INA190 datasheet(22/48 Pages) TI2

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Temperature (qC)

-50

-25

100

125

150

D115

A2, A3, A4, A5

VOUT

1.7 V to 5.5 V

IN±

IN+

OUT

Bus Voltage

up to 40 V

RSENSE

Load

Capacitively Coupled

Amplifier

ENABLE

3dB

F F

4 R C

RDIFF

INA190

REF

GND

CBYPASS

0.1 µF

INA190

SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019

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Application Information (continued)

8.1.3 Signal Conditioning

When performing accurate current measurements in noisy environments, the current-sensing signal is often

filtered. The INA190 features low input bias currents. Therefore, adding a differential mode filter to the input

without sacrificing the current-sense accuracy is possible. Filtering at the input is advantageous because this

action attenuates differential noise before the signal is amplified. Figure 40 provides an example of how to use a

filter on the input pins of the device.

Figure 40. Filter at the Input Pins

The differential input impedance (RDIFF) shown in Figure 40 limits the maximum value for RF. The value of RDIFF

is a function of the device temperature, as shown in Figure 41.

Figure 41. Differential Input Impedance vs Temperature

INA190 Datasheet(PDF) 22 Page - Texas Instruments

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