VG025
High Linearity Variable Gain Amplifier
The Communications Edge
TM
Product Information
Product Features
x
Tunable within 50 – 2200 MHz
x
21 dB Attenuation Range
x
Constant +40 dBm OIP3 and +21
dBm P1dB over all gain settings
x
Single +5V Supply Voltage
x
MTTF > 1000 years
x
16-pin 4x4mm lead-free/green/
RoHS-compliant QFN Package
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
N/C
14
N/C
16
N/C 1
N/C 2
N/C 3
RF IN 4
5
N/C
6
Interstage
Match
7
N/C
8
Gain
Control
15
N/C
13
12 RF OUT
11 N/C
10
Interstage
Match
N/C
9 N/C
Applications
x
AGC circuitry
x
Temperature compensation circuits
x
DCS/PCS, cdma2000
TM,
W-CDMA
Function
RF Input
Gain Control
Interstage Match
RF Output / DC bias
No Connect or GND
Ground
Pin Number
4
8
6, 10
12
All other pins
Backside slug
Specifications
(1)
Parameter
Operational Bandwidth
Test Frequency
Gain
(2)
Input Return Loss
(2)
Output Return Loss
(2)
Output P1dB
Output IP3
(3)
Noise Figure
(2)
Gain Variation Range
(4)
Gain Variation Control Voltage
(5)
Supply Voltage
Operating Current Range
Gain Control Pin Current
Typical Performance
(1)
Units Min
MHz
MHz
dB
dB
dB
dBm
dBm
dB
dB
V
V
mA
mA
50
13.5
800
15
6.3
7.6
21.3
39
5.3
21
5
150
26
Typ
Max
2200
Parameter
Frequency
Gain
(2)
Input Return Loss
(2)
Output Return Loss
(2)
Output P1dB
Output IP3
(3)
Noise Figure
(2)
Gain Variation Range
Units
MHz
dB
dB
dB
dBm
dBm
dB
dB
240
15.4
11
11
21.8
42
4.5
20
Typical
800
15
6.3
7.6
21.3
39
5.3
21
1960
8.4
12
6.5
22
40
8.1
14
2140
8.4
11
5.6
22
40
8.2
13
37
16
0
120
24
4.5
180
28
1. Test conditions unless otherwise noted: 25ºC, Vsupply = +5 V, in tuned application circuit. Vctrl
is the control voltage through the 120 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.
5. This voltage refers to the V
CTRL
as shown in the circuit schematic on page 2. There should be a
series resistance of 120
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:
Absolute Maximum Rating
Parameter
Operating Case Temperature
Storage Temperature
Amplifier Supply Voltage (pin 12)
Pin 8 (Gain Control) Current
RF Input Power (continuous)
Junction Temperature
-40 to +85
qC
-55 to +125
qC
+6 V
30 mA
4 dB above Input P1dB
+220
qC
Rating
Ordering Information
Part No.
VG025-G
Description
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
Operation of this device above any of these parameters may cause permanent damage.
Specifications and information are subject to change without notice
WJ Communications, Inc
x
Phone 1-800-WJ1-4401
x
FAX: 408-577-6621
x
e-mail: sales@wj.com
x
Web site: www.wj.com
Page 1 of 7
September 2006
WJCI [ WJ COMMUNICATION. INC. ]
