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AD605

Analog Devices
Part Number AD605
Manufacturer Analog Devices
Description Dual/ Low Noise/ Single-Supply Variable Gain Amplifier
Published Mar 23, 2005
Detailed Description www.DataSheet4U.com a FEATURES Two Independent Linear-in-dB Channels Input Noise at Maximum Gain: 1.8 nV/ √Hz , 2.7 pA/...
Datasheet PDF File AD605 PDF File

AD605
AD605

Overview
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, single supply, exponential amplifier (DSX-AMP) architecture.
Each of the DSX-AMPs comprise a variable attenuator of 0 dB to –48.
4 dB followed by a high speed fixed gain amplifier.
The attenuator is based on a 7-stage R-1.
5R ladder network.
The attenuation between tap points is 6.
908 dB, and 48.
360 dB for the entire ladder network.
The DSX-AMP architecture results in 1.
8 nV/√Hz input noise spectral density and will accept a ± 2.
0 V input signal when VOCM is biased at VP/2.
Each independent channel o...


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