Circuit Note

CN-0046

Rev. A | Page 3 of 3

COMMON VARIATIONS

Placing antialiasing filters between the ADC and the amplifier

is a common approach for improving overall noise and

broadband distortion performance for both band-pass and low-

pass applications. For high frequency filtering, matching to the

filter is required. The AD8352 maintains a 100 Ω output

impedance well beyond most applications and is well-suited

to drive most filter configurations with little or no

degradation in distortion.

The AD8352 low distortion differential amplifier can be

replaced by the high IP3, low noise figure AD8375 variable gain

amplifier (VGA). The AD8375 is a digitally controlled, variable

gain, wide bandwidth amplifier that provides precise gain

control across a broad 24 dB gain range, with 1 dB resolution.

The AD8376 is a dual version of the AD8375. (See Circuit Note

CN-0002, Using the AD8376 VGA to Drive Wide Bandwidth

ADCs for High IF AC-Coupled Applications.)

LEARN MORE

CN-0002 Circuit Note, Using the AD8376 VGA to Drive Wide

Bandwidth ADCs for High IF AC-Coupled Applications.

Analog Devices.

MT-031 Tutorial, Grounding Data Converters and Solving the

Mystery of AGND and DGND. Analog Devices.

MT-073 Tutorial, High Speed Variable Gain Amplifiers (VGAs).

Analog Devices.

MT-075 Tutorial, Differential Drivers for High Speed ADCs

Overview. Analog Devices.

MT-101 Tutorial, Decoupling Techniques. Analog Devices.

Data Sheets

AD8352 Data Sheet.

AD8375 Data Sheet.

AD8376 Data Sheet.

AD9445 Data Sheet.

AD9445 Evaluation Board.

High Speed ADC Evaluation Kits and Evaluation Boards.

REVISION HISTORY

8/09—Rev. 0 to Rev. A

Updated Format ................................................................. Universal

10/08—Revision 0: Initial Version

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CN08446-0-8/09(A)