Temperature (qC)

-50

-25

0

25

50

75

100

125

150

0.5

1

1.5

2

2.5

D046

A1

A2, A3, A4, A5

1.7 V to 5.5 V

IN±

IN+

VS

OUT

+

±

Bus Voltage

up to 40 V

Load

Capacitively Coupled

Amplifier

ENABLE

3dB

F F

1

f

4 R C

S

TI-Device

TM

12

INA191

SLYS020 – FEBRUARY 2019

www.ti.com

Product Folder Links: INA191

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Copyright © 2019, Texas Instruments Incorporated

Application Information (continued)

8.1.3 Output Signal Conditioning

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

filtered. The INA191 features low input bias currents. Therefore, it is possible to add a differential mode filter to

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

action attenuates differential noise before the signal is amplified. Figure 4 provides an example of how to use a

filter on the input pins of the device.

Figure 4. Filter at the Input Pins

a function of the device temperature and gain option, as shown in Figure 5.

Figure 5. Differential Input Impedance vs Temperature