INA821 datasheet(23/51 Pages) TI2

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8.3.4 Input Protection

The inputs of the INA819 device are individually protected for voltages up to ±60 V. For example, a condition

of –60 V on one input and +60 V on the other input does not cause damage. Internal circuitry on each input

provides low series impedance under normal signal conditions. If the input is overloaded, the protection circuitry

limits the input current to a value of approximately 8 mA.

+VS

-VS

Overvoltage

Protection

Input Transistor

-V

Input Voltage

Source

ZD1

ZD2

Figure 8-8. Input Current Path During an Overvoltage Condition

During an input overvoltage condition, current flows through the input protection diodes into the power supplies;

see Figure 8-8. If the power supplies are unable to sink current, then Zener diode clamps (ZD1 and ZD2 in

Figure 8-8) must be placed on the power supplies to provide a current pathway to ground. Figure 8-9 shows the

input current for input voltages from –50 V to 50 V when the INA819 is powered by ±15-V supplies.

Input Voltage (V)

-50

-40

-30

-20

-10

-20

-8

-16

-6

-12

-4

-8

-2

-4

D015

Input Current

Output Voltage

Figure 8-9. Input Current vs Input Overvoltage

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INA819

SBOS959D – DECEMBER 2018 – REVISED APRIL 2022

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