Rainbow Electronics MAX2057 User Manual

General Description

The MAX2057 general-purpose, high-performance vari­able-gain amplifier (VGA) is designed to operate in the
1700MHz to 2500MHz frequency range*. This device
features 15.5dB of gain, 6dB of noise figure, and an out­put 1dB compression point of 23.8dBm. The MAX2057
also provides an exceptionally high OIP3 level of
37dBm, which is maintained over the entire attenuation
range. In addition, the on-chip analog attenuators yield
infinite control and high attenuation accuracy over
selectable 21dB or 42dB control ranges. Each of these
features makes the MAX2057 an ideal VGA for
DCS/PCS, cdma2000™, W-CDMA, and PHS/PAS trans­mitter and power amplifier AGC circuits.

The MAX2057 is pin compatible with the MAX2056
800MHz to 1000MHz VGA, making this family of ampli­fiers ideal for applications where a common PC board
layout is used for both frequency bands.

The MAX2057 operates from a single +5V supply and is
available in a compact 36-pin thin QFN package (6mm
x 6mm x 0.8mm) with an exposed paddle. Electrical
performance is guaranteed over the extended -40°C to
+85°C temperature range.

Applications

DCS 1800/PCS 1900 2G and 2.5G EDGE Base­Station Transmitters and Power Amplifiers

cdmaOne™, cdma2000, Base-Station
Transmitters and Power Amplifiers

UMTS/W-CDMA and Other 3G Base-Station
Transmitters and Power Amplifiers

PHS/PAS Base-Station Transmitters and Power
Amplifiers

Transmitter Gain Control

Receiver Gain Control

Broadband Systems

Automatic Test Equipment

Digital and Spread-Spectrum Communication
Systems

Microwave Terrestrial Links

cdmaOne is a trademark of CDMA Development Group.
cdma2000 is a registered trademark of Telecommunications
Industry Association.

Features

♦ 1700MHz to 2500MHz RF Frequency Range*

♦ 37dBm Constant OIP3 (Over All Gain Settings)

♦ 23.8dBm Output 1dB Compression Point

♦ 15.5dB Typical Gain at Maximum Gain Setting

♦ 0.5dB Gain Flatness Over 100MHz Bandwidth

♦ 6dB Noise Figure at Maximum Gain Setting (Using

1 Attenuator)

♦ Two Gain-Control Ranges: 21dB and 42dB

♦ Analog Gain Control

♦ Single +5V Supply Voltage

♦ Pin Compatible with MAX2056, 800MHz to

1000MHz RF VGA

♦ External Current-Setting Resistors Provide Option

for Operating VGA in Reduced-Power/Reduced­Performance Mode

♦ Lead-Free Package Available

*Note: Operation beyond this range is possible, but has not been
characterized.

MAX2057

1700MHz to 2500MHz Variable-Gain

Amplifier with Analog Gain Control

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3510; Rev 0; 1/05

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.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

PKG

CODE

M AX 2057E TX

6mm x 6mm

T3666-2

M AX 2057E TX - T

6mm x 6mm

T3666-2

M AX 2057E TX + D

6mm x 6mm

T3666-2

M AX 2057E TX + TD

6mm x 6mm

T3666-2

**EP = Exposed paddle.
+ = Lead (Pb) free.
D = Dry pack.

-T = Tape-and-reel package.

Pin Configuration/Functional Diagram appear at end of data
sheet.

