Rainbow Electronics MAX2056 User Manual

General Description

The MAX2056 general-purpose, high-performance vari­able-gain amplifier (VGA) is designed to operate in the
800MHz to 1000MHz frequency range*. This device fea­tures 15.5dB of gain, 4.5dB of noise figure, and an out­put 1dB compression point of 23.5dBm. The MAX2056
also provides an exceptionally high OIP3 level of
39dBm, which is maintained over the entire attenuation
range. In addition, the on-chip analog attenuators yield
infinite control and high attenuation accuracy over
selectable 22dB or 44dB control ranges. Each of these
features makes the MAX2056 an ideal VGA for cellular
band GSM, cdma2000®, W-CDMA, and iDEN®transmit­ter and power amplifier AGC circuits.

The MAX2056 is pin compatible with the MAX2057
1700MHz to 2500MHz VGA, making this family of
amplifiers ideal for applications where a common PC
board layout is used for both frequency bands.

The MAX2056 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 pad. Electrical per­formance is guaranteed over the extended -40°C to
+85°C temperature range.

Applications

GSM 850/GSM 900 2G and 2.5G EDGE Base­Station Transmitters and Power Amplifiers

Cellular cdmaOne™, cdma2000, and Integrated
Digital Enhanced Network (iDEN) Base-Station
Transmitters and Power Amplifiers

W-CDMA 850MHz and Other 3G 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.
iDEN is a registered trademark of Motorola, Inc.

Features

♦ 800MHz to 1000MHz RF Frequency Range*

♦ 39dBm Constant OIP3 (Over All Gain Settings)

♦ 23.5dBm Output 1dB Compression Point

♦ 15.5dB Typical Gain at Maximum Gain Setting

♦ 0.15dB Gain Flatness Over 100MHz Bandwidth

♦ 4.5dB Noise Figure at Maximum Gain Setting

(Using 1 Attenuator)

♦ Two Gain-Control Ranges: 22dB and 44dB

♦ Analog Gain Control

♦ Single +5V Supply Voltage

♦ Pin Compatible with MAX2057, 1700MHz to

2500MHz 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.

MAX2056

800MHz to 1000MHz Variable-Gain

Amplifier with Analog Gain Control

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3508; Rev 0; 2/05

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

MAX2056ETX

T3666-2

MAX2056ETX-T

6m m x 6m m

T3666-2

MAX2056ETX+D

T3666-2

M AX 2056E TX + TD

T3666-2

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

T = Tape-and-reel package.

Pin Configuration/Functional Diagram appears 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 **

6m m x 6m m

36 Thin QFN -EP **

36 Thin QFN -EP **

6m m x 6m m

36 Thin QFN -EP **

6m m x 6m m

MAX2056

800MHz to 1000MHz 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)................................0 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

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 = 3.92kΩ, P

OUT

= +5dBm, fIN= 900MHz, V

CNTL

= 1V, 50Ω system impedance,

second attenuator is not connected, T

A

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

PARAMETER CONDITIONS

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

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 29 dB

Noise Figure (Note 4) 4.5 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

dBm

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 = 3.92kΩ (Note 1)

167 mA

R

SET1

Current R1 = 1.2kΩ (Note 1) 1 mA

R

SET2

Current R2 = 3.92kΩ (Note 1)

mA

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

Gain-Control Pin Input Resistance V

CNTL

= 1V to 4.5V

kΩ

MIN TYP MAX

4.75

136

0.33

5.25

250 500

From maximum gain to 15dB attenuation (Note 5) +39

MIN TYP MAX

800 1000

15.5

+0.82

+0.26

+0.25

-0.18

-0.51

-0.11

-0.16

+0.09

+23.5

+54

MAX2056

800MHz to 1000MHz 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 = 3.92kΩ, P

OUT

= +5dBm, fIN= 900MHz, 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 R1 and R2 are 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

