Download MAX2092 700MHz to 2700MHz Analog VGA with Threshold General Description

19-6377; Rev 0; 6/12
EVALUATION KIT AVAILABLE
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
General Description
The MAX2092 high-linearity analog variable-gain ampli­fier
(VGA) is a monolithic SiGe BiCMOS attenuator/amplifier/
error amplifier with an alarm circuit designed to interface
with 50I systems operating in the 700MHz to 2700MHz
frequency range. The device features a gain range of
+18.1dB to -22.3dB, a noise figure of 5.2dB, OIP3 linear­
ity of +32.5dBm, and a wide RF bandwidth. Each of these
features makes the device an ideal VGA for numerous
receiver and transmitter applications. When paired with
the MAX2091 or MAX2091B variable gain upconverter, a
complete 2-chip IF-RF signal conditioning solution is possible for microwave point-to-point transmitters.
The MAX2092 operates from a single +5V supply, and
is available in a compact 20-pin TQFN pack­age (5mm
x 5mm) with an exposed pad. Electrical per­formance is
guaranteed over the extended temperature range from
TC = -40NC to +95NC.
Applications
Microwave Point-to-Point Receivers and
Transmitters
Features
SWide Band Coverage
700MHz to 2700MHz RF Frequency Range
SHigh Linearity
+32.5dBm OIP3
+18.2dBm Output -1dB Compression Point
S 18.1dB Gain
S 40.4dB Attenuation Range
S 5.2dB Noise Figure (Includes Attenuator
Insertion Loss)
S 0.03dB Gain Variation over 100MHz Bandwidth at
1835MHz
S Analog Attenuator Controlled with External
Voltage
S Extended +4.75V to +5.8V Supply Range
S Lead(Pb)-Free Package
S Power-Down Capabilities
Ordering Information appears at end of data sheet.
RF Variable-Gain Stages
Temperature Compensation Circuits
Cellular Applications
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX2092.related.
WiMAX® Applications
LTE Applications
Fixed Broadband Wireless Access
Wireless Local Loop
Military Systems
WiMAX is a registered certification mark and registered service
mark of WiMAX Forum.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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1
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
ABSOLUTE MAXIMUM RATINGS
VCC_RF, VCC_A.........................................................-0.3V to +6V
RF_OUT, RF_IN......................................... -0.3V to (VCC + 0.3V)
R_BIAS, CTRL1, CTRL2,
PLVLSET, DET_VIN.... -0.3V to Minimum (VCC + 0.3V, +3.6V)
RF_IN Input Power......................................................... +15dBm
RF_OUT Output Power................................................... +23dBm
Continuous Power Dissipation (Note 1) ..............................2.5W
Operating Case Temperature
Range (Note 2)................................................ -40NC to +95NC
Maximum Junction Temperature......................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow)..................................... +260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Note 1: Based on junction temperature TJ = TC + (BJC x VCC x ICC). This formula can be used when the temperature of the
exposed pad is known while the device is soldered down to a PCB. See the Applications Information section for details.
The junction temperature must not exceed +150NC.
Note 2: TC is the temperature on the exposed pad of the package. TA is the ambient temperature of the device and PCB.
PACKAGE THERMAL CHARACTERISTICS
Junction-to-Ambient Thermal Resistance (qJA)
(Notes 3, 4).................................................................. 32°C/W
Junction-to-Case Thermal Resistance (qJC)
(Notes 1, 4).................................................................... 7°C/W
Note 3: Junction temperature TJ = TA + (qJA x VCC x ICC). This formula can be used when the ambient temperature of the PCB is
known. The junction temperature must not exceed +150NC.
