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INA229: INA229 Low Range vs High Range

Philip Ebbert
Prodigy 30 points
Part Number: INA229

Is there an internal amplifier to boost the input signal on the low range, or, is it merely a software setting?

The reason I ask is the high range ENOB is almost exactly 2 bits (4X) higher on all sample periods which would be consistent with just running all input signals on the high range, even low signals.

Are there any advantages to running the INA229 on the low range setting?

Thank you,

  • 0
    TI__Genius 17990 points

    Hello Philip,

    I reached out to the design team, they said that we don’t have an amplifier to boost the signal, it is a digital setting for the ADC to get a higher resolution. That’s why ENOB is lower for lower range compared to higher range if conversion time and averaging remains same. You can achieve higher ENOB by using a longer conversion time and averaging while achieving higher resolution.

  • 0 in reply to Mitch M
    Prodigy 30 points

    Thanks for the info.

    I will do some testing to see if it makes sense for us to switch to the high range during over-current conditions or just leave the part in high range all the time. Higher resolution is nice but if it comes with no greater accuracy it may not be useful to us.