LMC6484AIMXSLASHNOPB.B datasheet(17/50 Pages) TI2

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6 Detailed Description

6.1 Overview

The LMC648x are CMOS operational amplifiers that supports both rail-to-rail inputs and outputs. The device

operates in both dual-supply mode and single-supply mode.

6.2 Functional Block Diagram

Rail-to-rail

common-

mode and

differential

front end

Ultra-low

Bias

Rail-to-Rail

IN+

OUT

LMC648x

6.3 Feature Description

6.3.1 Amplifier Topology

The LMC648x are true rail-to-rail input operational amplifiers with an input common-mode range that extends

300mV beyond either supply rail. When the input common-mode voltage swings to about 3V from the positive

rail, some dc specifications, namely offset voltage, can be slightly degraded. Figure 6-1 illustrates this behavior.

The LMC648x incorporate a specially designed input stage to reduce the inherent accuracy problems seen in

other rail-to-rail input amplifiers. The LMC648x input stage design is complemented by an output stage capable

of rail-to-rail output swing even when driving a large load.

Common-Mode Voltage (V)

-8 -7 -6 -5 -4 -3 -2 -1

-3000

-2500

-2000

-1500

-1000

-500

500

1000

1500

2000

2500

3000

−= −7.5V, V+ = 7.5V

Figure 6-1. Input Offset Voltage vs Common-Mode Voltage

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LMC6482

LMC6484

SNOS674J – OCTOBER 1997 – REVISED SEPTEMBER 2024

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