Note 4: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit with VCC = 4.75V to 5.8V, VGND = 0V, and TC = -40°C to +95°C. Typical values are at VCC = 5.5V and
TC = +25°C, unless otherwise noted.) (Note 5)
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
Total Supply Current
IDC
MIN
TYP
MAX
UNITS
5.8
V
4.75
VCC
Power down: CTRL1 = 0, CTRL2 = 0
2
3
VGA-only mode: CTRL1 = 1, CTRL2 = 0
80
90
ALC mode: CTRL1 = 1, CTRL2 = 1
93
110
mA
CTRL1/CTRL2 Logic-Low Input
Voltage
VIL
CTRL1, CTRL2 Logic-High Input
Voltage
VIH
2.2
IIH, IIL
-1
+1
µA
PLVLSET Input-Voltage Range
VIN
0
2.5
V
DET_VIN Input-Voltage Range
VIN
0
2.5
V
Input Logic Current
0.8
V
V
2
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
RECOMMENDED AC ELECTRICAL CHARACTERISTICS
PARAMETER
RF Frequency
SYMBOL
fRF
CONDITIONS
(Note 6)
MIN
TYP
700
MAX
UNITS
2700
MHz
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit with analog attenuator set for maximum gain, VCC = 4.75V to 5.8V, fRF = 1835MHz, PRFIN = -16dBm
(CW), TC = -40°C to +95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at
TC = +25°C, VCC = 5.5V, PRF_IN = -16dBm, VPLVLSET = 2.5V, CTRL1 = 1, CTRL2 = 0. Min/max specifications apply over supply,
process, and temperature, unless otherwise noted.) (Notes 5, 7)
PARAMETER
Small-Signal Gain
SYMBOL
G
CONDITIONS
MIN
17.3
fRF = 1835MHz
18.1
18.1
-0.007
0.22
0.03
0.03
0.03
fRF = 2200MHz
Gain vs. Temperature
974MHz ±50MHz
1835MHz ±50MHz
1835MHz ±80MHz
Gain Flatness vs. Frequency
1835MHz ±100MHz
Noise Figure
NF
Total Attenuation Range
TYP
fRF = 974MHz
2200MHz ±100MHz
0.1
fRF = 974MHz
5.0
fRF = 1835MHz
5.2
fRF = 2200MHz
5.5
fRF = 974MHz
40.1
fRF = 1835MHz
40.4
fRF = 2200MHz
39.2
Output Second-Order Intercept
Point
OIP2
PRFOUT = +2dBm/tone,
Df = 1MHz, f1+ f2
Output Third-Order Intercept
Point
OIP3
PRFOUT =
+2dBm/tone,
Df = 1MHz
Output -1dB Compression Point
P-1dB
MAX
dB
dB/°C
dBP-P
dB
dB
50
fRF = 974MHz
34.3
fRF = 1835MHz
32.5
fRF = 2200MHz
31.4
(Note 8)
UNITS
dBm
dBm
18.2
dBm
Second Harmonic
PRFOUT = +5dBm
52
dBc
Third Harmonic
PRFOUT = +5dBm
61
dBc
Input Return Loss
1835MHz ±50MHz
18
dB
Output Return Loss
1835MHz ±50MHz
23
dB
ALARM CIRCUIT (CTRL1 = 1 CTRL2 = 1)
Lower Alarm Threshold
Input = DET_VIN
0.175
V
Upper Alarm Threshold
Input = DET_VIN
2.25
V
29
mV
Hysteresis
Alarm Output Logic 1
Output = ALM
Alarm Output Logic 0
Output = ALM
3.135
3.3
3.465
V
0.4
V
3
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit with analog attenuator set for maximum gain, VCC = 4.75V to 5.8V, fRF = 1835MHz, PRFIN = -16dBm
(CW), TC = -40°C to +95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at
TC = +25°C, VCC = 5.5V, PRF_IN = -16dBm, VPLVLSET = 2.5V, CTRL1 = 1, CTRL2 = 0. Min/max specifications apply over supply,
process, and temperature, unless otherwise noted.) (Notes 5, 7)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG ATTENUATOR (CTRL1 = 1, CTRL2 = 0)
Minimum Attenuator Control
Voltage
Input = PLVLSET
0.25
V
Maximum Attenuator Control
Voltage
Input = PLVLSET
2.3
V
Average Gain-Control Slope
VPLVLSET = 0.25V to 2.3V
19.4
dB/V
Maximum Gain-Control Slope
VPLVLSET = 0V to 2.5V
27
dB/V
Note 5: Production tested at TC = +95°C. All other temperatures guaranteed by design and characterization.
Note 6: Recommended functional range, not production tested. Operation outside this range is possible, but with degraded
performance of some parameters.
Note 7: All limits include external component losses. Output measurements are taken at the RF port of the Typical Application
Circuit.
Note 8: It is advisable not to continuously operate the VGA RF-input above +12dBm.
Typical Operating Characteristics
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = -16dBm, TC = -40°C to
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at TC = +25°C, VCC = 5.5V,
PRF = -16dBm, CTRL1 = 1, CTRL2 = 0, VPLVLSET = 2.5V, unless otherwise noted.)
