AD605BR

双通道，低噪声，单电源可变增益放大器 Dual, Low Noise, Single-Supply Variable Gain Amplifier

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