Download MAX2090 50MHz to 1000MHz Analog VGA with Threshold General Description

MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
General Description
The MAX2090 high-linearity analog variable-gain amplifier (VGA) is a monolithic SiGe BiCMOS attenuator,
amplifier, error amplifier, and alarm circuit, designed to
interface with 50I systems operating in the 50MHz to
1000MHz frequency range. An external analog control
voltage controls the analog attenuator. The device features a gain range of -10.9dB to +26.1dB, a noise figure
of 4dB, OIP3 linearity of +38dBm, 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 +5.0V supply.
This device 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
Point-to-Point Receivers and Transmitters
Benefits and Features
SWideband Coverage
50MHz to 1000MHz RF Frequency Range
SHigh Linearity
+38dBm OIP3 (100MHz)
+17.5dBm Output -1dB Compression Point (100MHz)
S26.1dB Gain
S37dB Attenuator Range
S4dB Noise Figure (Includes Attenuator Insertion
Loss)
S0.25dB Gain Variation Over 100MHz Bandwidth
SAnalog Attenuator Controlled with External
Voltage
SAlarm Circuit with Adjustable Threshold
SExtended +4.75V to +5.8V Supply Range
SLead(Pb)-Free Package
SPower-Down Capabilities
RF/IF Variable-Gain Stages
Temperature-Compensation Circuits
Ordering Information appears at end of data sheet.
Cellular Applications
WiMAX™ Applications
LTE Applications
Fixed Broadband Wireless Access
Wireless Local Loop
Military Systems
WiMAX is a trademark of WiMAX Forum.
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX2090.related
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
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19-6034; Rev 1; 9/12
MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
ABSOLUTE MAXIMUM RATINGS
VCC_A, VCC_RF.........................................................-0.3V to +6V
RF_IN, RF_OUT......................................... -0.3V to (VCC + 0.3V)
R_BIAS, ALM_THRES, PLVLSET,
AMP OUT...........................................................-0.3V to +3.6V
CTRL1, CTRL2......................................................-0.3V to +3.6V
ALM.......................................................................-0.3V to +3.6V
DET_VIN ...............................................................-0.3V to +3.6V
RF_IN Input Power......................................................... +15dBm
RF_OUT Output Power .................................................. +20dBm
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
Note 1: Based on junction temperature TJ = TC + (qJC 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.
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.
PACKAGE THERMAL CHARACTERISTICS
TQFN
Junction-to-Ambient Thermal Resistance qJA (Notes 3, 4)...+29NC/W
Junction-to-Case Thermal Resistance qJC (Notes 1, 4)..........7NC/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 four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, VCC = 4.75V to 5.8V, VGND = 0V, and TC = -40NC to +95NC. Typical values are at VCC = 5.5V,
VPLVLSET = 2.5V, and TC = +25NC, unless otherwise noted.) (Note 5)
PARAMETER
SYMBOL
Supply Voltage
VCC
Total Supply Current
IDC
CONDITIONS
MIN
TYP
MAX
UNITS
4.75
5.0
5.8
V
CTRL1 = 1, CTRL2 = 1
81
110
CTRL1 = 1, CTRL2 = 0
71
100
CTRL1 = 0, CTRL2 = 0
5.7
15
CTRL1/CTRL2 Logic-Low Input
Voltage
VIL
CTRL1/CTRL2 Logic-High Input
Voltage
VIH
2.2
CTRL1/CTRL2 Input Logic
Current
IIH, IIL
-10
PLVLSET Input Resistance
RIN
650
0.8
PLVLSET Input Voltage Range
0
PLVLSET Minimum Control
Voltage
0
mA
V
V
+10
FA
kI
0.1