TC = +25°C
20
VCC = 4.75V, 5.00V, 5.50V, 5.80V
16
GAIN (dB)
GAIN (dB)
TC = +95°C
2.5V
15
18
GAIN (dB)
18
25
1.0V
-5
16
0.5V
-15
14
1200
1700
2200
RF FREQUENCY (MHz)
2700
0V
-25
14
700
1.5V
2.0V
5
MAX2092 toc03
TC = -40°C
MAX2092 toc01
20
GAIN OVER VPLVLSET SETTING
vs. RF FREQUENCY
GAIN vs. RF FREQUENCY
MAX2092 toc02
GAIN vs. RF FREQUENCY
700
1200
1700
2200
RF FREQUENCY (MHz)
2700
700
1200
1700
2200
2700
RF FREQUENCY (MHz)
4
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = -16dBm, TC = -40°C to
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at TC = +25°C, VCC = 5.5V,
PRF = -16dBm, CTRL1 = 1, CTRL2 = 0, VPLVLSET = 2.5V, unless otherwise noted.)
-5
2700MHz
700MHz
-10
-20
TC = +25°C
2200MHz
-20
-30
-15
1835MHz
TC = +95°C
974MHz
700MHz, 974MHz, 1835MHz, 2200MHz
0.5
1.0
1.5
2.0
700
1200
1700
2200
2.0
2.5
S22 vs. VPLVLSET SETTING
REVERSE-ISOLATION OVER VPLVLSET
SETTING vs. RF FREQUENCY
2700MHz
2200MHz
70
-20
974MHz
TC = +25°C
-30
2200
0
2700
0.5
1.0
1.5
2.0
GAIN vs. VPLVLSET SETTING
fRF = 1835MHz
15
fRF = 974MHz
15
GAIN (dB)
-5
-15
1200
TC = -40°C, +25°C, +95°C
5
-25
-5
2.5
2200
2700
25
fRF = 700MHz
15
TC = -40°C, +25°C, +95°C
5
-5
-15
-25
2.0
1700
GAIN vs. VPLVLSET SETTING
-15
VPLVLSET (V)
700
GAIN vs. VPLVLSET SETTING
TC = -40°C, +25°C, +95°C
1.5
VPLVLSET = 2.5V
RF FREQUENCY (MHz)
25
MAX2092 toc10
25
1.0
40
VPLVLSET (V)
RF FREQUENCY (MHz)
0.5
VPLVLSET = 0V
20
2.5
GAIN (dB)
1700
MAX2092 toc11
1200
50
30
1835MHz
-40
60
MAX2092 toc12
S22 (dB)
700MHz
-30
80
MAX2092 toc09
0
MAX2092 toc07
TC = +95°C
-20
0
1.5
S22 vs. RF FREQUENCY
-10
5
1.0
VPLVLSET (V)
TC = -40°C
700
0.5
0
2700
RF FREQUENCY (MHz)
0
-10
2.5
VPLVLSET (V)
REVERSE-ISOLATION (dB)
0
-30
-40
MAX2092 toc08
-25
GAIN (dB)
2700MHz
TC = -40°C
S11 (dB)
5
0
MAX2092 toc05
MAX2092 toc04
-10
S11 (dB)
GAIN (dB)
15
S22 (dB)
S11 vs. VPLVLSET SETTING
S11 vs. RF FREQUENCY
0
MAX2092 toc06
GAIN vs. VPLVLSET SETTING
25
-25
0
0.5
1.0
1.5
VPLVLSET (V)
2.0
2.5
0
0.5
1.0
1.5
2.0
2.5
VPLVLSET (V)
5
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = -16dBm, TC = -40°C to
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at TC = +25°C, VCC = 5.5V,
PRF = -16dBm, CTRL1 = 1, CTRL2 = 0, VPLVLSET = 2.5V, unless otherwise noted.)
