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