Specifications and information are subject to change without notice

WJ Communications, Inc

• Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: sales@wj.com • Web site: www.wj.com

Page 1 of 7

January 2006

VG025

High Linearity Variable Gain Amplifier

Product Information

The Communications Edge

TM

Product Features

dBm P1dB over all gain settings

RoHS-compliant QFN Package

Applications

Product Description

The VG025 is a high dynamic range variable gain

amplifier (VGA) capable of achieving an analog

attenuation range of up to 21 dB. The +21 dBm output

compression point and +40 dBm output intercept point

of the amplifier are maintained over the entire

attenuation range, making the VG025 ideal for use in

temperature compensation circuits or AGC loops.

The VG025 is available in a lead-free/green/RoHS-

compliant 16-pin 4x4mm QFN surface-mount package

with an exposed backside paddle to allow an MTTF

rating of over 1000 years at a mounting temperature of

+85º C. All devices are 100% RF & DC tested and

packaged on tape and reel for automated surface-mount

assembly.

Functional Diagram

Function

Pin Number

RF Input

4

Gain Control

8

Interstage Match

6, 10

RF Output / DC bias

12

No Connect or GND

All other pins

Ground

Backside slug

Specifications

(1)

Parameter

Units Min

Typ

Max

Operational Bandwidth

MHz

50

2200

Test Frequency

MHz

800

dB

13.5

15

dB

6.3

dB

7.6

Output P1dB

dBm

21.3

dBm

37

39

dB

5.3

dB

16

21

24

V

0

4.5

Supply Voltage

V

5

Operating Current Range

mA

120

150

180

Gain Control Pin Current

mA

26

28

1. Test conditions unless otherwise noted: 25ºC, Vsupply = +5 V, in tuned application circuit. Vctrl

is the control voltage through the 120

Ω dropping resistor as shown in the application circuit on page 2.

2. Specifications refer to the device at the maximum gain setting (Vctrl=0V). The input and output

return loss will be dramatically improved with an attenuation setting greater than 1 dB.

3. 3OIP measured with two tones at an output power of +5 dBm/tone separated by 10 MHz. The

suppression on the largest IM3 product is used to calculate the 3OIP using a 2:1 rule.

4. The gain variation range is measured as the difference in gain with Vctrl = 0 and 4.5V at 800 MHz.

series resistance of 120Ω between the control voltage and pin 8 for proper operation.

Absolute Maximum Rating

Parameter

Rating

Operating Case Temperature

-40 to +85

°C

Storage Temperature

-55 to +125

°C

Amplifier Supply Voltage (pin 12)

+6 V

Pin 8 (Gain Control) Current

30 mA

RF Input Power (continuous)

4 dB above Input P1dB

Junction Temperature

+220

°C

Operation of this device above any of these parameters may cause permanent damage.

Typical Performance

(1)

Parameter

Units

Typical

Frequency

MHz

240

800

1960

2140

dB

15.4

15

8.4

8.4

dB

11

6.3

12

11

dB

11

7.6

6.5

5.6

Output P1dB

dBm

21.8

21.3

22

22

dBm

42

39

40

40

dB

4.5

5.3

8.1

8.2

Gain Variation Range

dB

20

21

14

13

Ordering Information

Part No.

Description

VG025-G

High Linearity Variable Gain Amplifier

(lead-free/green/RoHS-compliant 4x4mm QFN package)

VG025-PCB240

240 MHz Evaluation Board

VG025-PCB800

800 MHz Evaluation Board

VG025-PCB2000 1.7 – 2.2 GHz Evaluation Board

1

2

3

4

12

11

10

9

16

15

14

13

5

6

7

8

RF OUT

N/C

Interstage

Match

N/C

N/C

N/C

N/C

RF IN