GAIN vs. VPLVLSET SETTING
15
-5
TC = -40°C, +25°C, +95°C
5
-5
-15
-15
-25
-25
TC = +95°C
7
NOISE FIGURE (dB)
TC = -40°C, +25°C, +95°C
5
fRF = 2700MHz
GAIN (dB)
GAIN (dB)
15
8
MAX2092 toc14
MAX2092 toc13
fRF = 2200MHz
NOISE FIGURE vs. RF FREQUENCY
25
MAX2092 toc15
GAIN vs. VPLVLSET SETTING
25
6
TC = +25°C
5
4
TC = -40°C
2.0
2.5
0.5
0
1.0
VPLVLSET (V)
NOISE FIGURE vs. RF FREQUENCY
700
MAX2092 toc16
5
TC = -40°C
35
TC = +95°C
35
VCC = 5.50V
VCC = 5.80V
30
VCC = 4.75V
VCC = 5.00V
25
1700
2200
25
700
2700
1200
1700
2200
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
OUTPUT IP3 vs. VPLVLSET SETTING
(CONSTANT POUT)
OUTPUT IP3 vs. VPLVLSET SETTING
(CONSTANT PIN)
37
35
33
31
TC = +95°C LSB
35
TC = +25°C LSB, USB
29
31
TC = +25°C LSB, USB
TC = +95°C USB
27
1.7
VPLVLSET (V)
2200
2700
20
TC = -40°C
19
18
TC = +25°C
17
TC = +95°C
16
27
1.3
1700
TC = +95°C LSB
TC = +95°C USB
0.9
1200
OUTPUT P1dB vs. RF FREQUENCY
33
29
700
RF FREQUENCY (MHz)
fRF = 1835MHz
PIN = -6dBm / TONE
TC = -40°C LSB, USB
OUTPUT IP3 (dBm)
fRF = 1835MHz
POUT = 2dBm / TONE
TC = -40°C LSB, USB
37
2700
OUTPUT P1dB (dBm)
1200
MAX2092 toc19
700
MAX2092 toc20
3
2700
POUT = 2dBm/ TONE
TC = +25°C
4
2200
OUTPUT IP3 vs. RF FREQUENCY
POUT = 2dBm/ TONE
30
1700
40
OUTPUT IP3 (dBm)
VCC = 4.75V, 5.00V, 5.50V, 5.80V
1200
RF FREQUENCY (MHz)
40
OUTPUT IP3 (dBm)
NOISE FIGURE (dB)
3
2.5
OUTPUT IP3 vs. RF FREQUENCY
7
OUTPUT IP3 (dBm)
2.0
VPLVLSET (V)
8
6
1.5
MAX2092 toc18
1.5
MAX2092 toc21
1.0
MAX2092 toc17
0.5
0
2.1
2.5
0.9
1.3
1.7
VPLVLSET (V)
2.1
2.5
15
700
1200
1700
2200
2700
RF FREQUENCY (MHz)
6
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = -16dBm, TC = -40°C to
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at TC = +25°C, VCC = 5.5V,
PRF = -16dBm, CTRL1 = 1, CTRL2 = 0, VPLVLSET = 2.5V, unless otherwise noted.)
45
VCC = 5.25V
16
1200
1700
2200
35
1200
700
2700
1700
2200
2nd HARMONIC vs. VPLVLSET SETTING
(CONSTANT POUT)
2nd HARMONIC vs. VPLVLSET SETTING
(CONSTANT PIN)
MAX2092 toc25
45
TC = +25°C
fRF = 1835MHz
PIN = -6dBm
80
2nd HARMONIC (dBc)
TC = -40°C
55
TC = +95°C
TC = +25°C
60
50
35
1.3
1.7
2.1
2.5
1.25
1.50
TC = -40°C
60
TC = +25°C
TC = +95°C
40
1.75
700
1200
1700
2200
2700
VPLVLSET (V)
VPLVLSET (V)
RF FREQUENCY (MHz)
3rd HARMONIC vs. RF FREQUENCY
3rd HARMONIC vs. VPLVLSET SETTING
(CONSTANT POUT)
3rd HARMONIC vs. VPLVLSET SETTING
(CONSTANT PIN)
80
3rd HARMONIC (dBc)
VCC = 4.75V, 5.00V, 5.50V, 5.80V
fRF = 1835MHz
POUT = 5dBm
60
TC = -40°C
70
60
TC = +95°C
110
TC = +25°C
fRF = 1835MHz
PIN = -6dBm
100
3rd HARMONIC (dBc)
POUT = 5dBm
MAX2092 toc28
80
70
1.00
70
50
TC = +95°C
0.75
2700
POUT = 5dBm
40
0.9
2200
3rd HARMONIC vs. RF FREQUENCY
TC = -40°C
70
1700
80
3rd HARMONIC (dBc)
fRF = 1835MHz
POUT = 5dBm
1200
RF FREQUENCY (MHz)
MAX2092 toc26
