INA190 datasheet(12/20 Pages) TI1

12 / 20 page

VREF

VOUT

VVS

1.7 V to 5.5 V

IN±

IN+

REF

OUT

RF < 100

RINT

RF < 100

RINT

Bus Voltage

±0.1 V to +40 V

RSENSE

Load

Capacitively

Coupled

Amplifier

ENABLE

3dB

4 R C

INA190

SBOS863 – MARCH 2018

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Product Folder Links: INA190

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Application Information (continued)

8.1.3 Output Signal Conditioning

When performing accurate current measurements in noisy environments, it is common to filter the current-

sensing signal. The INA190 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 a filter

can be used on the input pins of the device.

Figure 4. Filter at Input Pins

When using the INA190 in applications where there are periodic high-frequency currents that are above the

bandwidth of the device (for example, sensing the input current of a dc-dc convertor), it is highly recommended

to apply an input filter to attenuate differential current noise. Using a 100-Ω resistor for RF and a 22-nF capacitor

for CF results in a low-pass filter corner frequency of 36.2 kHz, which does not severely impact the current-

sensing bandwidth, but does filter out most high-frequency signals. If a lower corner frequency is desired,

increase the value of CF.

If high-frequency, common-mode noise is a concern, add an RC filter from the OUT pin to ground. The value for

the resistance of the RC filter is limited by the impedance of the load. Any current drawn by the load manifests as

an external voltage drop from the INA190 OUT pin to the load input.

INA190 Datasheet(PDF) 12 Page - Texas Instruments

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