Single/Dual/Triple/Quad

Operational Amplifiers

22

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Single-Supply Operation

The ICL7611 family will operate from a single 2V to 16V

power supply. The common-mode voltage range of the

standard amplifier types when operated from a single

CMVR is 1.3V to (V+ - 1.3V). If this CMVR range is

insufficient, use the ICL7612, whose CMVR includes

both ground and V+, or the ICL7616, whose CMVR

includes ground.

A convenient way to generate a psuedo-ground at V+/2

is to use one op amp of a quad to buffer a V+/2 voltage

from a high-impedance resistive divider.

Low-Voltage Operation

10µA. Output swings to within a few millivolts of the

Guaranteed input CMVR is ±0.6V minimum and typical-

where greater common-mode range is desirable, see

the description of ICL7612 and ICL7616 above.

Applications Information

Note that in no case is IQ shown. The value of IQ must

be chosen by the designer with regard to frequency

response and power dissipation.

Figure 1. Instrumentation Amplifier—Adjust R3 to improve

CMRR. The offset of all three amplifiers is nulled by the offset

adjustment of A2.

Figure 2. Simple Follower—By using the ICL7612 in these

applications, the circuits will follow rail-to-rail inputs

-

-

+

+

A1

+

-

A2

R

R

R3

R2

R2

25k

Ω

R3

R1

+18V

+

-

A3

GAIN =

R3

R

2R2

R1

ICL7612

+

-

≥ 10kΩ