INA190 datasheet(17/48 Pages) TI2

Part #	INA190

Description	INA190 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Precision Current-Sense Amplifier With Enable

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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17 / 48 page

+ 1.8 V

IN-

IN+

OUT

-3.3 V

RSENS E

Capacitive ly

Couple d

Amplifier

ENABL E

INA190

REF

GND

- 3.3 V

ADC

CBYPASS

0.1 µF

Loa d

INA190

www.ti.com

SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019

Product Folder Links: INA190

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Device Functional Modes (continued)

Another use for the REF pin in unidirectional operation is to level shift the output voltage. Figure 36 shows an

application where the device ground is set to a negative voltage so currents biased to negative supplies, as seen

in optical networking cards, can be measured. The GND of the INA190 can be set to negative voltages, as long

as the inputs do not violate the common-mode range specification and the voltage difference between VS and

GND does not exceed 5.5 V. In this example, the output of the INA190 is fed into a positive-biased ADC. By

grounding the REF pin, the voltages at the output will be positive and not damage the ADC. To make sure the

output voltage never goes negative, the supply sequencing must be the positive supply first, followed by the

negative supply.

Figure 36. Using the REF Pin to Level-Shift Output Voltage

INA190 Datasheet(PDF) 17 Page - Texas Instruments