Rainbow Electronics MAX2656 User Manual

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 satel­lite 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 applica­tions 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.

________________________Applications

GPS Receivers

GPS Receivers in Cellular Phones

DCS/PCS Cellular Phones

Satellite Phones

Wireless Local Loop

Features

♦ Low Noise Figure

MAX2654: 1.5dB at 1575MHz
MAX2655: 1.45dB at 1575MHz
MAX2656: 1.9dB at 1960MHz

♦ High Gain

MAX2654: 15.1dB at 1575MHz
MAX2655: 14.1dB at 1575MHz
MAX2656: 13.5dB at 1960MHz

♦ 12.7dB Gain Step (MAX2656 only)

♦ Integrated 50Ω Output Matching

♦ Variable IP3 Set by One Bias Resistor

(MAX2655/MAX2656 only)

♦ 0.1µA Shutdown Mode (MAX2654/MAX2655 only)

♦ +2.7V to +5.5V Single-Supply Operation

♦ Ultra-Small 6-Pin SC70 Package

MAX2654/MAX2655/MAX2656

1575MHz/1900MHz Variable-IP3

Low-Noise Amplifiers

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

MAX2655
MAX2656

C2

3

4

6

10kΩ

Cb

(1)

1

25

C1

R

BIAS

V

CTRL

/GND

V

CC

= +3V

RFOUT

RFIN

L1

BIAS

( ) ARE FOR MAX2654 ONLY

Typical Operating Circuit

19-1872; Rev 1; 4/02

EVALUATION KIT

AVAILABLE

Ordering Information

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.

PART

MAX2654EXT-T -40°C to +85°C

MAX2655EXT-T -40°C to +85°C

MAX2656EXT-T -40°C to +95°C

TEMP

RANGE

PIN-

PACKAGE

6 SC70-6

6 SC70-6

6 SC70-6

SOT

TOP-

MARK

AAI

AAJ

AAK

ARE FOR MAX2654 ONLY

BIAS (GND)

5

RFOUT

GND

V

CC

16

MAX2654

2

GND

RFIN

MAX2655
MAX2654

34

SC70-6

PART FREQUENCY L1 (nH) C1 (pF) C2 (pF)

MAX2654 1575 5.6 6 1.6

MAX2655 1575 5.6 1800 1.5

MAX2656 1960 4.7 1800 1.2

MAX2654/MAX2655/MAX2656

1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

VCCto 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

DC ELECTRICAL CHARACTERISTICS

(V

CC

= +2.7V to +5.5V, R

BIAS

= 511Ω ±1%, TA= -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, TA= +25°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNIT

Supply Voltage 2.7 5.5 V

Operating Supply Current
(MAX2654 only)

Operating Supply Current

RFOUT

V

RFOUT

V

RFOUT

T

= +25°C

A

CC

= GND

= V

CC

V

= V

(MAX2655 only)

V

= GND

RFOUT

= GND

V

RFOUT

= +25°C

T

A

Operating Supply Current
(MAX2656 only)

Input Logic High at V

Input Logic Low at V

RFOUT

RFOUT

Input Logic High Current
at V

RFOUT

(Note 4)

Input Logic Low Current
at V

RFOUT

(Note 5)

V

= V

RFOUT

CC

(Note 2) 2 V

(Note 3) 0.6 V

MAX2654/MAX2655 15.6

MAX2656 71

MAX2654/MAX2655 1

MAX2656 -24

TA = +25°C 5.8 8.2

TA = -40°C to +85°C 9.2

TA = +25°C 0.1 1

= -40°C to +85°C 2.1

T

A

R

= 511Ω ±1% 8.3 10

BIAS

R

= 698Ω ±1% 5.9

BIAS

R

= 357Ω ±1% 10.1

BIAS

R

= 511Ω ±1%,

BIAS

= -40°C to +85°C

T

A

11.1

TA = +25°C 0.1 1

T

= -40°C to +85°C 2.2

A

R

= 511Ω ±1% 11.5 15.2

BIAS

R

= 715Ω ±1% 8.5

BIAS

R

= 511Ω ±1%,

BIAS

T

= +85°C

A

13.6

TA = +25°C 12.3

TA = +85°C 14.6

mA

µA

mA

µA

mA

mA

µA

µA

MAX2654/MAX2655/MAX2656

1575MHz/1900MHz Variable-IP3

Low-Noise Amplifiers

AC ELECTRICAL CHARACTERISTICS (MAX2654)

(MAX2654 Evaluation Kit, VCC= +3.0V, PIN= -30dBm, f

IN

= 1575MHz, V

RFOUT

= VCCthrough a 10kΩ resistor, TA= +25°C. Typical

values are at V

CC

= +3V, TA= +25°C, unless otherwise noted.) (Note 6)

AC ELECTRICAL CHARACTERISTICS (MAX2655)

(MAX2655 Evaluation Kit, VCC= +3.0V, PIN= -30dBm, f

IN

= 1575MHz, V

RFOUT

= VCCthrough a 10kΩ resistor, R

BIAS

= 511Ω ±1%,

T

A

= +25°C. Typical values are at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 6)

_______________________________________________________________________________________ 3

Operating Frequency Range (Note 7) 1400 1700 MHz

Gain (Note 8) 12.7 15.1 dB

Gain Variation Over Temperature TA = -40°C to +85°C 0.15 1 dB

Input Third-Order Intercept Point
(Note 9)

