19-1872; Rev 1; 4/02
KIT
ATION
EVALU
BLE
AVAILA
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
Features
o
Low Noise Figure
MAX2654: 1.5dB at 1575MHz
MAX2655: 1.45dB at 1575MHz
MAX2656: 1.9dB at 1960MHz
o
High Gain
MAX2654: 15.1dB at 1575MHz
MAX2655: 14.1dB at 1575MHz
MAX2656: 13.5dB at 1960MHz
o
12.7dB Gain Step (MAX2656 only)
o
Integrated 50Ω Output Matching
o
Variable IP3 Set by One Bias Resistor
(MAX2655/MAX2656 only)
o
0.1µA Shutdown Mode (MAX2654/MAX2655 only)
o
+2.7V to +5.5V Single-Supply Operation
o
Ultra-Small 6-Pin SC70 Package
General Description
The MAX2654/MAX2655/MAX2656 high third-order
intercept point (IP3), low-noise amplifiers (LNAs) are
designed for applications in GPS, PCS, WLL, and satel-
lite phone systems. The MAX2654/MAX2655/MAX2656
incorporate on-chip internal output matching to 50Ω,
eliminating the need for external matching components.
A shutdown feature in the MAX2654/MAX2655 reduces
the operating current to 0.1µA, eliminating the need for
an external supply switch.
The MAX2654 operates in the GPS frequency of
1575MHz with 15.1dB of gain, 1.5dB noise figure, and
only consumes 5.8mA. The MAX2655 is designed with
high-input IP3 to improve operation in cellular applica-
tions where the cellular power amplifier leaks into the
GPS receiver. The MAX2656 is designed for PCS
phone applications with 13.5dB of gain in high-gain
mode and 0.8dB of gain in low-gain mode (selected by
a logic control) and 1.9dB noise figure.
The IP3 of MAX2655/MAX2656 is adjustable by a single
external bias resistor (R
BIAS
), allowing supply current to
be optimized for a specific application.
The MAX2654/MAX2655/MAX2656 operate from a
+2.7V to +5.5V single supply and are available in the
miniature 6-pin SC70 package.
MAX2654/MAX2655/MAX2656
Ordering Information
PART
MAX2654EXT-T
MAX2655EXT-T
MAX2656EXT-T
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +95°C
PIN-
PACKAGE
6 SC70-6
6 SC70-6
6 SC70-6
SOT
TOP-
MARK
AAI
AAJ
AAK
________________________Applications
GPS Receivers
GPS Receivers in Cellular Phones
DCS/PCS Cellular Phones
Satellite Phones
Wireless Local Loop
Typical Operating Circuit
V
CC
= +3V
Cb
Pin Configuration
BIAS (GND)
1
6
RFOUT
MAX2655
MAX2656
1
R
BIAS
4
BIAS
V
CTRL
/GND
GND
2
MAX2654
MAX2655
MAX2654
10kΩ
5
GND
RFIN
C1
C2
L1
3
6
RFOUT
RFIN
3
4
V
CC
SC70-6
ARE FOR MAX2654 ONLY
(1)
( ) ARE FOR MAX2654 ONLY
2
5
PART
MAX2654
MAX2655
MAX2656
FREQUENCY
1575
1575
1960
L1 (nH)
5.6
5.6
4.7
C1 (pF)
6
1800
1800
C2 (pF)
1.6
1.5
1.2
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
MAX2654/MAX2655/MAX2656
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND .............................................................-0.3V to +6V
RF Input Power .................................................................+5dBm
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, R
BIAS
= 511Ω ±1%, T
A
= -40°C to +85°C. No RF signal applied. RFIN is AC-coupled and terminated to 50Ω.
