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MAX2656EXT+T

P1-P3P4-P6P7-P9P10-P12P13-P14
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
10 ______________________________________________________________________________________
0
16
14
12
10
8
6
4
2
1000 16001200 1400 20001800 2200
MAX2656
GAIN vs. FREQUENCY
MAX2654 toc46
FREQUENCY (MHz)
GAIN (dB)
HIGH-GAIN MODE
R
BIAS
= 392Ω ±1%
R
BIAS
= 698Ω ±1%
R
BIAS
= 511Ω ±1%
-4
4
3
2
1
0
-1
-2
-3
1000 1600 18001200 1400 2000 2200
MAX2656
GAIN vs. FREQUENCY
MAX2654 toc47
FREQUENCY (MHz)
GAIN (dB)
LOW-GAIN MODE
R
BIAS
= 392Ω ±1%
R
BIAS
= 715Ω ±1%
R
BIAS
= 511Ω ±1%
6
14
17
15
16
18
13
8
11
9
10
12
7
200 600 800400 1000 1200 1400 1600
MAX2656
GAIN vs. R
BIAS
MAX2654 toc48
R
BIAS
(Ω)
GAIN (dB)
f
IN
= 1960MHz
HIGH-GAIN MODE
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
-2
2
3
4
-1
0
1
200 600 800400 1000 1200 1400 1600
MAX2656
GAIN vs. R
BIAS
MAX2654 toc49
R
BIAS
(Ω)
GAIN (dB)
f
IN
= 1960MHz
LOW-GAIN MODE
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
0
1
2
3
2.5 4.0 4.53.0 3.5 5.0 5.5 6.0
MAX2656
GAIN vs. SUPPLY VOLTAGE
MAX2654 toc50
SUPPLY VOLTAGE (V)
GAIN (dB)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
R
BIAS
= 511Ω ±1%
f
IN
= 1960MHz
LOW-GAIN MODE
14.0
14.5
15.0
15.5
16.0
2.5 4.0 4.53.0 3.5 5.0 5.5 6.0
MAX2656
GAIN vs. SUPPLY VOLTAGE
MAX2654 toc51
SUPPLY VOLTAGE (V)
GAIN (dB)
R
BIAS
= 511Ω ±1%
f
1
= 1960MHz
HIGH-GAIN MODE
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
1.4
1.6
2.0
1.8
2.2
2.4
1500 1700 18001600 1900 2000 2100 2200 2300
MAX2656
NOISE FIGURE vs. FREQUENCY
MAX2654 toc52
FREQUENCY
(
MHz
)
NOISE FIGURE (dB)
R
BIAS
= 715Ω ±1%
R
BIAS
= 511Ω ±1%
R
BIAS
= 392Ω ±1%
2.2
2.0
2.4
1.8
1.6
1.4
1.2
1.0
-40 20
-20
0406080
MAX2656
NOISE FIGURE vs. TEMPERATURE
MAX2654 toc53
TEMPERATURE
(
°C
)
NOISE FIGURE (dB)
f
1
= 1960MHz
R
BIAS
= 511Ω ±1%
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
1000 1600 18001200 1400 2000 2200
MAX2656
INPUT/OUTPUT RETURN LOSS vs. FREQUENCY
MAX2654 toc54
FREQUENCY
(
MHz
)
INPUT/OUTPUT RETURN LOSS (dB)
LOW-GAIN MODE
INPUT
RETURN LOSS
OUTPUT
RETURN LOSS
Typical Operating Characteristics (continued)
(P
IN
= -30dBm, input and output are terminated to 50Ω, V
CC
= +3V, high-gain and low-gain modes are applicable only to the MAX2656,
T
A
= +25°C, unless otherwise noted.)
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
______________________________________________________________________________________ 11
0
-2
-4
-6
-8
-10
-12
-14
1000 1600 18001200 1400 2000 2200
MAX2656
INPUT/OUTPUT RETURN LOSS vs. FREQUENCY
MAX2654 toc55
FREQUENCY (MHz)
INPUT/OUTPUT RETURN LOSS (dB)
HIGH-GAIN MODE
INPUT
RETURN LOSS
OUTPUT
RETURN LOSS
-45
-50
-55
-60
-25
-20
-30
-35
-40
1000 1600 18001200 1400 2000 2200
MAX2656
REVERSE ISOLATION vs. FREQUENCY
MAX2654 toc56
FREQUENCY (MHz)
REVERSE ISOLATION (dB)
HIGH-GAIN MODE
LOW-GAIN MODE
-40
-30
-35
-20
-25
-15
-10
0 2.01.0 3.0 4.0
MAX2656
GAIN STEP TIME FROM LOW TO HIGH
MAX2654 toc57
TIME (µs)
OUTPUT POWER (dBm)
2.0µs
-40
-30
-35
-20
-25
-15
-10
0 2.01.0 3.0 4.0
MAX2656
GAIN STEP TIME FROM HIGH TO LOW
MAX2654 toc58
TIME (µs)
OUTPUT POWER (dBm)
2.0µs
-20
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-18
-16
-30 -15 -10-25 -20 -5 0
MAX2656
OUTPUT POWER vs. INPUT POWER
MAX2654 toc59
INPUT POWER (dBm)
OUTPUT POWER (dBm)
f
IN
= 1960MHz
HIGH-GAIN MODE
R
BIAS
= 715Ω ±1%
R
BIAS
= 511Ω ±1%
R
BIAS
= 392Ω ±1%
-30
2
-2
-6
-10
-14
-18
-22
-26
-30 -15 -10-25 -20 -5 0
MAX2656
OUTPUT POWER vs. INPUT POWER
MAX2654 toc60
INPUT POWER (dBm)
OUTPUT POWER (dBm)
f
IN
= 1960MHz
LOW-GAIN MODE
R
BIAS
= 715Ω ±1%
R
BIAS
= 511Ω ±1%
R
BIAS
= 392Ω ±1%
Typical Operating Characteristics (continued)
(P
IN
= -30dBm, input and output are terminated to 50Ω, V
CC
= +3V, high-gain and low-gain modes are applicable only to the MAX2656,
T
A
= +25°C, unless otherwise noted.)
