LPC661

Low Power CMOS Operational Amplifier

General Description

The LPC661 CMOS operational amplifier is ideal for opera-

tion from a single supply. It features a wide range of operat-

ing supply voltage from +5V to +15V, rail-to-rail output swing

and an input common-mode range that includes ground.

Performance limitations that have plagued CMOS amplifiers

in the past are not a problem with this design. Input V

drift, and broadband noise as well as voltage gain (into 100

k

Ω and 5 kΩ) are all equal to or better than widely accepted

bipolar equivalents, while the supply current requirement is

typically 55 µA.

This chip is built with National’s advanced Double-Poly

Silicon-Gate CMOS process.

See the LPC660 datasheet for a Quad CMOS operational

amplifier or the LPC662 data sheet for a Dual CMOS opera-

tional amplifier with these same features.

Features

(Typical unless otherwise noted)

n

Rail-to-rail output swing

n

Low supply current

55 µA

n

Specified for 100 k

Ω and5kΩ loads

n

High voltage gain

120 dB

n

Low input offset voltage

3 mV

n

Low offset voltage drift

1.3 µV/˚C

n

Ultra low input bias current

2 fA

n

Input common-mode range includes GND

n

Operating range from +5V to +15V

n

Low distortion

0.01% at 1 kHz

n

Slew rate

0.11 V/µs

Applications

n

High-impedance buffer

n

Precision current-to-voltage converter

n

Long-term integrator

n

High-impedance preamplifier

n

Active filter

n

Sample-and-Hold circuit

n

Peak detector

Application Circuits

10 Hz Bandpass Filter

DS011227-21

Q = 2.1

Gain = 18.9 dB

1 Hz Low-Pass Filter

(Maximally Flat, Dual Supply Only)

DS011227-23

August 2000

© 2000 National Semiconductor Corporation

DS011227

www.national.com