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

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December 2006

VG112

PCS/UMTS-band Variable Gain Amplifier

Product Features

attenuation range

6x6 mm QFN package

Applications

mobile infrastructure

Product Description

The VG112 is a PCS / UMTS-band high dynamic range

variable gain amplifier (VGA) housed in a low profile

Pb-free / green / RoHS-compliant surface-mount leadless

QFN package that measures 6 x 6 mm square.

The +30 dBm output compression point and +46 dBm

output intercept point of the amplifier are maintained over

the entire attenuation range, making the VG112 ideal for

use in transmitter and receiver AGC circuits. The high gain

of the dual-stage amplifier allows for more integration in a

transceiver board while requiring minimal printed circuit

board space.

Superior thermal design allows the product to have a

minimum MTTF rating of 100 years at a mounting

temperature of +85 ºC. All devices are 100% RF & DC

tested and packaged on tape and reel for automated surface-

mount assembly.

Functional Diagram

Specifications

(1)

Parameter

Units

Min

Typ

Max

Conditions

Operational Bandwidth

MHz

1800

2200

Test Frequency

MHz

2140

See note 1

Gain at min. attenuation

dB

20.5

23

Input Return Loss

dB

18

Output Return Loss

dB

8.2

Output P1dB

dBm

+30

Output IP3

dBm

+43

+46

See note 2

Noise Figure at min. attenuation

dB

8

Gain Variation Range

dB

23.5

28

See note 3

V

0

4.5

See note 1

V

+5

Operating Amplifier Current Range

mA

350

415

475

Pin 25

Gain Control Pin Current

mA

20

1. Test conditions unless otherwise noted: 25 ºC, Vcc = +5 V in a tuned application circuit. Vctrl is the control voltage through a 220 Ω dropping resistor as shown in the same application circuit.

2. 3OIP measured with two tones at an output power of +15 dBm/tone separated by 1 MHz. The suppression on the largest IM3 product is used to calculate the 3OIP using a 2:1 rule.

3. The gain variation range is measured as the difference in gain with Vctrl = 0V and Vctrl = 4.5V at 2.14 GHz.

Absolute Maximum Rating

Parameter

Rating

Operating Case Temperature

-40 to +85 °C

Storage Temperature

-55 to +125 °C

Pin 5 (Gain Control) Current

30 mA

Junction Temperature

+250 °C

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

Ordering Information

Part No.

Description

VG112-G

PCS/UMTS-band Variable Gain Amplifier

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

VG112-PCB

2140 MHz Fully Assembled Application Board

8

9

10

11

12

13

14

7

6

5

4

3

2

1

15

16

17

18

19

20

21

GND

Vcc1

GND

RF OUT /

Vcc2

GND

GND

GND

GND

GND

RF IN

GND

GND

GND

Variable

Attenuator

Amp

28

27

26

25

24

23

22

RF OUT /

Vcc2