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

36 Thin QFN-EP**

36 Thin QFN-EP**

36 Thin QFN-EP**

36 Thin QFN-EP**

MAX2057

1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control

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 +5.5V

V

CNTL

to GND (with VCCapplied) .............................0V to 4.75V

Current into V

CNTL

pin (VCCgrounded) .............................40mA

All Other Pins to GND.................................-0.3V to (V

CC

+ 0.3V)

RF Input Power (IN, IN_A, ATTN_OUT, OUT_A) ...........+20dBm

RF Input Power (AMP_IN)...............................................+12dBm

θJA(natural convection)...................................................35°C/W

θ

JA

(1m/s airflow) .............................................................31°C/W

θ

JA

(2.5m/s airflow) ..........................................................29°C/W

θ

JC

(junction to exposed paddle) ....................................10°C/W

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V, no RF signals applied, all input and output ports terminated with 50Ω, TA= -40°C to +85°C, unless other­wise noted. Typical values are at V

CC

= +5.0V, TA= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS

UNITS

Supply Voltage

5

V

Supply Current R1 = 1.2kΩ, R2 = 2kΩ (Note 1)

230 mA

R

SET1

Current R1 = 1.2kΩ (Note 1) 1 mA

R

SET2

Current R1 = 2kΩ (Note 1) 0.6 mA

Gain-Control Voltage Range (Note 2) 1.0 4.5 V

Gain-Control Pin Input Resistance

V

CNTL

= 1V to 4.5V

kΩ

AC ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit with one attenuator connected, VCC= +4.75V to +5.25V, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at V

CC

= +5.0V, R1 = 1.2kΩ, R2 = 2kΩ, P

OUT

= +5dBm, fIN= 2100MHz, V

CNTL

= 1V, 50Ω system impedance,

second attenuator is not connected, T

A

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

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

Frequency Range

MHz

Gain TA = +25°C

dB

V

CNTL

= 1V

V

CNTL

= 1.8V

V

CNTL

= 2.6V

TA = +25°C to -40°C

V

CNTL

= 3.5V

V

CNTL

= 1V -1

V

CNTL

= 1.8V

V

CNTL

= 2.6V

Maximum Gain Variation

T

A

= +25°C to +85°C

V

CNTL

= 3.5V

dB

Reverse Isolation 37 dB

Noise Figure (Note 4) 6 dB

Output 1dB Compression Point

dBm

Output 2nd-Order Intercept Point

From maximum gain to 15dB attenuation, measured at f

1

+ f2 (Note 5)

dBm

Output 3rd-Order Intercept Point

From maximum gain to 15dB attenuation (Note 5)

dBm

MIN TYP MAX

4.75

180

5.25

250 500

1700 2500

13.5 15.5 17.5

+0.9

+0.41

+0.09

-0.16

-0.56

-0.32

+0.1

+23.8

+64

+37

MAX2057

1700MHz to 2500MHz Variable-Gain

Amplifier with Analog Gain Control

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuit with one attenuator connected, VCC= +4.75V to +5.25V, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at V

CC

= +5.0V, R1 = 1.2kΩ, R2 = 2kΩ, P

OUT

= +5dBm, fIN= 2100MHz, V

CNTL

= 1V, 50Ω system impedance,

second attenuator is not connected, T

A

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

Note 1: Total supply current reduces as R1and R2are increased.
Note 2: Operating outside this range for extended periods may affect device reliability. Limit pin input current to 40mA when V

CC

is not present.

Note 3: All limits include external component losses, unless otherwise noted.
Note 4: Noise figure increases by approximately 1dB for every 1dB of gain reduction.
Note 5: f

1

= 2100MHz, f2= 2101MHz, +5dBm/tone at OUT.

Note 6: Switching time is measured from 50% of the control signal to when the RF output settles to ±1dB.

PARAMETER CONDITIONS

UNITS

TA = +25°C to +85°C

Output 3rd-Order Intercept Point
Variation Over Temperature

T

A

= +25°C to -40°C

dB

2nd Harmonic

-65 dBc

3rd Harmonic

-83 dBc

One attenuator 17

RF Gain-Control Range

f

RF

= 1.7GHz to 2.2GHz,

V

CNTL

= 1V to 4.5V

Two attenuators 34

dB

RF Gain-Control Slope V

CNTL

= 1.8V to 3.5V -10

dB/V

Maximum RF Gain-Control Slope

Maximum slope vs. gain-control voltage

dB/V

Gain Flatness Over
100MHz Bandwidth

Peak-to-peak for all settings 0.5 dB

Attenuator Switching Time 15dB attenuation change (Note 6)

