Datasheet

ISL28271
Dual Micropower, Single Supply, Rail-to-Rail Input and Output (RRIO) Instrumentation Amplifier

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Typical Diagram

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Key Features

120µA typical supply current for both channels
30pA max input bias current
100dB CMRR, PSRR
0.7µV/°C offset voltage temperature coefficient
180kHz 3dB Bandwidth - ISL28271
100kHz 3dB Bandwidth - ISL28272
0.5V/µs slew rate
Single supply operation
Rail-to-rail input and output (RRIO)
Input is capable of swinging above V+ and below V- (ground sensing)
0.081%1 typical gain error - ISL28271
-0.19%1 typical gain error - ISL28272
Pb-free available (RoHS compliant)

Description

The ISL28271 and ISL28272 are dual micropower instrumentation amplifiers (in-amps) optimized for single supply operation over the +2.4V to +5.5V range.

Both devices feature an Input Range Enhancement Circuit (IREC) which maintains CMRR performance for input voltages equal to the positive and negative supply rails. The input signal is capable of swinging 10% above the positive supply rail and to 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail-to-rail.

The ISL28271 is compensated for a minimum gain of 10 or more. For higher gain applications, the ISL28272 is compensated for a minimum gain of 100. The in-amps have CMOS input devices for maximum input common voltage range. The amplifiers can be operated from one lithium cell or two Ni-Cd batteries.