1s/div

0.1 V/div

m

INA129-EP

SBOS508A – DECEMBER 2009 – REVISED DECEMBER 2015

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7.4 Device Functional Modes

A single external resistor sets the any gain from 1 to 10000. TI INA129-EP provides an industry standard gain

equation, as highlighted in Figure 16.

7.4.1 Noise Performance

The INA129-EP provides very low noise in most applications. Low frequency noise is approximately 0.2

μVPP

measured from 0.1 Hz to 10 Hz (G

≥ 100). This provides dramatically improved noise when compared to state-

of-the-art chopper-stabilized amplifiers.

G

≥ 100

Figure 15. 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 INA129-EP 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 will be limited by the output voltage swing of amplifiers A1 and

A2. So the linear common-mode input range is related to the output voltage of the complete amplifier. This

behavior also depends on supply voltage (see Figure 5 and 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.

12

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