2
2 –80.0 –80.9 –60.6 * –81.4 *
*
*
*
3
* –83.5 * –75.8 *
*
*
*
*
*
4
*
*
*
*
*
*
*
*
*
*
M
5
*
*
*
*
*
*
*
*
*
*
6
*
*
*
*
*
*
*
*
*
*
7
*
*
*
*
*
*
*
*
*
*
8
*
*
*
*
*
*
*
*
*
9
*
*
*
*
*
*
*
*
10
*
*
*
*
*
*
*
*Less than –90dBc
500Ω
Table 8. IF Output Spur Levels (dBc), Low Side LO
5592 F13
Figure 13. ENA Interface Schematic
The Enable pins must be pulled high or low. If left floating, the on/off state of the IC will be indeterminate. If a
three-state condition can exist at the enable pins, then a
pull-up or pull-down resistor must be used.
Supply Voltage Ramping
Fast ramping of the supply voltage can cause a current
glitch in the internal ESD protection circuits. Depending on
the supply inductance, this could result in a supply voltage transient that exceeds the maximum rating. A supply
voltage ramp time of greater than 1ms is recommended.
(RF = 2350MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C)
N
0
1
2
3
4
5
6
7
8
9
0
– –44.9 –46.2 –69.9 –69.7 –78.0 –71.9
1 –50.7 0 –63.1 –45.7 –67.0 –68.9 –71.1 –72.2 *
2 –77.8 –78.7 –66.5 * –89.1 *
*
*
*
*
3
*
*
* –70.1 *
*
*
*
*
*
4
*
*
*
*
*
*
*
*
*
*
M
5
*
*
*
*
*
*
*
*
*
*
6
*
*
*
*
*
*
*
*
*
*
7
*
*
*
*
*
*
*
*
*
8
*
*
*
*
*
*
*
*
9
*
*
*
*
*
*
*
10
*
*
*
*
*
*
*Less than –90dBc
Spurious Output Levels
Mixer spurious output levels versus harmonics of the RF
and LO are tabulated in Tables 7 and 8 for frequencies up
to 10GHz. The spur levels were measured on a standard
evalution board using the test circuit shown in Figure 1.
The spur frequencies can be calculated using the following equation:
fSPUR = (M • fRF) – (N • fLO)
5592fa
For more information www.linear.com/LTC5592
17
LTC5592
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
UH Package
UH Package
24-Lead Plastic
QFN (5mm × 5mm)
24-Lead LTC
Plastic
(5mm × 5mm)
(Reference
DWGQFN
# 05-08-1747
Rev A)
(Reference LTC DWG # 05-08-1747 Rev A)
0.75 ±0.05
5.40 ±0.05
3.90 ±0.05
3.20 ± 0.05
3.25 REF
3.20 ± 0.05
PACKAGE OUTLINE
0.30 ± 0.05
0.65 BSC
RECOMMENDED SOLDER PAD LAYOUT
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
5.00 ± 0.10
R = 0.05
TYP
0.75 ± 0.05
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
R = 0.150
TYP
23
PIN 1 NOTCH
R = 0.30 TYP
OR 0.35 × 45°
CHAMFER
24
0.55 ± 0.10
PIN 1
TOP MARK
(NOTE 6)
1
2
5.00 ± 0.10
3.25 REF
3.20 ± 0.10
3.20 ± 0.10
(UH24) QFN 0708 REV A
0.200 REF
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
18
0.30 ± 0.05
0.65 BSC
5592fa
For more information www.linear.com/LTC5592
LTC5592
Revision History
REV
DATE
DESCRIPTION
A
08/13
Changed LO lower frequency range from 1.7GHz to 1.5GHz.
PAGE NUMBER
1
LO Input Frequency Range: changed lower frequency from 1700MHz to 1500MHz.
3
RF Input Frequency Range, Low Side LO: changed lower frequency from 1900MHz to 1600MHz.
3
Updated “Conversion Gain and IIP3 vs RF Frequency” and “SSB NF vs RF Frequency” plots to include 1500MHz
frequency characteristics.
5
Updated “LO Leakage vs LO Frequency” plot to include 1500MHz frequency characteristics.
