1

Dual and Quad Micropower Single Supply Rail-to-Rail

Input and Output (RRIO) Op Amp

ISL28288, ISL28488

The ISL28288 and ISL28488 are dual and quad channel

micropower operational amplifiers optimized for single supply

operation over the 2.4V to 5.5V range. They can be operated

from one lithium cell or two Ni-Cd batteries. For equivalent

performance in a single channel op amp, reference EL8188.

These devices feature an Input Range Enhancement Circuit

(IREC) which enables them to maintain CMRR performance for

input voltages 10% above the positive supply rail and to

100mV below the negative supply. The output operation is

rail-to-rail.

The ISL28288 and ISL28488 draw minimal supply current

while meeting excellent DC-accuracy, AC-performance, noise

and output drive specifications. The ISL28288 (10 Ld MSOP

only) contains a power-down enable pin that reduces the

power supply current to typically less than 4µA in the disabled

state.

Related Literature

AN1344: ISL2828xEVAL1Z Evaluation Board User’s Guide

Features

• Low power 60µA typical supply current per amplifier

• 1.5mV max offset voltage

• 30pA max input bias current

• 250kHz typical gain-bandwidth product

• 105dB typical PSRR

• 100dB typical CMRR

• Single supply operation down to 2.4V

sensing)

• Rail-to-rail input and output (RRIO)

• Enable Pin - ISL28288 10 Ld MSOP package option only

• Pb-free (RoHS compliant)

Applications

• Battery- or solar-powered systems

• 4mA to 25mA current loops

• Handheld consumer products

•Medical devices

• Thermocouple amplifiers

• Photodiode pre-amps

• pH probe amplifiers

FIGURE 1. TYPICAL APPLICATION CIRCUIT

+

-

R1

10k

158

Ω

+

-

CF1

4.7µF

R3

12.4k

R4

2.21k

C1

0.1µF

C3

0.082µF

VOUT

U1A

1/2

ISL28x88

U1B

1/2

ISL28x88

RF1

680k

R2

VIN

BANDPASS AMPLIFIER (0.05Hz TO 159Hz)

GAIN=425

VREF

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

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

July 26, 2011

FN6339.4