ns

Attenuator Insertion Loss Second attenuator (IN_A, OUT_A) 2.2 dB

Input Return Loss Entire band, all gain settings 18 dB

Output Return Loss Entire band, all gain settings 15 dB

Group Delay Input/output 50Ω lines de-embedded

ps

Group Delay Flatness Over
100MHz Bandwidth

Peak to peak 20 ps

Group Delay Change vs. Gain
Control

V

CNTL

= 1V to 4V -70 ps

Insertion Phase Change vs. Gain
Control

V

CNTL

= 1V to 4V 50

degrees

From maximum gain to 15dB attenuation, P

From maximum gain to 15dB attenuation, P

OUT

OUT

= +5dBm

= +5dBm

MIN TYP MAX

-0.83

-0.6

20.7

42.4

-15.2

500

300

MAX2057

1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control

4 _______________________________________________________________________________________

GAIN vs. GAIN-CONTROL VOLTAGE

MAX2057 toc04

V

CNTL

(V)

GAIN (dB)

3.53.02.52.01.5

-5

0

5

10

15

20

-10

1.0 4.0

TA = +25°C

TA = -40°C

TA = +85°C

GAIN vs. RF FREQUENCY

MAX2057 toc05

RF FREQUENCY (MHz)

GAIN (dB)

2300210019001700

11

13

15

17

19

9

1500 2500

TA = -40°C

TA = +25°C

TA = +85°C

REVERSE ISOLATION

vs. RF FREQUENCY

MAX2057 toc06

RF FREQUENCY (MHz)

REVERSE ISOLATION (dB)

2300210019001700

30

35

40

25

1500 2500

TA = +25°C

TA = +85°C

TA = -40°C

INPUT RETURN LOSS

vs. RF FREQUENCY

MAX2057 toc07

RF FREQUENCY (MHz)

INPUT RETURN LOSS (dB)

230021001700 1900

35

30

25

20

15

10

5

0

40

1500 2500

MAX GAIN

3dB GAIN REDUCTION

6dB GAIN REDUCTION

9dB, 12dB, 15dB, 18dB

GAIN REDUCTION

OUTPUT RETURN LOSS

vs. RF FREQUENCY

MAX2057 toc08

RF FREQUENCY (MHz)

OUTPUT RETURN LOSS (dB)

230021001700 1900

35

30

25

20

15

10

5

0

40

1500 2500

MAX GAIN, 3dB, 6dB, 9dB, 12dB,

15dB, AND 18dB GAIN REDUCTION

GAIN vs. RF FREQUENCY

MAX2057 toc09

RF FREQUENCY (MHz)

GAIN (dB)

2300210019001700

-5

0

5

10

15

20

-10
1500 2500

MAXIMUM GAIN

18dB GAIN REDUCTION

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX2057 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

5.1255.0004.875

160

170

180

190

200

150

4.750 5.250

TA = +85°C

TA = +25°C

TA = -40°C

INPUT RETURN LOSS

vs. RF FREQUENCY

MAX2057 toc02

RF FREQUENCY (MHz)

INPUT RETURN LOSS (dB)

230021001700 1900

35

30

25

20

15

10

5

0

40

1500 2500

TA = +85°C

TA = +25°C

TA = -40°C

OUTPUT RETURN LOSS

vs. RF FREQUENCY

MAX2057 toc03

RF FREQUENCY (MHz)

OUTPUT RETURN LOSS (dB)

230021001700 1900

35

30

25

20

15

10

5

0

40

1500 2500

TA = +25°C

TA = -40°C

TA = +85°C

Typical Operating Characteristics

One Attenuator Configuration

(Typical Application Circuit with one attenuator connected, VCC= +5.0V, R1 = 1.2kΩ, R2 = 2kΩ, fIN= 2100MHz, maximum gain
setting, P

OUT

= +5dBm, linearity measured at P

OUT

= +5dBm/tone, TA= +25°C, unless otherwise noted.)