Input 1dB Compression Point -18 dBm

Noise Figure (Note 10) 1.5 1.8 dB

Input Return Loss 9.7 dB

Output Return Loss 8.4 dB

Reverse Isolation 30 dB

PARAMETER CONDITIONS MIN TYP MAX UNIT

-7.2 dBm

Operating Frequency Range (Note 7) 1400 1700 MHz

Gain (Note 8) 12 14.1 dB

Gain Variation Over Temperature TA = -40°C to +85°C 0.6 1.1 dB

Input Third-Order Intercept Point
(Note 9)

Input 1dB Compression Point -12.2 dBm

Noise Figure (Note 10) 1.45 1.9 dB

Input Return Loss 16.1 dB

Output Return Loss 15.5 dB

Reverse Isolation 32 dB

PARAMETER CONDITIONS MIN TYP MAX UNIT

R

= 511Ω ±1% 2.8

BIAS

R

= 698Ω ±1% 2.2 dBm

BIAS

R

= 357Ω ±1% 3.8

BIAS

MAX2654/MAX2655/MAX2656

1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers

AC ELECTRICAL CHARACTERISTICS (MAX2656)

(MAX2656 Evaluation Kit, VCC= +3V, PIN= -30dBm, f

IN

= 1960MHz, V

RFOUT

= GND through a 12kΩ resistor, R

BIAS

= 511Ω ±1%, T

A

= +25°C. Typical values are at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 6)

Note 1: Devices are production tested at TA= +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 VCCthrough 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, f2= 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, f2= 1965MHz, both at -30dBm per tone.

4 ______________________________________________________________________________________

Operating Frequency Range (Note 7) 1800 2000 MHz

Gain, High-Gain Mode (Note 11) 12 13.5 dB

Gain, Low-Gain Mode (Note 12) 0.8 dB

Gain Variation Over Temperature TA = -40°C to +85°C 0.3 1.2 dB

Gain Step 12.7 dB

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 3.2 µs

PARAMETER CONDITIONS MIN TYP MAX UNIT

R

BIAS

R

BIAS

Low-gain mode (Note 12) 7.2

High-gain mode (Note 11) -7

Low-gain mode (Note 12) -1.2

High-gain mode (Note 11) 1.9 2.4

Low-gain mode (Note 12) 10.8

High-gain mode (Note 11) 14.4

Low-gain mode (Note 12) 19.3

High-gain mode (Note 11) 10.7

Low-gain mode (Note 12) 7.3

High-gain mode (Note 11) 28

Low-gain mode (Note 12) 25

= 511Ω ± 1% 1.5

= 715Ω ± 1% -3

dBm

dBm

dB

dB

dB

dB

MAX2654/MAX2655/MAX2656

1575MHz/1900MHz Variable-IP3

Low-Noise Amplifiers

Typical Operating Characteristics

(PIN= -30dBm, input and output are terminated to 50Ω, VCC= +3V, high-gain and low-gain modes are applicable only to the MAX2656,
T

A

= +25°C, unless otherwise noted.)

0

1

2

3

4

5

6

7

8

23456

MAX2654

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX2654 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

TA = -40°C

TA = +25°C

TA = +85°C

40

45

50

55

60

-40 0 20-20 40 60 80

MAX2654

INPUT LOGIC CURRENT vs. TEMPERATURE

MAX2654 toc05

TEMPERATURE (°C)

INPUT LOGIC CURRENT (µA)

INPUT LOGIC LOW AT V

RFOUT

0

6

4

2

8

10

14

12

16

1000 1200 1400 1600 1800 2000 2200

MAX2654

GAIN vs. FREQUENCY

MAX2654 toc07

FREQUENCY (MHz)

GAIN (dB)

1.6

2.0

1.8

2.2

2.8

3.0

2.6

2.4

3.2

1000 1200 1400 1600 1800 2000

MAX2654

NOISE FIGURE vs. FREQUENCY

MAX2654 toc09

FREQUENCY (MHz)

NOISE FIGURE (dB)

0

4

6

7

8

-40 0 20-20 40 60 80

MAX2654

INPUT LOGIC CURRENT vs. TEMPERATURE

MAX2654 toc04

TEMPERATURE (°C)

INPUT LOGIC CURRENT (µA)

INPUT LOGIC HIGH AT V

RFOUT

10

11

13

12

14

15

2.0 3.0 3.52.5 4.0 4.5 5.0 5.5 6.0

MAX2654

GAIN vs. SUPPLY VOLTAGE

MAX2654 toc08

SUPPLY VOLTAGE (V)

GAIN (dB)

f0 = 1575MHz

TA = +85°C

TA = +25°C

TA = -40°C

4

6

8

10

12

14

-40 -20 0 20 40 8060

MAX2654

SHUTDOWN CURRENT vs. TEMPERATURE

MAX2654 toc02

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

2

0

VCC = +6V

VCC = +3V

-40 0-20 20 40 60 80

MAX2654

INPUT LOGIC VOLTAGE vs. TEMPERATURE

MAX2654 toc03

TEMPERATURE (°C)

INPUT LOGIC VOLTAGE (V)

0.5

1.0

1.5

2.0

INPUT LOGIC HIGH AT V

RFOUT

INPUT LOGIC LOW AT V

RFOUT

_______________________________________________________________________________________ 5

INPUT IP3 vs. TEMPERATURE

-6

f1 = 1570 MHz

= 1580 MHz

f

2

-7

MAX2654

MAX2654 toc06

-8

INPUT IP3 (dBm)

-9

-10

-40 20 40-20 0 60 80
TEMPERATURE (°C)