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2.5
V
0.2
V
2
MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, VCC = 4.75V to 5.8V, VGND = 0V, and TC = -40NC to +95NC. Typical values are at VCC = 5.5V,
VPLVLSET = 2.5V, and TC = +25NC, unless otherwise noted.) (Note 5)
MIN
TYP
MAX
UNITS
PLVLSET Maximum Control
Voltage
PARAMETER
SYMBOL
2.3
2.4
2.5
V
ALM_THRES Input Resistance
90
135
ALM_THRES Input Voltage
Range
CONDITIONS
(Note 6)
kI
0
ALM Output Logic 1
3.135
3.3
2.5
V
3.465
V
0.4
V
ALM Output Logic 0
DET_VIN Input Resistance
175
235
295
kI
MIN
TYP
MAX
UNITS
1000
MHz
RECOMMENDED AC OPERATING CONDITIONS
PARAMETER
RF Frequency
SYMBOL
fRF
CONDITIONS
(Note 7)
50
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = 350MHz, TC = -40NC
to +95NC, and RF ports are connected to 50I sources, unless otherwise noted. Typical values are at TC = +25NC, VCC = 5.5V,
PRF_IN = -25dBm, VPLVLSET = 2.5V, CTRL1 = 1, CTRL2 = 0. Min/max specifications apply over supply, process, and temperature,
unless otherwise noted.) (Note 8)
PARAMETER
Small-Signal Gain
SYMBOL
G
MIN
TYP
TC = +25NC, VCC = 5.0V (Note 6)
CONDITIONS
24.5
26.1
(Note 5)
23.5
26.1
Gain vs. Temperature
NF
0.25
fRF Q80MHz
0.4
fRF Q100MHz
0.5
(Note 6)
VPLVLSET = 0.2V to 2.5V (Note 5)
Total Attenuation Range
Group-Delay Variation
Output Third-Order Intercept
Point (Note 6)
fRF Q50MHz
OIP3
4
35
37
Within Q50MHz
150
Within Q80MHz
250
Within Q100MHz
300
VPLVLSET = 2.5V, PRF_OUT = 0dBm/tone,
fRF2 - fRF1 = 1MHz
31.8
VPLVLSET = 0.7V, PRF_OUT = 0dBm/tone,
fRF2 - fRF1 = 1MHz
31.8
UNITS
dB
-0.004
Maximum Gain Variation vs.
Frequency
Noise Figure
MAX
dB/NC
dB
5.7
dB
dB
ps
37.6
dBm
37.6
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MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit with analog attenuator set to minimum attenuation, VCC = 4.75V to 5.8V, fRF = 350MHz, TC = -40NC
to +95NC, and RF ports are connected to 50I sources, unless otherwise noted. Typical values are at TC = +25NC, VCC = 5.5V,
PRF_IN = -25dBm, VPLVLSET = 2.5V, CTRL1 = 1, CTRL2 = 0. Min/max specifications apply over supply, process, and temperature,
unless otherwise noted.) (Note 8)
PARAMETER
Output Second-Order Intercept
Point
SYMBOL
OIP2
Output Second Harmonic
Output Third Harmonic
Output -1dB Compression Point
CONDITIONS
MIN
MAX
UNITS
PRF_OUT = 0dBm/tone,
fRF2 - fRF1 = 1MHz,
fRF_OUT = fRF2 + fRF1
59.3
dBm
PRF_OUT = 0dBm
65.4
dBc
PRF_OUT = 0dBm
P1dB
TYP
(Note 9)
Average Gain-Control Slope
VPLVLSET = 0.5V to 2.0V (Note 6)
Maximum Gain-Control Slope
VPLVLSET = 0 to 2.5V
80.5
dBc
14
17.6
dBm
16.5
19.5
VGA Reverse Isolation
23.0
dB/V
25
dB/V
35
dB
PRF_IN = -15dBm, VPLVLSET = 2.5V to 1.2V,
output settled within Q0.5dB of final value
330
PRF_IN = -15dBm, VPLVLSET =1.2V to 2.5V,
output settled within Q0.5dB final value
220
Insertion Phase Change
VPLVLSET = 2.5V to 0V
11
Degrees
RF_IN Return Loss
ZS = 50I, over full attenuation range
(Note 6)
13.5
20
dB
RF_OUT Return Loss
ZL = 50I over full attenuation range
(Note 6)
13.5
20
dB
Attenuator Response Time
ns
ERROR AMPLIFIER AND ALARM CIRCUIT (CTRL1 = CTRL2 = 1)
Maximum AMP_OUT
Capacitance to GND
(Note 7)
ALM Threshold
ALM_THRES open (Input = DET_VIN)
20
pF
1.35
V
Note 5: Production tested and guaranteed at TC = +95NC for worst-case supply voltage. Performance at TC = +25NC and
TC = -40NC are guaranteed by design and characterization for worst-case supply voltage.
Note 6: Guaranteed by design and characterization.
Note 7: Recommended functional range. Not production tested. Operation outside this range is possible, but with degraded
performance of some parameters.
