MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
_______________________________________________________________________________________ 5
12.6
13.0
12.8
13.4
13.2
13.8
13.6
14.0
800 880840 920 960820 900860 940 980 1000
MAX2642
ATTENUATION STEP vs. FREQUENCY
MAX2642/43-10
FREQUENCY (MHz)
ATTENUATION STEP (dB)
MATCHED AT 900MHz
-35
-25
-30
-15
-20
-5
-10
0
800 880840 920 960820 900860 940 980 1000
RETURN LOSS vs. FREQUENCY
(HIGH GAIN)
MAX2642/43-11
FREQUENCY (MHz)
ATTENUATION STEP (dB)
MATCHED AT 900MHz
INPUT
OUTPUT
-35
-25
-30
-15
-20
-5
-10
0
800 880840 920 960820 900860 940 980 1000
MAX2642
RETURN LOSS vs. FREQUENCY
(LOW GAIN)
MAX2642/43-12
FREQUENCY (MHz)
RETURN LOSS (dB)
MATCHED AT 900MHz
INPUT
OUTPUT
-35
-25
-30
-15
-20
-5
-10
0
800 880840 920 960820 900860 940 980 1000
REVERSE ISOLATION vs. FREQUENCY
MAX2642/43-13
FREQUENCY (MHz)
RETURN LOSS (dB)
MATCHED AT 900MHz
LOW GAIN
HIGH GAIN
-60
-50
-20
-10
-30
-40
0
MAX2642
HIGH/LOW-GAIN SWITCH
CHARACTERISTICS
MAX2642/43-14
TIME (400ns/div)
OUTPUT POWER (dBm)
V
RFOUT
0V
3V
-90
-70
-80
-50
-60
-40
-30
-10
-20
0
MAX2643
SHUTDOWN CHARACTERISTICS
MAX2642/43-15
TIME (4µs/div)
OUTPUT POWER (dBm)
V
RFOUT
0V
3V
0
4
2
8
6
10
12
14
16
0 400 600200 800 1000 1200 1400 1600
SUPPLY CURRENT vs. R
BIAS
MAX2642/43-16
R
BIAS
(Ω)
SUPPLY CURRENT (mA)
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= +85°C, LOW GAIN
T
A
= +25°C, LOW GAIN
T
A
= +25°C, HIGH GAIN
T
A
= -40°C, HIGH GAIN
0.0001
0.1
0.01
0.001
10
1
-40 -20 0 20 40 60 80 100
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX2642/43-17
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
V
CC
= 5.5V
V
CC
= 3.0V
4.0
4.8
4.4
5.6
5.2
6.4
6.0
6.8
7.6
7.2
8.0
2.4 3.2 3.62.8 4.0 4.4 4.8 5.2 5.6
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2642/43-18
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (mA)
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= +85°C, LOW GAIN
T
A
= +25°C, LOW GAIN
T
A
= +25°C, HIGH GAIN
T
A
= -40°C,
HIGH GAIN
Typical Operating Characteristics (continued)
(MAX2642/MAX2643 EV kits, V
CC
= +3.0V, P
RFIN
= -30dBm, input and output are terminated to 50Ω, f
RFIN
= 900MHz, R
BIAS
=
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), T
A
= +25°C, unless otherwise noted.)
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