RFOUT is unconnected. Typical values are at V
CC
= +3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Operating Supply Current
(MAX2654 only)
V
RFOUT
= V
CC
V
RFOUT
= GND
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
R
BIAS
= 511Ω
±1%
V
RFOUT
= V
CC
T
A
= +25°C
R
BIAS
= 698Ω
±1%
R
BIAS
= 357Ω
±1%
R
BIAS
= 511Ω
±1%,
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
R
BIAS
= 511Ω
±1%
Operating Supply Current
(MAX2656 only)
V
RFOUT
= GND
T
A
= +25°C
R
BIAS
= 715Ω
±1%
R
BIAS
= 511Ω
±1%,
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
2
0.6
15.6
71
1
-24
11.5
8.5
13.6
12.3
14.6
mA
V
V
µA
µA
0.1
8.3
5.9
10.1
11.1
1
2.2
15.2
mA
µA
mA
0.1
CONDITIONS
MIN
2.7
5.8
TYP
MAX
5.5
8.2
9.2
1
2.1
10
UNIT
V
mA
µA
Operating Supply Current
(MAX2655 only)
V
RFOUT
= GND
V
RFOUT
= V
CC
Input Logic High at V
RFOUT
Input Logic Low at V
RFOUT
Input Logic High Current
at V
RFOUT
(Note 4)
Input Logic Low Current
at V
RFOUT
(Note 5)
(Note 2)
(Note 3)
MAX2654/MAX2655
MAX2656
MAX2654/MAX2655
MAX2656
2
_______________________________________________________________________________________
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS (MAX2654)
(MAX2654 Evaluation Kit, V
CC
= +3.0V, P
IN
= -30dBm, f
IN
= 1575MHz, V
RFOUT
= V
CC
through a 10kΩ resistor, T
A
= +25°C. Typical
values are at V
CC
= +3V, T
A
= +25°C, unless otherwise noted.) (Note 6)
PARAMETER
Operating Frequency Range (Note 7)
Gain
Gain Variation Over Temperature
Input Third-Order Intercept Point
(Note 9)
Input 1dB Compression Point
Noise Figure (Note 10)
Input Return Loss
Output Return Loss
Reverse Isolation
(Note 8)
T
A
= -40°C to +85°C
CONDITIONS
MIN
1400
12.7
15.1
0.15
-7.2
-18
1.5
9.7
8.4
30
1.8
1
TYP
MAX
1700
UNIT
MHz
dB
dB
dBm
dBm
dB
dB
dB
dB
MAX2654/MAX2655/MAX2656
AC ELECTRICAL CHARACTERISTICS (MAX2655)
(MAX2655 Evaluation Kit, V
CC
= +3.0V, P
IN
= -30dBm, f
IN
= 1575MHz, V
RFOUT
= V
CC
through a 10kΩ resistor, R
BIAS
= 511Ω ±1%,
T
A
= +25°C. Typical values are at V
CC
= +3V, T
A
= +25°C, unless otherwise noted.) (Note 6)
PARAMETER
Operating Frequency Range (Note 7)
Gain
Gain Variation Over Temperature
Input Third-Order Intercept Point
(Note 9)
Input 1dB Compression Point
Noise Figure (Note 10)
Input Return Loss
Output Return Loss
Reverse Isolation
(Note 8)
T
A
= -40°C to +85°C
R
BIAS
= 511Ω
±1%
R
BIAS
= 698Ω
±1%
R
BIAS
= 357Ω
±1%
CONDITIONS
MIN
1400
12
14.1
0.6
2.8
2.2
3.8
-12.2
1.45
16.1
15.5
32
1.9
dBm
dB
dB
dB
dB
dBm
1.1
TYP
MAX
1700
UNIT
MHz
dB
dB
_______________________________________________________________________________________
3
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
MAX2654/MAX2655/MAX2656
AC ELECTRICAL CHARACTERISTICS (MAX2656)
(MAX2656 Evaluation Kit, V
CC
= +3V, P
IN
= -30dBm, f
IN
= 1960MHz, V
RFOUT
= GND through a 12kΩ resistor, R
BIAS
= 511Ω ±1%, T
A
= +25°C. Typical values are at V
CC
= +3V, T
A
= +25°C, unless otherwise noted.) (Note 6)
PARAMETER
Operating Frequency Range (Note 7)
Gain, High-Gain Mode
Gain, Low-Gain Mode
Gain Variation Over Temperature
Gain Step
Input Third-Order Intercept Point
(Note 13)
Input 1dB Compression Point
Noise Figure (Note 10)
Input Return Loss
Output Return Loss
Reverse Isolation
Gain Step Response Time
R
BIAS
= 511Ω
±
1%
R
BIAS
= 715Ω
±
1%
Low-gain mode (Note 12)
High-gain mode (Note 11)
Low-gain mode (Note 12)
High-gain mode (Note 11)
Low-gain mode (Note 12)
High-gain mode (Note 11)
Low-gain mode (Note 12)
High-gain mode (Note 11)
Low-gain mode (Note 12)
High-gain mode (Note 11)
Low-gain mode (Note 12)
(Note 11)
(Note 12)
T
A
= -40°C to +85°C
CONDITIONS
MIN
1800
12
13.5
0.8
0.3
12.7
1.5
-3
7.2
-7
-1.2
1.9
10.8
14.4
19.3
10.7
7.3
28
25
3.2
2.4
dBm
dB
dB
dB
dB
µs
dBm
1.2
TYP
MAX
2000
UNIT
MHz
dB
dB
dB
dB
Note 1:
Devices are production tested at T
A
= +25°C. Minimum and maximum values are guaranteed by design and characteriza-
tion over temperature and supply voltages to ±6 sigma.
