AD605

www.DataSheet4U.com a 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 Dual, Low Noise, Single-Supply Variable Gain Amplifier AD605 FUNCTIONAL BLOCK DIAGRAM FIXED GAIN AMPLIFIER +34.4dB OUT FBK VGN GAIN CONTROL AND SCALING PRECISION PASSIVE INPUT ATTENUATOR VREF VOCM +IN –IN DIFFERENTIAL ATTENUATOR 0 TO –48.4dB AD605 GENERAL DESCRIPTION m 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). The high performance linear-in-dB response of the AD605 is achieved with the differential input, sing...