INA821 datasheet(26/48 Pages) TI

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9.2.1.2.3 Input Voltage Range

The INA592 is able to measure input voltages beyond the supply rails. The internal resistors divide down the

voltage before the voltage reaches the internal op amp, and provide protection to the op amp inputs. Figure 9-3

shows an example of how the voltage division works in a difference-amplifier configuration. For the INA592 to

measure correctly, the input voltages at the input nodes of the internal op amp must stay less than 0.1 V of the

positive supply rail, and can exceed the negative supply rail by 0.1 V. See Section 10 for more details.

REF

OUT

+IN

-IN

SENSE

V-

INOP

R1 R2

INOP

R1 R2

Figure 9-3. Voltage Division in the Difference Amplifier Configuration

The INA592 has integrated ESD diodes at the inputs that provide overvoltage protection. This feature simplifies

system design by eliminating the need for additional external protection circuitry, and enables a more robust

system. The voltages at any of the inputs of the devices in G = ½ configuration with ±18-V supplies can safely

range from +VS − 54 V up to −VS + 54 V. For example, on ±10-V supplies, input voltages can go as high as

±30 V.

9.2.1.2.4 Capacitive Load Drive Capability

The INA592 can drive large capacitive loads, even at low supplies. The device is stable with a 500-pF load; see

Section 7.7.

INA592

SBOS914F – OCTOBER 2018 – REVISED APRIL 2021

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INA821 Datasheet(PDF) 26 Page - Texas Instruments