AD8331-EVAL Datasheet PDF - ADI

●GENERAL DESCRIPTION

●The AD8331/AD8332/AD8334 are single-, dual-, and quad channel ultralow noise, linear-in-dB, variable gain amplifiers (VGAs). Optimized for ultrasound systems, they are usable as a low noise variable gain element at frequencies up to 120 MHz. Included in each channel are an ultralow noise preamplifier (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamplifier with adjustable output limiting.

●The LNA gain is 19 dB with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a signal source without compromising noise performance.

●FEATURES

●Ultralow noise preamplifier

●   Voltage noise = 0.74 nV/√Hz

●   Current noise = 2.5 pA/√Hz

●3 dB bandwidth

●   AD8331: 120 MHz

●   AD8332, AD8334: 100 MHz

●Low power

●   AD8331: 125 mW/channel

●   AD8332, AD8334: 145 mW/channel

●Wide gain range with programmable postamp

●   −4.5 dB to +43.5 dB

●   +7.5 dB to +55.5 dB

●Low output-referred noise: 48 nV/√Hz typical

●Active input impedance matching

●Optimized for 10-bit/12-bit ADCs

●Selectable output clamping level

●Single 5 V supply operation

●AD8332 and AD8334 available in lead frame chip scale package

●APPLICATIONS

●Ultrasound and sonar time-gain controls

●High performance AGC systems

●I/Q signal processing

●High speed, dual ADC drivers