100 MHz to 4000 MHz
RF/IF Digitally Controlled VGA
Data Sheet
ADL5243
FEATURES
GENERAL DESCRIPTION
Operating frequency from 100 MHz to 4000 MHz
Digitally controlled VGA with serial and parallel interfaces
6-bit, 0.5 dB digital step attenuator
31.5 dB gain control range with 0.25 dB step accuracy
Gain Block Amplifier 1
Gain: 19.2 dB at 2140 MHz
OIP3: 40.2 dBm at 2140 MHz
P1dB: 19.8 dBm at 2140 MHz
Noise figure: 2.9 dB at 2140 MHz
The ADL5243 is a high performance, digitally controlled
variable gain amplifier operating from 100 MHz to 4000 MHz.
The VGA integrates two high performance amplifiers and a
digital step attenuator (DSA). Amplifier 1 (AMP1) is an
internally matched gain block amplifier with 20 dB gain, and
Amplifier 2 (AMP2) is a broadband ¼ W driver amplifier. The
DSA is 6-bit with a 31.5 dB gain control range, 0.5 dB steps, and
0.25 dB step accuracy. The attenuation of the DSA can be
controlled using a serial or parallel interface.
¼ W Driver Amplifier 2
The gain block and DSA are internally matched to 50 Ω at their
inputs and outputs, and all three internal devices are separately
biased. The separate bias allows all or part of the ADL5243 to be
used, which allows for easy reuse throughout a design. The
pinout of the ADL5243 also enables the gain block, DSA, or
¼ W driver amplifier to be first, giving the VGA maximum
flexibility in a signal chain.
Gain: 14.2 dB at 2140 MHz
OIP3: 41.1 dBm at 2140 MHz
P1dB: 26.0 dBm at 2140 MHz
Noise figure: 3.7 dB at 2140 MHz
Gain block, DSA, or ¼ W driver amplifier can be first
Low quiescent current of 175 mA
The companion ADL5240 integrates a gain block with DSA
The ADL5243 consumes 175 mA and operates off a single
supply ranging from 4.75 V to 5.25 V. The VGA is packaged in a
thermally efficient, 5 mm × 5 mm, 32-lead LFCSP and is fully
specified for operation from −40°C to +85°C. A fully populated
evaluation board is available.
APPLICATIONS
Wireless infrastructure
Automated test equipment
RF/IF gain control
FUNCTIONAL BLOCK DIAGRAM
32
31
30
29
28
27
26
25
1
2
3
4
5
6
7
8
24
VDD
VDD
SERIAL/PARALLEL INTERFACE
NC
23 NC
NC
22 NC
DSAIN
21 DSAOUT
0.5dB
1dB
2dB
4dB
8dB
16dB
20
19
18
NC
NC
ADL5243
AMP1OUT/VCC
AMP2IN
NC
AMP2
15
NC
NC
AMP1
10
17 NC
9
11
12
13
14
16
Figure 1.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2011 Analog Devices, Inc. All rights reserved.
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