LMC6484AIMSLASHNOPB datasheet(21/50 Pages) TI2

21 / 50 page

A two op amp instrumentation amplifier designed for a gain of 100V/V is shown in Figure 7-4. Low sensitivity

trimming is made for offset voltage, CMRR, and gain. Low cost and low power consumption are the main

advantages of this two op amp circuit. An alternative circuit with a gain of 10V/V with the RES11A is also

provided for this circuit in Figure 7-5.

Higher frequency and larger common-mode range applications are best facilitated by a three op amp

instrumentation amplifier.

VOUT

–

LMC648x

VIN

10k

–

LMC648x

10k

0.1%

9.95k

CMRR

Trim

10k ,

0.1%

Gain

Trim

191

VIN+

0.1%

Figure 7-4. Low Power, Two Op Amp Instrumentation Amplifier

RES11A90-Q1

REF

–

IN+

OUT

LMC648x

Figure 7-5. Low Power, Two Op Amp Instrumentation Amplifier with RES11A

7.2 Typical Applications

7.2.1 3V Single-Supply Buffer Circuit

–

LMC648x

OUT

0.1μF

Figure 7-6. 3V Single-Supply Buffer Circuit

7.2.1.1 Design Requirements

For best performance, ensure that the input voltage swing is between V+ and V–.

Also, ensure that the input does not exceed the common-mode input voltage range.

To reduce the risk of destabilizing the output, use resistive isolation on the output when driving capacitive loads

(see Section 7.2.1.2).

When large feedback resistors are used, compensate for parasitic capacitance on the input, if necessary. See

Section 7.2.1.2.

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LMC6482

LMC6484

SNOS674J – OCTOBER 1997 – REVISED SEPTEMBER 2024

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