Note 8: All limits include external component losses. Output measurements were taken at the RF_OUT port.
Note 9: It is advisable not to continuously operate the RF_IN input power above 11dBm, and RF_OUT power above 19dBm.
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MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics
(Typical Application Circuit with analog attenuator set to minimum attenuation (VPLVLSET = 2.5V), VCC = 5.5V, TC = +25NC, fRF_IN =
350MHz, PRF_IN = -25dBm, RSOURCE = RLOAD = 50I, CTRL1 = 1, CTRL2 = 0, ALM_THRES = ALM = open, unless otherwise noted.)
SUPPLY CURRENT vs. VCC
26
25
TC = +95°C
24
TC = -40°C
65
TC = +25°C
4.90
5.05
5.20
5.35
5.50
5.65
22
5.80
250
VCC (V)
650
850
1050
850
1050
2.0
2.5
fRF = 350MHz
20
TC = -40°C, +25°C, +95°C
10
1000MHz
350MHz, 500MHz
-10
-10
650
GAIN vs. VPLVLSET
50MHz
0
450
30
MAX2090 toc05
20
GAIN (dB)
0
10
0
-10
VPLVLSET INCREMENT = 0.25V
0V
50
250
GAIN vs. VPLVLSET
10
-20
50
RF FREQUENCY (MHz)
30
MAX2090 toc04
2.5V
20
GAIN (dB)
450
RF FREQUENCY (MHz)
GAIN OVER VPLVLSET
vs. RF FREQUENCY
30
24
22
50
GAIN (dB)
4.75
VCC = 4.75V, 5.00V, 5.50V, 5.80V
23
23
60
25
MAX2090 toc06
70
26
GAIN (dB)
TC = +25°C
MAX2090 toc03
TC = -40°C
27
GAIN vs. RF FREQUENCY
27
MAX2090 toc02
MAX2090 toc01
TC = +95°C
75
GAIN vs. RF FREQUENCY
28
GAIN (dB)
SUPPLY CURRENT (mA)
80
-20
250
450
650
RF FREQUENCY (MHz)
850
1050
-20
0
0.5
1.0
1.5
VPLVLSET (V)
2.0
2.5
0
0.5
1.0
1.5
VPLVLSET (V)
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MAX2090
50MHz to 1000MHz 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 (VPLVLSET = 2.5V), VCC = 5.5V, TC = +25NC, fRF_IN =
350MHz, PRF_IN = -25dBm, RSOURCE = RLOAD = 50I, CTRL1 = 1, CTRL2 = 0, ALM_THRES = ALM = open, unless otherwise noted.)
S22 (dB)
-10
-20
500MHz
-20
500MHz
-30
70
-30
1.5
2.0
2.5
0
0.5
VPLVLSET (V)
S21 PHASE CHANGE vs. VPLVLSET
REFERENCED TO
HIGH GAIN STATE
6
NOISE FIGURE (dB)
S21 PHASE CHANGE (DEG)
2.5
50
250
0
350MHz
-30
TC = +95°C
450
650
850
1050
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
500MHz
30
2.0
7
MAX2090 toc10
1000MHz
1.5
VPLVLSET (V)
90
60
1.0
NOISE FIGURE vs. RF FREQUENCY
7
TC = +25°C
6
NOISE FIGURE (dB)
1.0
40
20
MAX2090 toc11
0.5
VPLVLSET = 0V
VPLVLSET = 2.5V
-40
0
50
30
350MHz
-40
60
5
4
MAX2090 toc12
350MHz
1000MHz
MAX2090 toc09
50MHz
50MHz
80
MAX2090 toc08
1000MHz
-10
S11 (dB)
0
MAX2090 toc07
0
REVERSE ISOLATION OVER VPLVLSET
vs. RF FREQUENCY
OUTPUT MATCH vs. VPLVLSET
REVERSE ISOLATION (dB)
INPUT MATCH vs. VPLVLSET
VCC = 4.75V, 5.00V, 5.50V, 5.80V
5
4
50MHz
3
-60
3
TC = -40°C
POSITIVE PHASE = ELECTRICALLY SHORTER
-90
0
0.5
1.0
1.5
VPLVLSET (V)
2.0
2.5
2
2
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
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MAX2090
50MHz to 1000MHz 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 (VPLVLSET = 2.5V), VCC = 5.5V, TC = +25NC, fRF_IN =
350MHz, PRF_IN = -25dBm, RSOURCE = RLOAD = 50I, CTRL1 = 1, CTRL2 = 0, ALM_THRES = ALM = open, unless otherwise noted.)