Note 2:
Minimum DC voltage through a 10kΩ resistor that sets the MAX2654/MAX2655 to operate in normal mode and MAX2656 in
low-gain mode.
Note 3:
Maximum DC voltage through a 10kΩ resistor that sets the MAX2654/MAX2655 to operate in shutdown mode and
MAX2656 in high-gain mode.
Note 4:
DC current required when V
RFOUT
is connected to V
CC
through a 10kΩ resistor.
Note 5:
DC current required when V
RFOUT
is connected to GND through a 10kΩ resistor.
Note 6:
Guaranteed by design and characterization to ±3 sigma.
Note 7:
The part has been characterized at the specified frequency range. Operation outside of this range is possible, but not
guaranteed.
Note 8:
Production tested at T
A
= +25°C.
Note 9:
Measured with two input tones, f
1
= 1570MHz, f
2
= 1580MHz, both at -30dBm per tone.
Note 10:
Excludes PC board losses of 0.2dB for MAX2654/MAX2655 and 0.25dB for MAX2656.
Note 11:
High-gain mode is set up by connecting RFOUT to GND through a 12kΩ resistor.
Note 12:
Low-gain mode is set up by connecting RFOUT to V
CC
through a 12kΩ resistor.
Note 13:
Measured with two input tones, f
1
= 1955MHz, f
2
= 1965MHz, both at -30dBm per tone.
4
______________________________________________________________________________________
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
Typical Operating Characteristics
(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
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2654 toc01
MAX2654/MAX2655/MAX2656
MAX2654
SHUTDOWN CURRENT vs. TEMPERATURE
14
SHUTDOWN CURRENT (µA)
12
10
8
6
4
2
0
V
CC
= +3V
-40
-20
0
20
40
60
80
0.5
V
CC
= +6V
MAX2654 toc02
MAX2654
INPUT LOGIC VOLTAGE vs. TEMPERATURE
INPUT LOGIC HIGH AT V
RFOUT
INPUT LOGIC VOLTAGE (V)
MAX2654 toc03
8
7
SUPPLY CURRENT (mA)
6
5
4
3
T
A
= +25°C
2
1
0
2
3
4
SUPPLY VOLTAGE (V)
5
6
T
A
= -40°C
T
A
= +85°C
2.0
1.5
INPUT LOGIC LOW AT V
RFOUT
1.0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX2654
INPUT LOGIC CURRENT vs. TEMPERATURE
MAX2654 toc04
MAX2654
INPUT LOGIC CURRENT vs. TEMPERATURE
MAX2654 toc05
MAX2654
INPUT IP3 vs. TEMPERATURE
f
1
= 1570 MHz
f
2
= 1580 MHz
MAX2654 toc06
8
INPUT LOGIC HIGH AT V
RFOUT
INPUT LOGIC CURRENT (µA)
7
60
INPUT LOGIC LOW AT V
RFOUT
INPUT LOGIC CURRENT (µA)
55
-6
-7
INPUT IP3 (dBm)
6
50
-8
4
45
-9
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
40
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
-10
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
MAX2654
GAIN vs. FREQUENCY
MAX2654 toc07
MAX2654
GAIN vs. SUPPLY VOLTAGE
MAX2654 toc08
MAX2654
NOISE FIGURE vs. FREQUENCY
3.0
2.8
NOISE FIGURE (dB)
2.6
2.4
2.2
2.0
MAX2654 toc09
16
14
12
GAIN (dB)
15
3.2
14
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
8
6
4
2
0
1000 1200
1400
1600 1800
2000
2200
FREQUENCY (MHz)
GAIN (dB)
10
13
12
11
1.8
10
f
0
= 1575MHz
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
1.6
1000
1200
1400
1600
1800
2000
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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