DC to 500 MHz,
Dual Digital Gain Trim Amplifier
AD8366
Preliminary Technical Data
FEATURES
Matched Pair of Differential Digitally-Controlled VGAs
Gain Range: 4.5 dB to 20.5 dB
Step 0.25 dB
FUNCTIONAL BLOCK DIAGRAM
Ch. A Data Enable
Ch. B Data Enable
Operating frequency
DC to 500MHz
800MHz 3-dB bandwidth
AD8366
NF 10.5 dB @ max. gain, 18dB @ min. gain at 10MHz
OIP3 36dBVrms at 10MHz
IAN
OAN
OAP
DC OFFSET
HD2, HD3 > 88dBc for 2Vpp output at 10MHz at max gain
Differential Input and Output
Adjustable output common-mode
Optional DC output offset correction
Serial/Parallel Port Programmable
Power-down Feature
CANCELLATION
IAP
VCMA
VCMB
IBP
OBP
OBN
Single 5V Supply Operation
DC OFFSET
CANCELLATION
IBN
APPLICATIONS
Baseband I/Q receivers
Diversity receivers
ADC drivers
CHANNEL
GAIN
CONTROL
W-CDMA/CDMA/CDMA2000/GSM
Point-to-(Multi)Point Radio
CATV
Wireless local loop
WiMax
B0 B1 B2 B3 B4 B5
Serial /
Parallel
Figure 1. Functional Block Diagram
GENERAL DESCRIPTION
The AD8366 is a matched pair of fully differential low-noise
and low-distortion digitally programmable variable gain
amplifiers. The gain of each amplifier can be programmed
separately or simultaneously over a range of 5 dB to 21 dB in
steps of 0.25 dB. The amplifier offers flat frequency
performance and group delay from DC out to 150 MHz,
independent of gain code.
The output common-mode defaults to Vps/2 but can be
programmed via pins VCMA and VCMB over a range of
voltages. The built-in DC-offset compensation loop can be
disabled if DC-coupled operation is desired. The high-pass
corner is defined by external capacitors on pins OFSA and
OFSB. The input common mode also defaults to Vps/2 but can
be driven from 1.2V to 3.4V.
The AD8366 offers excellent spurious-free dynamic range,
suitable for driving 12-bit ADCs. The NF at max gain is 10.5 dB
at 10 MHz and increases 2dB for every 4dB decrease in gain.
Over the entire gain range, the HD3 and HD2 are >88dBc for
2 V p-p at the output at 10 MHz into 500 Ω. The 2-tone
intermodulation distortion of -90dBc into 200 Ω translates to
an OIP3 of 43 dBm. The differential input impedance is 200 ꢀ
to provide a well-defined termination. The differential output is
voltage-mode with a low impedance of 30 ꢀ.
The digital interface allows for parallel or serial gain
programming. The AD8366 operates off a 4.5V to 5.5V supply
and consumes a supply current of 175mA. When disabled, it
consumes ~ 4mA. The AD8366 is fabricated using Analog
Devices’ advanced Silicon-Germanium bipolar process and is
available in a 32-lead exposed paddle LFCSP package.
Performance is specified over a -40oC to +85oC temperature
range.
Rev. PrC
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
©2008 Analog Devices, Inc. All rights reserved.
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