1

®

FN6390.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL28271, ISL28272

Dual Micropower, Single Supply, Rail-to-

Rail Input and Output (RRIO)

Instrumentation Amplifier

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.

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)

Applications

• Battery- or solar-powered systems

• Strain gauge

• Sensor signal conditioning

• Medical devices

• Industrial instrumentations

Related Literature

• AN1290, ISL2827xINEVAL1Z Evaluation Board User’s

Guide

• AN1298, Instrumentation Amplifier Application Note

Ordering Information

PART NUMBER

(Note)

PART

MARKING

PACKAGE

(Pb-free)

PKG. DWG. #

ISL28271FAZ*

28271 FAZ

16 Ld QSOP MDP0040

ISL28272FAZ*

28272 FAZ

16 Ld QSOP MDP0040

ISL28271INEVAL1Z

Evaluation Platform

ISL28272INEVAL1Z

Evaluation Platform

*Add “-T7” suffix for tape and reel. Please refer to TB347 for details

on reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach

materials and 100% matte tin plate PLUS ANNEAL - e3 termination

finish, which is RoHS compliant and compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J STD-020.

Pinout

ISL28271, ISL28272

(16 LD QSOP)

TOP VIEW

NC

OUT_A

FB+_A

FB-_A

IN-_A

IN+_A

EN_A

V-

V+

FB+_B

FB-_B

IN-_B

IN+_B

NC

OUT_B

EN_B

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

-+

-

+

Data Sheet

August 17, 2007