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3.4GHz to 3.8GHz SiGe
Low-Noise Amplifier/PA Predriver
AC ELECTRICAL SPECIFICATIONS — PA Predriver Application Circuit
(MAX2645 EV kit, V CC = GAIN = SHDN = +3.3V,R BIAS = 20k ? ±1%, P RFIN = -20dBm, f RFIN = 3550MHz, Z o = 50 ? ,
T A = +25 ° C, unless otherwise noted.)
PARAMETER
Frequency Range
Gain
Gain Variation over Temperature
CONDITIONS
(Note 2)
GAIN = V CC
GAIN = GND
T A = -40 ° C to +85 ° C, GAIN = V CC or GND
MIN
3400
TYP
15.2
-9.7
±0.3
MAX
3800
UNITS
MHz
dB
dB
Gain Step
24.9
dB
Input Third-Order Intercept
Input 1dB Compression Point
Noise Figure
Reverse Isolation
GAIN = V CC (Note 6)
GAIN = GND (Note 7)
GAIN = V CC
GAIN = GND
GAIN = V CC
GAIN = GND
GAIN = V CC
GAIN = GND
+11.8
+16.2
-1.8
0
2.6
16
25
19
dBm
dBm
dB
dB
Note 1: Limits over temperature guaranteed by correlation to worst-case temperature testing.
Note 2: This is the recommended operating frequency range. Operation outside this frequency range is possible but has not been
characterized. The device is characterized and tested at 3550MHz. For optimum performance at a given frequency, the out-
put matching network must be properly designed. See Applications Information section.
Note 3: Specifications are corrected for board losses (0.25dB at input, 0.25dB at output).
Note 4: Guaranteed by design and characterization.
Note 5: Input IP3 measured with two tones, f 1 = 3550MHz and f 2 = 3551MHz, at -20dBm per tone.
Note 6: Input IP3 measured with two tones, f 1 = 3550MHz and f 2 = 3551MHz, at -12dBm per tone.
Note 7: Specifications are corrected for board losses (0.25dB at input).
Note 8: Time from when GAIN changes state to when output power reaches 1dB of its final value.
Note 9: Time from when SHDN changes state to when output power reaches 1dB of its final value.
Typical Operating Characteristics
(MAX2645 EV kit, V CC = +3.3V, R BIAS = 20k ? , f RFIN = 3550MHz, T A = +25 ° C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
15
(HIGH-GAIN MODE)
5.0
(LOW-GAIN MODE)
20
SUPPLY CURRENT vs. R BIAS
14
R BIAS = 15k ?
T A = +85°C
4.5
13
12
T A = +25°C
4.0
R BIAS = 15k ?
T A = +25°C
T A = +85 °C
15
V CC = 5V
11
10
T A = -40°C
T A = +25°C
T A = +85°C
3.5
3.0
T A = -40°C
T A = +25°C
T A = +85°C
10
V CC = 3.3V V
CC = 5V
HIGH GAIN
9
8
7
T A = -40°C
R BIAS = 20k ?
2.5
2.0
T A = -40°C
R BIAS = 20k ?
5
0
V CC = 3.3V
LOW GAIN
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
5.5
15
20
25
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
R BIAS (k ? )
4
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