INA129P datasheet(12/29 Pages) TI1

12 / 29 page

1s/div

0.1 V/div

INA128, INA129

SBOS051C – OCTOBER 1995 – REVISED OCTOBER 2015

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Device Functional Modes (continued)

≥ 100

Figure 23. 0.1-Hz to 10-Hz Input-Referred Voltage Noise

7.4.2 Input Common-Mode Range

The linear input voltage range of the input circuitry of the INA12x is from approximately 1.4 V below the positive

supply voltage to 1.7 V above the negative supply. As a differential input voltage causes the output voltage

increase, however, the linear input range is limited by the output voltage swing of amplifiers A1 and A2. Thus the

linear common-mode input range is related to the output voltage of the complete amplifier. This behavior also

depends on supply voltage (see performance curve Figure 6).

Input-overload can produce an output voltage that appears normal. For example, if an input overload condition

drives both input amplifiers to their positive output swing limit, the difference voltage measured by the output

amplifier will be near zero. The output of A3 will be near 0 V even though both inputs are overloaded.

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