INA821 datasheet(25/47 Pages) TI

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9.2.1.2.3 Input Voltage Range

The INA597 measures 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 INA597 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

INOP

+IN

±IN

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

The INA597 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 parts 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, the input voltages can go as high as

±30 V.

9.2.1.2.4 Capacitive Load Drive Capability

The INA597 can drive large capacitive loads, even at low supplies. The device is stable with a 500-pF load; see

Section 7.7.

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INA597

SBOS385B – AUGUST 2019 – REVISED APRIL 2021

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INA821 Datasheet(PDF) 25 Page - Texas Instruments