-12
2
4
0
-4
-2
-6
-10
-8
200 600 800400 1000 1200 1400 1600
MAX2656
P
1dB
vs. R
BIAS
MAX2654 toc62
R
BIAS
(Ω)
P
1dB
(dBm)
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
f
IN
= 1960MHz
HIGH-GAIN MODE
-10
2
4
0
-4
-2
-6
-8
200 600 800400 1000 1200 1400 1600
MAX2656
P
1dB
vs. R
BIAS
MAX2654 toc61
R
BIAS
(Ω)
P
1dB
(dBm)
T
A
= +25°C
T
A
= +40°C
f
IN
= 1960MHz
LOW-GAIN MODE
T
A
= +85°C
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
12 ______________________________________________________________________________________
Detailed Description
The MAX2654/MAX2655/MAX2656 are low-noise ampli-
fiers designed for applications in GPS receivers, satel-
lite and PCS phones. The MAX2655/MAX2656 feature
variable IP3s, adjusted by a single external bias resis-
tor. Another feature of the MAX2654/MAX2655 is a
power shutdown control mode, eliminating the need for
an external supply switch. The MAX2656 features a
high- and low-gain control mode selected by an exter-
nal logic control.
Input and Output Ports
The MAX2654/MAX2655/MAX2656 incorporate on-chip
matching networks to 50Ω at the output ports, eliminat-
ing the need for external matching components. (For
MAX2655, a shunt inductor is recommended for best
output return loss. Refer to the MAX2655 EV kit
schematic.) The MAX2654/MAX2655/MAX2656 require
simple matching networks at the input ports. The values
of these matching components are recommended in
the Typical Operating Circuit.
Variable IP3
The IP3 of MAX2655 and MAX2656 is adjusted through
an external resistor (R
BIAS
). Tables 1 and 2 summarize
the values of R
BIAS
for different IP3s for MAX2655 and
MAX2656.
Gain-Step Control (MAX2656)
The DC bias voltage at RFOUT of the MAX2656 serves
as a gain-step control input. When the applied DC volt-
age at RFOUT through a 10kΩ resistor is less than
+0.6V, the device is in high-gain mode. When the
applied DC voltage is greater than +2.0V, the device
gain is attenuated by 13dB. A standard logic output
can be applied as shown in the Typical Operating
Circuit.
Shutdown-Enable (MAX2654/MAX2655)
The DC bias voltage at RFOUT of the MAX2654/
MAX2655 serves as a shutdown enable input. When the
applied DC voltage at RFOUT through a 10kΩ resistor
is less than +0.6V, the device is in shutdown mode.
When the DC voltage is greater than +2V, the device is
enabled.
Pin Description
Table 1. R
BIAS
vs. IP3 for MAX2655
R
BIAS
(Ω) IP3 (dBm) I
CC
(mA)
698 2.2 5.8
357 3.8 10.1
Table 2. R
BIAS
vs. IP3 for MAX2656
R
BIAS
(Ω) IP3 (dBm) I
CC
(mA)
715 -3 8.5
511 1.5 11.5
PIN
MAX2654
MAX2655/
MAX2656
NAME DESCRIPTION
1 ––– GND G r ound . C onnect to the P C b oar d g r ound p l ane thr oug h a 0.017i n x 0.035i n l i ne.
2, 5 2, 5 GND
Ground. Connect to the P C b oar d ground plane with as low an inductance path as
possible.
––– 1 BIAS
Bias Control. Connect a resistor R
BIAS
from BIAS to GND. R
BIAS
sets IP3 and
supply current.
3 3 RFIN Amplifier Input. Requires a DC-blocking capacitor and external matching components.
44V
CC
Supply Voltage. Bypass to ground with an appropriate capacitor as close to the IC as
possible. Refer to MAX2654/MAX2655/MAX2656 EV kits for capacitor values.
6 6 RFOUT
RF Output. Incorporates an internal DC-blocking capacitor. RFOUT is internally
matched to 50Ω. DC bias on this pin selects gain mode (MAX2656) or shutdown mode
(MAX2654/MAX2655) (see Applications Information).
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX2656EXT+T

Mfr. #:
Buy MAX2656EXT+T
Manufacturer:
Maxim Integrated
Description:
RF Amplifier 1575MHz/1900MHz Variable-IP3
Lifecycle:
New from this manufacturer.
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