1

®

FN6293.1

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

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EL8171, EL8172

Micropower, Single Supply, Rail-to-Rail

Input-Output Instrumentation Amplifiers

The EL8171 and EL8172 are micropower instrumentation

amplifiers optimized for operation at 2.9V to 5V single

supplies. Inputs and outputs can operate rail-to-rail. As with

all instrumentation amplifiers, a pair of inputs provide very

high common-mode rejection and are completely

independent from a pair of feedback terminals. The

feedback terminals allow zero input to be translated to any

output offset, including ground. A feedback divider controls

the overall gain of the amplifier.

The EL8172 is compensated for a gain of 100 or more, and

the EL8171 is compensated for a gain of 10 or more. The

EL8171 and EL8172 have PMOS input devices that provide

sub-nA input bias currents.

The amplifiers can be operated from one lithium cell or two

Ni-Cd batteries. The EL8171 and EL8172 input range goes

from below ground to slightly above positive rail. The output

stage swings completely to ground or positive supply - no

pull-up or pull-down resistors are needed.

Pinout

EL8171, EL8172

(8 LD SO)

TOP VIEW

Features

• 78µA maximum supply current

• Maximum input offset voltage

- 300µV (EL8172)

- 1000µV (EL8171)

• 200pA maximum input bias current

• 3µV/°C offset voltage drift

• 450kHz -3dB bandwidth (G = 10)

• 170kHz -3dB bandwidth (G = 100)

• 0.5V/µs slew rate

• Single supply operation

- Input voltage range is rail-to-rail

- Output swings rail-to-rail

• Output sources and sinks ±29mA load current

• 0.2% gain accuracy

• Pb-free plus anneal available (RoHS compliant)

Applications

• Battery- or solar-powered systems

• Strain gauges

• Current monitors

• Thermocouple amplifiers

1

2

3

4

8

7

6

5

Σ

+

-

+

-

ENABLE

IN-

IN+

VS-

FB+

VS+

FB-

OUT

Data Sheet

March 9, 2006