GENERAL DESCRIPTION
The AD605 is a low noise, accurate, dual-channel, linear-in-dB variable gain amplifier (VGA), optimized for any application requiring high performance, wide bandwidth variable gain control. Operating from a single 5 V supply, the AD605 provides differential inputs and unipolar gain control for ease of use. Added flexibility is achieved with a user-determined gain range and an external reference input that provide user-determined gain scaling (dB/V).

FEATURES
  2 independent linear-in-dB channels
  Input noise at maximum gain: 1.8 nV/√Hz, 2.7 pA/√Hz
  Bandwidth: 40 MHz (–3 dB)
  Differential input
  Absolute gain range programmable
    –14 dB to +34 dB (FBK shorted to OUT) through
    0 dB to 48 dB (FBK open)
  Variable gain scaling: 20 dB/V through 40 dB/V
  Stable gain with temperature and supply variations
  Single-ended unipolar gain control
  Output common mode independently set
  Power shutdown at lower end of gain control
  Single 5 V supply
  Low power: 90 mW/channel
  Drives ADCs directly

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