RF FREQUENCY (MHz)
90
700
2700
RF FREQUENCY (MHz)
65
2nd HARMONIC (dBc)
VCC = 5.80V
35
15
700
VCC = 5.50V
45
TC = +25°C
VCC = 5.00V
3rd HARMONIC (dBc)
TC = +95°C
55
90
TC = -40°C
80
TC = +25°C
70
TC = +95°C
50
50
MAX2092 toc27
VCC = 4.75V
55
VCC = 5.00V
MAX2092 toc29
17
TC = -40°C
VCC = 4.75V
POUT = 5dBm
MAX2092 toc30
18
POUT = 5dBm
2nd HARMONIC (dBc)
2nd HARMONIC (dBc)
OUTPUT P1dB (dBm)
VCC = 5.50V
2nd HARMONIC vs. RF FREQUENCY
65
MAX2092 toc23
MAX2092 toc22
VCC = 5.80V
19
65
MAX2092 toc24
2nd HARMONIC vs. RF FREQUENCY
OUTPUT P1dB vs. RF FREQUENCY
20
60
50
40
40
700
1200
1700
2200
RF FREQUENCY (MHz)
2700
0.9
1.3
1.7
VPLVLSET (V)
2.1
2.5
0.75
1.00
1.25
1.50
1.75
VPLVLSET (V)
7
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = -16dBm, TC = -40°C to
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at TC = +25°C, VCC = 5.5V,
PRF = -16dBm, CTRL1 = 1, CTRL2 = 0, VPLVLSET = 2.5V, unless otherwise noted.)
OIP2 vs. RF FREQUENCY
MAX2092 toc31
POUT = 2dBm / TONE
65
VCC = 4.75V
POUT = 2dBm/ TONE
TC = -40°C
MAX2092 toc32
OIP2 vs. RF FREQUENCY
65
VCC = 5.00V
55
OIP2 (dBm)
OIP2 (dBm)
55
TC = +25°C
45
45
VCC = 5.50V
TC = +95°C
VCC = 5.80V
35
35
1700
2200
700
2700
1200
1700
2200
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
OIP2 vs. VPLVLSET SETTING
(CONSTANT POUT)
OIP2 vs. VPLVLSET SETTING
(CONSTANT PIN)
fRF = 1835MHz
POUT = 2dBm/ TONE
65
TC = -40°C
fRF = 1835MHz
PIN = -6dBm/ TONE
TC = -40°C
OIP2 (dBm)
55
OIP2 (dBm)
55
2700
MAX2092 toc34
65
1200
MAX2092 toc33
700
45
45
TC = +25°C
TC = +25°C
TC = +95°C
35
TC = +95°C
35
0.9
1.3
1.7
VPLVLSET (V)
2.1
2.5
0.75
1.00
1.25
1.50
1.75
VPLVLSET (V)
8
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
GND
GND
RF_OUT
VCC_RF
TOP VIEW
GND
Pin Configuration
15
14
13
12
11
GND 16
10
CTRL2
GND 17
9
GND
8
DET_VIN
7
GND
6
AMP_OUT
MAX2092
GND 18
GND 19
3
4
5
PLVLSET
ALM
2
VCC_A
1
R_BIAS
+
CTRL1
RF_IN 20
TQFN
Pin Description
PIN
NAME
FUNCTION
1
CTRL1
2
R_BIAS
Bias Resistor Setting Input. Connect a resistor from this pin to ground.
3
VCC_A
Power-Supply Input. Bypass to ground with a 0.01FF capacitor as close as possible to the pin.
4
PLVLSET
Output-Power Level-Setting DC Input or Analog Attenuator Control Voltage
5
ALM
AMP_OUT
Alarm Logic Output
6
7, 13-19
GND
8
DET_VIN
9
GND
10
CTRL2
Control-Mode Logic Input 2 (3.3V Logic)
11
V­CC_RF
Driver-Amplifier Supply Voltage Input. Bypass to ground with a 0.01FF capacitor as close as
possible to the pin.
12
RF_OUT
Driver-Amplifier Output (50I). Requires a DC-blocking capacitor.
20
RF_IN
—
EP
Control-Mode Logic Input 1 (3.3V Logic)
Error-Amplifier Output
Ground
Error-Amplifier Input Voltage from an External Detector
Do not directly connect to EP. Connect to RF ground plane with a short trace using a
separate via hole.