OUTPUT P1dB vs. RF FREQUENCY
14
18
TC = -40°C
16
VCC = 5.00V
VCC = 4.75V
14
12
12
250
450
650
850
1050
50
250
RF FREQUENCY (MHz)
47
MAX2090 toc16
VCC = 5.50V
30
TC = -40°C LSB
POUT = 0dBm /TONE
fRF = 350MHz
37
RF FREQUENCY (MHz)
850
450
650
850
1050
90
POUT = 0dBm
80
TC = +25°C
70
60
TC = -40°C
TC = +95°C
TC = +25°C USB TC = +95°C USB
32
650
250
50
TC = +95°C LSB
VCC = 4.75V
450
50
2nd HARMONIC vs. RF FREQUENCY
42
VCC = 5.00V
250
TC = +95°C
RF FREQUENCY (MHz)
TC = +25°C LSB,
-40°C USB
OUTPUT IP3 (dBm)
VCC = 5.80V
50
25
1050
2nd HARMONIC (dBc)
POUT = 0dBm/TONE
OUTPUT IP3 (dBm)
850
30
OUTPUT IP3 vs. VPLVLSET
OUTPUT IP3 vs. RF FREQUENCY
25
650
TC = +25°C
RF FREQUENCY (MHz)
40
35
450
MAX2090 toc17
50
35
MAX2090 toc18
TC = +95°C
POUT = 0dBm /TONE
OUTPUT IP3 (dBm)
16
40
MAX2090 toc14
MAX2090 toc13
TC = +25°C
18
VCC = 5.50V, 5.80V
OUTPUT P1dB (dBm)
OUTPUT P1dB (dBm)
TC = -40°C
OUTPUT IP3 vs. RF FREQUENCY
20
MAX2090 toc15
OUTPUT P1dB vs. RF FREQUENCY
20
1050
0.65
1.02
1.39
1.76
VPLVLSET (V)
2.13
2.50
40
50
250
450
650
850
1050
RF FREQUENCY (MHz)
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MAX2090
50MHz to 1000MHz 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 (VPLVLSET = 2.5V), VCC = 5.5V, TC = +25NC, fRF_IN =
350MHz, PRF_IN = -25dBm, RSOURCE = RLOAD = 50I, CTRL1 = 1, CTRL2 = 0, ALM_THRES = ALM = open, unless otherwise noted.)
VCC = 5.50V
60
MAX2090 toc20
60
TC = +95°C
650
850
1050
60
0.65
1.02
1.39
RF FREQUENCY (MHz)
1.76
2.13
VPLVLSET (V)
POUT = 0dBm
fRF = 350MHz
100
3rd HARMONIC (dBc)
100
90
VCC = 4.75V, 5.00V, 5.50V, 5.80V
80
TC = +25°C
60
250
450
650
850
TC = +95°C
TC = +95°C
0.65
1050
1.02
1.39
1.76
2.13
40
2.50
250
MAX2090 toc25
70
POUT = 0dBm/TONE
fRF = 350MHz
60
OIP2 (dBm)
OIP2 (dBm)
VCC = 5.50V
50
650
RF FREQUENCY (MHz)
850
1050
TC = -40°C
50
VCC = 5.00V
VCC = 4.75V
450
850
TC = +25°C
VCC = 5.80V
250
650
OIP2 vs. VPLVLSET
POUT = 0dBm /TONE
60
450
RF FREQUENCY (MHz)
OIP2 vs. RF FREQUENCY
70
50
50
VPLVLSET (V)
RF FREQUENCY (MHz)
40
TC = -40°C
50
60
60
1050
POUT = 0dBm /TONE
80
70
70
850
70
TC = -40°C
TC = +25°C
90
650
OIP2 vs. RF FREQUENCY
110
MAX2090 toc22
POUT = 0dBm
450
RF FREQUENCY (MHz)
3rd HARMONIC vs. VPLVLSET
3rd HARMONIC vs. RF FREQUENCY
110
50
250
50
2.50
OIP2 (dBm)
450
MAX2090 toc23
250
TC = +25°C
80
70
40
50
TC = -40°C
90
TC = +95°C
40
3rd HARMONIC (dBc)
TC = +25°C
TC = -40°C
50
VCC = 4.75V
100
MAX2090 toc24
VCC = 5.00V
POUT = 0dBm
MAX2090 toc26
50
70
110
3rd HARMONIC (dBc)
70
POUT = 0dBm
fRF = 350MHz
80
VCC = 5.80V
2nd HARMONIC (dBc)
2nd HARMONIC (dBc)
80
MAX2090 toc19
POUT = 0dBm
3rd HARMONIC vs. RF FREQUENCY
2nd HARMONIC vs. VPLVLSET
90
MAX2090 toc21
2nd HARMONIC vs. RF FREQUENCY
90
1050
TC = +95°C
40
0.65
1.02
1.39
1.76
2.13
2.50
VPLVLSET (V)
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MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Functional Block Diagram
