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Original question:

INA 220 ADC power supply source

INA220: INA220 ADC reference

Shekhar Tilve1
Prodigy 120 points
Part Number: INA220

As mentioned earlier  query , the ADC is powered off the voltage as Vs pin. All level shifting of the shunt voltage from VCM to ground level for internal ADC is done internally. All error effects from power supply (PSRR), VCM (CMRR), and temperature are characterized and specified in the electrical specification table.

If VS is the power supply for ADC, Is there any internal reference voltage used for ADC (Since Vs may vary  ~ 3.2V to 3.5V , Does it affect the Voltage & current accuracy)

  • 0
    TI__Mastermind 27390 points

    Hi,

    You’re correct there is an internal reference used by the ADC, and yes it is a critical piece that affects the voltage and current accuracy.

    Being “internal”, its effects are accounted for by the PSRR, gain error and Vos drift specs. There is no need for us to worry about it as system level users.

    Regards, Guang