INA186A1IDDFT datasheet(15/46 Pages) TI

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the negative differential input signal increases, the output voltage moves downward from the saturated supply

voltage. The voltage applied to the REF pin must not exceed VS.

Another use for the REF pin in unidirectional operation is to level shift the output voltage. Figure 7-3 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 INA186 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 INA186 is fed into a positive-biased

analog-to-digital converter (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.

+ 1.8 V

IN-

IN+

OUT

-3.3 V

RSENSE

Capacitively

Coupled

Amplifier

INA186

REF

GND

- 3.3 V

ADC

CBYPASS

0.1 µF

Load

Figure 7-3. Using the REF Pin to Level-Shift Output Voltage

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INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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INA186A1IDDFT Datasheet(PDF) 15 Page - Texas Instruments