6
Updated “Conversion Gain and IIP3 vs RF Frequency” and “SSB NF vs RF Frequency” plots to include 1500MHz
frequency characteristics.
7
Pin Functions section RFA, RFB (Pins 1, 6): Changed LO input source lower frequency from 1.7GHz to 1.5GHz.
9
Right column, last paragraph. Deleted sentence: “These LO frequencies correspond to lower, middle and upper
values in the LO range.”
12
Figure 6, updated the LO Input Return Loss plot to include 1300MHz frequency characteristics.
13
5592fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representaFor more
information
www.linear.com/LTC5592
tion that the interconnection
of its circuits
as described
herein will not infringe on existing patent rights.
19
LTC5592
Typical Application
Downconverting Mixer with 470MHz IF
TC4-1W-17LN+
4:1
Conversion Gain, NF and IIP3
vs RF Frequency
IFA
50Ω
22pF
TO
CHANNEL B
RFA
50Ω
22pF
24
23
22
GND IFGNDA IFA+
21
20
1µF
TO
CHANNEL B
19
IFA– IFBA VCCA
1 RFA
ISEL 18
ISEL
2 CTA
ENA 17
ENA
28
12
27
11
10
26
NF
25
24
TA = 25°C
IF = 470MHz 23
LOW SIDE LO
22
9
8
7
GC
6
2100 2200
2300 2400 2500 2600
RF FREQUENCY (MHz)
IIP3 (dBm)
22pF
1µF
GC (dB), SSB NF (dB)
82nH
VCC
3.3V
VCCIF
3.3V
IIP3
13
1nF
82nH
29
14
21
2700
5592 TA02b
LTC5592
CHANNEL A
2.2pF
3 GND
LO 16
4 GND
GND 15
4.7pF
CHANNEL B NOT SHOWN
LO
50Ω
5590 TA02
Related Parts
PART
NUMBER
DESCRIPTION
Infrastructure
LTC5569
300MHz to 4GHz, 3.3V Dual Active
Downconverting Mixer
LT5557
400MHz to 3.8GHz, 3.3V Downconverting Mixer
LTC6416
2GHz 16-Bit ADC Buffer
LTC6412
31dB Linear Analog VGA
LTC554x
600MHz to 4GHz Downconverting Mixer Family
LT5554
Ultralow Distort IF Digital VGA
LT5578
400MHz to 2.7GHz Upconverting Mixer
LT5579
1.5GHz to 3.8GHz Upconverting Mixer
RF Power Detectors
LT5581
6GHz Low Power RMS Detector
LTC5582
10GHz RMS Power Detector
LTC5583
Dual 6GHz RMS Power Detector
ADCs
LTC2285
14-Bit, 125Msps Dual ADC
LTC2185
16-Bit, 125Msps Dual ADC Ultralow Power
LTC2242-12 12-Bit, 250Msps ADC
20 Linear Technology Corporation
COMMENTS
2dB Gain, 26.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/180mA Supply
2.9dB Gain, 24.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/82mA Supply
40.25dBm OIP3 to 300MHz, Programmable Fast Recovery Output Clamping
35dBm OIP3 at 240MHz, Continuous Gain Range –14dB to 17dB
8dB Gain, >25dBm IIP3, 10dB NF, 3.3V/200mA Supply
48dBm OIP3 at 200MHz, 2dB to 18dB Gain Range, 0.125dB Gain Steps
27dBm OIP3 at 900MHz, 24.2dBm at 1.95GHz, Integrated RF Transformer
27.3dBm OIP3 at 2.14GHz, NF = 9.9dB, 3.3V Supply, Single-Ended LO and RF Ports
40dB Dynamic Range, ±1dB Accuracy Over Temperature, 1.5mA Supply Current
40MHz to 10GHz, Up to 57dB Dynamic Range, ±0.5dB Accuracy Over Temperature
40MHz to 6GHz, Up to 60dB Dynamic Range, >40dB Channel-to-Channel Isolation
72.4dB SNR, >88dB SFDR, 790mW Power Consumption
74.8dB SNR, 185mW/Channel Power Consumption
65.4dB SNR, 78dB SFDR, 740mW Power Consumption
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LTC5592
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LTC5592
5592fa
LT 0813 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2011