Attenuator Input (50I). Requires a DC-blocking capacitor.
Exposed Pad. Internally connected to GND. Solder the exposed pad to a PCB pad that uses
multiple ground vias to provide heat transfer out of the device into the PCB ground planes. These
multiple via grounds are also required to achieve the noted RF performance. See the Layout
Considerations section.
9
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Detailed Description
recommended, but the device operates with any detector whose output ranges from 0V DC to 2.5V DC (output
coupler at RF_OUT already taken into account). An error
amplifier compares the DET_VIN voltage to PLVLSET,
and drives the attenuator in servo fashion until the erroramplifier’s differential input error voltage is near zero. The
servo loop acts to maintain a regulated output power level
over an input power range depending on the setting of
PLVLSET.
The MAX2092 is a high-linearity analog VGA designed
to interface with 50Ω systems operating in the 700MHz
to 2700MHz frequency range. The analog attenuator is
controlled by an external analog control voltage. The
device features a gain range of 18.1dB to -22.3dB, a
noise figure of 5.2dB, OIP3 linearity of +32.5dBm, and
a wide RF bandwidth. Each of these features makes the
device an ideal VGA for numerous receiver and transmitter applications. In addition, the device operates from a
single +5V supply.
When used in conjunction with the MAX2091 IF VGA, it
is recommended that an external voltage of 1.65V be
applied to the IF PLVLSET. This ensures that a nominal
RF signal level of approximately -3dBm is output from the
MAX2091. With this specific level setting, the complete
MAX2091 + MAX2092 cascade yields a constant RF
output power of -20.5dBm to +5dBm (depending on the
setting of RF PLVLSET) over an IF input power range of
–24dBm to +1dBm. See Figure 1 for details. Contact
the factory for additional details surrounding Maxim’s
MAX2091 + MAX2092 reference design.
Applications Information
Modes of Operation
The device can operate in several different modes, as
summarized in Table 1.
VGA-Only Mode Operation
VGA-only mode operation consists of setting CTRL1 =
logic 1 and CTRL2 = logic 0, and applying a DC value to
PLVLSET between 0V and 2.5V DC to manually adjust the
attenuation, and subsequently the RF_OUT power to any
desired value. The output power at RF_OUT increases at
a rate of 19.4dB/V as PLVLSET is increased. In VGA-only
mode, operation components R5, R6, R7, and C8–C11 can
be left unpopulated, and CTRL2 needs to be tied directly
to ground.
Control Inputs
The device has three control inputs: CTRL1, CTRL2,
and PLVLSET. VCC must be present before voltages are
applied to these pins. In cases where this is not possible, a 200Ω resistor must be included in series with
the control inputs to limit on-chip ESD diode conduction.
CTRL1 and CTRL2 are 3V logic controls, and cannot be
driven from 5V logic. In the case where no logic control
is available and a logic high is required, a voltage divider
can be used from the 5V VCC supply to produce the 3V
logic-high.
Closed-ALC Mode Operation
Closed-ALC mode operation consists of setting CTRL1
= CTRL2 = logic 1. The voltage on PLVLSET is set externally to adjust output power from -20dBm to +5dBm
when input power is in the recommended power range,
typically -6dBm. See the Typical Application Circuit. As
PLVLSET increases, the output power also increases at a
rate set by the external detector chosen. Ideally, a detector with an output voltage range of 0.1V DC to 2.4V DC is
Alarm Operation
The alarm remains in logic-high state when the voltage
on DET_VIN (pin 8) is within the 0.175V to 2.25V range.
The alarm threshold amount is an internal fixed value to
the device with a nominal hysteresis of approximately
29mV.
Table 1. Control Mode Logic
CTRL1
CTRL2
VGA
ALC LOOP
ALARM
FUNCTIONAL DESCRIPTION
0
0
Disabled
Disabled
Disabled
Power-Down Mode
1
0
Enabled
Disabled
Disabled
VGA-Only Mode
1
1
Enabled
Enabled
Enabled
Closed ALC Mode. ALC loop locks DET_VIN to
PLVLSET.
