1s/div

0.1 V/div

m

INA128-HT, INA129-HT

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SBOS501F – JANUARY 2010 – REVISED FEBRUARY 2015

8.4 Device Functional Modes

8.4.1 Noise Performance

The INA128-HT and INA129-HT provide very low noise in most applications. Low-frequency noise is

approximately 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 19. 0.1-Hz to 10-Hz Input-Referred Voltage Noise

8.4.2 Input Common-Mode Range

The linear input voltage ranges of the input circuitry of the INA128-HT and INA129-HT are 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 6 and Figure 7).

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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