LPV531

Programmable Micropower CMOS Input, Rail-to-Rail

Output Operational Amplifier

General Description

The LPV531 is an extremely versatile operational amplifier.

A single external resistor gives the system designer the

ability to define the quiescent current, gain bandwidth prod-

uct and output short circuit current. This innovative feature

gives the system designer a method to dynamically switch

the power level to optimize the performance of the op amp

and meet the system design requirements.

The LPV531 can be tailored to a wide variety of applications.

It offers the system designer the ability to dynamically trade

off supply current for bandwidth by adjusting the current

drawn from the I

value resistors in series with the I

capable of operating from 73 kHz, consuming only 5 µA, to

as fast as 4.6 MHz, consuming only 425 µA. The input offset

voltage is relatively independent and therefore is not signifi-

cantly affected by the chosen power level.

Utilizing a CMOS input stage, the LPV531 achieves an input

bias current of 50 fA and a common mode input voltage

which extends from the negative rail to within 1.2V of the

positive supply. The LPV531’s rail-to-rail class AB output

stage enables this op amp to offer maximum dynamic range

at low supply voltage.

Offered in the space saving 6-pin TSOT23 package, the

LPV531 is ideal for use in handheld electronics and portable

applications. The LPV531 is manufactured using National’s

advanced VIP50 process.

A fixed supply current/gain bandwidth is available upon re-

quest.

Features

(Typical 5V supply, unless otherwise noted.)

n

Supply voltage

2.7V to 5.5V

n

Dynamic power mode setting

n

Continuously programmable supply current

— Range

5 µA to 425 µA

n

Continuously programmable bandwidth

— Range

73 kHz to 4.6 MHz

n

Input common mode voltage range

−0.3V to 3.8V

n

CMRR

95 dB

n

Rail-to-rail output voltage swing

n

Input offset voltage

1 mV

Applications

n

AC coupled circuits

n

Portable instrumentation

n

Active filters

Typical Application

20132335

AC Coupled Application

May 2006

© 2006 National Semiconductor Corporation

DS201323

www.national.com