GENERAL DESCRIPTION
The AD605 is a low noise, accurate, dual channel, linear-in-dB variable gain amplifier, which is 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 which provides user-determined gain scaling (dB/V).

FEATURES
   Two 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 A/D Converters Directly

APPLICATIONS
   Ultrasound and Sonar Time-Gain Control
   High Performance AGC Systems
   Signal Measurement