= 900MHz, f2= 901MHz, +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

MIN

TYP

MAX

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

From maximum gain to 15dB attenuation, P

OUT

=

+5dBm

-55 dBc

3rd Harmonic

From maximum gain to 15dB attenuation, P

OUT

=

+5dBm

-68 dBc

One attenuator

RF Gain-Control Range

f

RF

= 800MHz to 1000MHz,

V

CNTL

= 1V to 4.5V

Two attenuators

dB

RF Gain-Control Slope

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

dB

Attenuator Switching Time 15dB attenuation change (Note 6)

ns

Attenuator Insertion Loss Second attenuator (IN_A, OUT_A) 1.7 dB

Input Return Loss Entire band, all gain settings 15 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

ps

Group Delay Change vs. Gain Control V

CNTL

= 1V to 4V

ps

Insertion Phase Change vs. Gain Control

V

CNTL

= 1V to 4V 20

degrees

-0.46

+1.35

18.3 22.3

36.6 44.6

-10.7

-17.2

0.15

500

600

100

100

MAX2056

800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control

4 _______________________________________________________________________________________

Typical Operating Characteristics

One Attenuator Configuration

(Typical Application Circuit with one attenuator connected, VCC= +5.0V, R1 = 1.2kΩ, R2 = 3.92kΩ, fIN= 900MHz maximum gain
setting, P

OUT

= +5dBm, linearity measured at P

OUT

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

100

120

110

140

130

150

160

4.750 5.0004.875 5.125 5.250

SUPPLY CURRENT vs. V

CC

MAX2056 toc01

VCC (V)

SUPPLY CURRENT (mA)

TA = +85°C

TA = +25°C

TA = -40°C

30

25

20

15

10

5

0

700 900800 1000 1100 1200 1300 1400 1500

INPUT RETURN LOSS

vs. RF FREQUENCY

MAX2056 toc02

RF FREQUENCY (MHz)

INPUT RETURN LOSS (dB)

TA = +85°C

TA = +25°C

TA = -40°C

MAX2056 toc03

TA = +85°C

TA = +25°C

TA = -40°C

30

25

20

15

10

5

0

700 900800 1000 1100 1200 1300 1400 1500

OUTPUT RETURN LOSS

vs. RF FREQUENCY

RF FREQUENCY (MHz)

OUTPUT RETURN LOSS (dB)

GAIN vs. V

CNTL

MAX2056 toc04

V

CNTL

(V)

GAIN (dB)

3.53.02.52.01.5

-5

0

5

10

15

20

-10

1.0 4.0

TA = +85°C

TA = +25°C

TA = -40°C

11

12

13

14

15

16

17

GAIN vs. RF FREQUENCY

MAX2056 toc05

GAIN (dB)

TA = +85°C

TA = +25°C

TA = -40°C

700 900800 1000 1100 1200 1300 1400 1500

RF FREQUENCY (MHz)

20

25

30

35

REVERSE ISOLATION

vs. RF FREQUENCY

MAX2056 toc06

ISOLATION (dB)

TA = +85°C

TA = +25°C

TA = -40°C

700 900800 1000 1100 1200 1300 1400 1500

RF FREQUENCY (MHz)

30

25

20

15

10

5

0

INPUT RETURN LOSS

vs. RF FREQUENCY

MAX2056 toc07

INPUT RETURN LOSS (dB)

700 900800 1000 1100 1200 1300 1400 1500

RF FREQUENCY (MHz)

MAXIMUM GAIN

21dB GAIN REDUCTION

MAX2056 toc08

30

25

20

15

10

5

0

OUTPUT RETURN LOSS

vs. RF FREQUENCY

OUTPUT RETURN LOSS (dB)

700 900800 1000 1100 1200 1300 1400 1500

RF FREQUENCY (MHz)

MAXIMUM GAIN

21dB GAIN REDUCTION

-17

-7

-12

3

-2

8

13

18

23

MAX2056 toc09

GAIN (dB)

GAIN vs. RF FREQUENCY

700 900800 1000 1100 1200 1300 1400 1500

RF FREQUENCY (MHz)

MAXIMUM GAIN

22dB GAIN REDUCTION