GND
GND
GND
ALM
GND
15
14
13
12
11
ALM_THRES 16
10
GND
9
GND
GND 18
8
DET_VIN
RF_OUT 19
7
GND
6
AMP_OUT
CTRL1 17
VCC_RF 20
+
MAX2090
EXPOSED PAD
1
2
3
4
5
R_BIAS
PLVLSET
CTRL2
VCC_A
RF_IN
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MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
GND
GND
ALM
GND
TOP VIEW
GND
Pin Configuration
15
14
13
12
11
ALM_THRES 16
10
GND
CTRL1 17
9
GND
8
DET_VIN
7
GND
6
AMP_OUT
MAX2090
GND 18
RF_OUT 19
EP*
2
3
4
5
VCC_A
RF_IN
R_BIAS
1
CTRL2
+
PLVLSET
VCC_RF 20
TQFN
(5mm x 5mm)
EP = EXPOSED PAD
Pin Description
PIN
NAME
FUNCTION
1
R_BIAS
2
PLVLSET
Bias Resistor Setting Input. Connect a resistor from this pin to ground.
3
CTRL2
Functional Control Bit (see Table 1)
AGC Loop Threshold-Level Input/Attenuator Control
4
VCC_A
Power-Supply Input. Bypass to ground with a 10nF capacitor as close as possible to the pin.
5
RF_IN
Attenuator Input (50I). Requires a DC-blocking capacitor.
6
AMP_OUT
8
DET_VIN
7, 9, 10, 11,
13, 14, 15, 18
GND
Ground
12
ALM
Alarm Logic Output
16
ALM_THRES
17
CTRL1
19
RF_OUT
RF Output (50I). See the Typical Application Circuit for connection details.
20
VCC_RF
Driver Amplifier Supply Voltage Input. Bypass to ground with a 10nF capacitor as close as
possible to the pin.
—
EP
Error Amplifier Output
Error Amplifier Input Voltage from an External Detector
Alarm Threshold Voltage Input. See the Alarm Operation section for operation details.
Functional Control Bit (see Table 1)
Exposed Pad. Internally connected to ground. Connect to GND for proper RF performance and
enhanced thermal dissipation.
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MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Detailed Description
The MAX2090 is a high-linearity analog VGA designed
to interface with 50I systems operating in the 50MHz
to 1000MHz frequency range. An external analog control voltage controls the analog attenuator. The device
features a gain range of -10.9dB to +26.1dB, a noise
figure of 4dB, OIP3 linearity of +38dBm, 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
+5.0V supply.
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 0 and 2.5V DC to manually adjust the
attenuator and subsequently the RF_OUT power to any
desired value. The output power at RF_OUT increases at a
rate of 19.5dB/V as PLVLSET is increased. The error amplifier and alarm are powered off in this mode, reducing the
supply current by 10mA typical. In VGA-only mode, components R5, R7, C8, C9, and C16 can be left unpopulated.
Closed-ALC Mode Operation
Closed-ALC mode operation consists of setting CTRL1 =
CTRL2 = logic 1. In this mode, the DET_IN input is driven
from an external detector through R7. Ideally, a power
detector with an output voltage range of 0.1V to 2.4V
DC is recommended, but the MAX2090 operates with
any detector whose output ranges from 0 to 2.5V DC.
