LMV422

Dual Rail-to-Rail Output Operational Amplifier with

Power Select

General Description

The LMV422 dual rail-to-rail output amplifier offers a power

select pin (PS) that allows the user to select one of two

power modes depending on the level of performance de-

sired. This is ideal for AC coupled circuits where the circuit

needs to be kept active to maintain a quiescent charge on

the coupling capacitors with minimum power consumption.

For portable applications, the LMV422 operates in low power

mode consuming only 2 µA of supply current per channel at

a bandwidth of 27 kHz. This allows the user to reduce the

power consumption of an amplifier while maintaining an

active circuit. For additional bandwidth and output current

drive the amplifier can be switched to full power mode with 8

MHz bandwidth while consuming only 400 µA per channel.

The LMV422 features a rail-to-rail output voltage swing in

addition to an input common mode range that includes

ground. The LMV422 is designed for closed loop gains of

plus two (or minus one) or greater. The LMV422 is offered in

10-Pin MSOP miniature package to ease the adoption in

applications where board area is at a premium.

Features

n

Supply voltage

2.7V to 5.5V

n

Supply current per channel

— Low power mode

2 µA

— Full power mode

400 µA

n

Input common mode voltage range

−0.3V to 3.8V

n

CMRR

85 dB

n

Output voltage swing

Rail-to-Rail

n

Input offset voltage

1 mV

n

Bandwidth

— Low power mode

27 kHz

— Full power mode

8 MHz

n

Stable for A

V

≥ +2 or A

V

≤ −1

Applications

n

AC coupled circuits

n

Portable instrumentation

n

Smoke detectors

Typical Application

20109835

AC Coupled Application

February 2005

© 2005 National Semiconductor Corporation

DS201098

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