GENERAL DESCRIPTION
The AD600/AD6021 dual-channel, low noise, variable gain amplifiers are optimized for use in ultrasound imaging systems but are applicable to any application requiring precise gain, low noise and distortion, and wide bandwidth. Each independent channel provides a gain of 0 dB to +40 dB in the AD600 and −10 dB to +30 dB in the AD602. The lower gain of the AD602 results in an improved signal-to-noise ratio (SNR) at the output. However, both products have the same 1.4 nV/√Hz input noise spectral density. The decibel gain is directly proportional to the control voltage, accurately calibrated, and supply and temperature stable.

FEATURES
    2 channels with independent gain control Linear in dB gain response
    2 gain ranges AD600: 0 dB to 40 dB AD602: –10 dB to +30 dB
    Accurate absolute gain: ±0.3 dB
    Low input noise: 1.4 nV/√Hz
    Low distortion: −60 dBc THD at ±1 V output
    High bandwidth: dc to 35 MHz (−3 dB)
    Stable group delay: ±2 ns
    Low power: 125 mW (maximum) per amplifier
    Signal gating function for each amplifier
    Drive high speed ADCs
    MIL-STD-883-compliant and DESC versions available

APPLICATIONS
    Ultrasound and sonar time-gain controls
    High performance audio and RF AGC systems
    Signal measurement