PLVLSET is used to set the RF_OUT power by comparing
it to the DET_VIN (pin 8) voltage in the error amplifier. As
PLVLSET increases, the power at RF_OUT also increases. Components R5, C8, and C9 are installed to set the
response time of the loop. See the Typical Application
Circuit. This loops acts to maintain the input power to
the external detector by driving the attenuator in servo
fashion as the power level into RF_IN changes. PLVLSET
can be externally driven to a DC value between 0 and
2.5V, such that the desired power is present at RF_OUT.
Control Inputs
The MAX2090 has four control inputs: CTRL1, CTRL2,
ALM_THRES, and PLVLSET. VCC must be present before
voltages are applied to these pins. In cases where this
is not possible, a 200I 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.
Table 1. Mode Control Logic
CTRL1
CTRL2
VGA
ERROR
AMPLIFIER
ALC LOOP
ALARM
0
0
Disabled
Disabled
Disabled
Disabled
Power-down mode
1
1
Enabled
Enabled
Enabled
Enabled
Closed-ALC mode: ALC loop locks
DET_VIN to PLVLSET
1
0
Enabled
Disabled
Disabled
Disabled
VGA-only mode
0
1
—
—
—
—
FUNCTION DESCRIPTION
Factory test mode (do not use)
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11
MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Alarm Operation
Layout Considerations
The alarm ALM output remains in a logic-high state while
DET_VIN is above the 1.35V nominal. ALM_THRES has
135kI input resistance and is set internally to 1.35V
(typ) such that ALM triggers when DET_VIN is below
1.35V. Alternatively, the voltage on ALM_THRES can
be externally driven to allow alternative power-level trip
points. When DET_IN is used to drive the DET_VIN pin
through R7, the nominal value for ALM logic-high is typically above 1.22V at DET_IN. The ALM comparator has
typical hysteresis of 29mV.
The pin configuration of the MAX2090 is optimized to
facilitate a very compact physical layout of the device
and its associated discrete components. The exposed
pad (EP) 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.
Table 2. Typical Application Circuit Component Values
MODE OF OPERATION
COMPONENT
VGA
ONLY
CLOSED
ALC
VALUE
C1, C5
√
√
1000pF
C2, C3
√
√
0.01FF
C8
—
√
100nF
C9
—
√
820pF
SIZE
SUPPLIER
DESCRIPTION
0402
Murata
C0G dielectric
0402
Murata
X7R dielectric
0603
Murata
X7R dielectric
0402
Murata
C0G dielectric
C14*
—
Do not install
0402
—
—
C16
—
√
0.01FF
0402
Murata
X7R dielectric
L1
√
√
330nH
0603
Coilcraft
Ferrite LS series
5% tolerance
R1
√
√
1.78kI
0402
Panasonic
1% tolerance
R5
—
√
150I
0402
Panasonic
1% tolerance
R7
—
√
24kI
0402
Panasonic
5% tolerance
R11*
√
√
0I
Panasonic
1% tolerance
U1
√
√
—
0402
20-pin TQFN
(5mm x
5mm)
Maxim
MAX2090ETP+
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 external PLVLSET control source.
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12
MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
15
C16
ALM_THRES
CTRL1
14
13
GND
ALM
GND
GND
GND
Typical Application Circuit
12
11
16
10
17
9
GND
GND
MAX2090
GND
C5
RF_OUT
RF_OUT
VCC
L1
VCC_RF
18
8
19
7
20
EXPOSED PAD
6
R7
DET_VIN
DET_IN
GND
AMP_OUT
C8
R5
C9
C3
5
VCC
C1
R1
C14
C2
RF_IN
R11
4
RF_IN
R_BIAS
3
VCC_A
2
PLVLSET
1
CTRL2
+
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2090ETP+
-40NC to +95NC
20 TQFN-EP*
MAX2090ETP+T
-40NC to +95NC
20 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape and reel.
Chip Information
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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-EP
T2055+5
21-0140
90-0010
PROCESS: SiGe BiCMOS
Maxim Integrated
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13
MAX2090
50MHz to 1000MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Revision History
REVISION
NUMBER
REVISION
DATE
0
9/11
1
9/12
DESCRIPTION
Initial release
Updated existing data sheet to remove references to detector circuit,
added 26 new TOCs, updated Electrical Characteristics table, updated Tables 1
and 2
PAGES
CHANGED
—
1–14
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated 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.
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www.BDTIC.com/maxim
© 2012 Maxim Integrated Products, Inc.
14
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.