0
1
—
—
—
Factory Test Mode (Do Not Use)
10
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
2.5dB PAD
40dB
38dB
IF_IN
-24dBm
TO +1dBm
RF_OUT
-20.5dBm
TO +5dBm
MAX2092
MAX2091
LO
ALARM
THRESHOLDS
IF
ALARM
OUT
IF PLVLSET
(ANALOG CONTROL)
INPUT
FROM
EXTERNAL
DETECTOR
ALARM
THRESHOLD
RF PLVLSET
(ANALOG CONTROL)
RF
ALARM
OUT
INPUT
FROM EXTERNAL
DETECTOR
Figure 1. Cascaded IF-RF Lineup Using the MAX2091 + MAX2092
DET_VIN
In closed ALC-loop mode, avoid directly loading pins
AMP_OUT and DET_VIN with capacitance in excess of
10pF on each pin. In closed ALC-loop mode, this can
cause ringing or instability in the power-control loop.
As in any closed-loop system, one must be careful not
to load DET_VIN or AMP_OUT with additional external
circuitry. Therefore, it is suggested that in the closedloop ALC mode, no additional connections be made to
DET_VIN or AMP_OUT. AMP_OUT and DET_VIN support
a total trace routing capacitance of 10pF or less. Connect
pin 9 to the RF ground plane with a via separated from
the exposed pad (EP) ground connection. Pin 9 must
not connect to the exposed pad or share a ground with
any other component, and must connect directly to the
solid ground plane below. As a reference, refer to the
MAX2092EVKIT+ PCB artwork.
Layout Considerations
The pin configuration of the MAX2092 is optimized to
facilitate a very compact physical layout of the device
and its associated discrete components. The exposed
pad of the device’s 20-pin TQFN-EP package provides a
low thermal-resistance path to the die. It is important that
the PCB on which the device is mounted be designed to
conduct heat from the EP. In addition, provide the EP with
a low inductance path to electrical ground. The EP MUST
be soldered to a ground plane on the PCB, either directly
or through an array of plated via holes. Pin 9 must not
connect to the exposed pad or share a ground with any
other component and must connect directly to the solid
ground plane below.
11
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Table 2. Typical Application Circuit Component Values
MODE OF OPERATION
COMPONENT
VALUE
SIZE
VENDOR
DESCRIPTION
ü
12pF
0402
Murata
C0G dielectric
ü
0.01FF
0402
Murata
X7R dielectric
ü
8.2pF
0402
Murata
C0G dielectric
ü
100nF
0603
Murata
X7R dielectric
VGA ONLY
CLOSED
ALC
C1
ü
C2, C3
ü
C5
ü
C8
—
C9
—
ü
680pF
0402
Murata
C0G dielectric
C10
—
ü
120pF
0402
Murata
C0G dielectric
C11
—
ü
120pF
0402
Murata
C0G dielectric
C14*
—
—
Do not install
0402
—
—
R1
ü
ü
1.78kI
0402
Panasonic
1% tolerance
R5
—
ü
200I
0402
Panasonic
1% tolerance
R6
—
ü
51I
0402
Panasonic
5% tolerance
R7
—
ü
10kI
0402
Panasonic
5% tolerance
R11*
ü
ü
0I
0402
Panasonic
5% tolerance
U1
ü
ü
—
20-pin TQFN
(5mm x 5mm)
Maxim
MAX2092ETP+
Note: The checkmarks in the Mode of Operation columns indicate that the component is used within each respective application.
*C14 and R11 form an optional lowpass network to filter out potential noise from the the external PLVLSET control source.
12
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Application Circuit
RF_OUT
VCC
15
GND
14
13
C3
VCC_RF
RF_OUT
GND
GND
GND
C5
12
11
10
16
CTRL2
R6
CTRL2
C10
MAX2092
GND
GND
GND
C1
RF_IN
9
18
8
19
7
20
6
VLOW VHIGH
GND*
DET_VIN
R7
DET_IN
GND
AMP_OUT
C8
R5
C9
3
VCC_A
R1
4
5
ALM
2
PLVLSET
1
R_BIAS
+
CTRL1
RF_IN
EP
17
VCC
C11
C2
R11
C14
*SEE PIN DESCRIPTION
13
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Package Information
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2092ETP+
-40NC to +95NC
20 TQFN-EP*
MAX2092ETP+T
-40NC to +95NC
20 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
*T = Tape and reel.
Chip Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
20 TQFN
T2055+3
21-0140
90-0008
PROCESS: SiGe BiCMOS
14
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/12
DESCRIPTION
Initial release
PAGES
CHANGED
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2012
www.BDTIC.com/maxim
Maxim Integrated Products 15
Maxim is a registered trademark of Maxim Integrated Products, Inc.