INA3221: Frequency response of the sigma delta ADC.

Stephen Felix

Part Number: INA3221

Is the frequency response given on p7 (Fig1 section 7.6) of the datasheet due to the digital filtering of the 500kHz sigma-delta modulator output ?

Does this response vary with the 'ADC conversion time' setting ?

If so, then which 'ADC conversion time' corresponds to Fig 1 and what are the responses for other ADC conversion time settings ?

over 6 years ago

0 Guang Zhou over 6 years ago

TI__Mastermind 34960 points

Hi Stephen,

I think Fig 1 corresponds to the default ADC conversion setting highlighted below:

The overall frequency response shape should remain similar to that of a sinc filter, with the notches being different at different conversion time( or data rates ).

Regards, Guang

0 Guang Zhou over 6 years ago in reply to Guang Zhou

TI__Mastermind 34960 points

Hi Stephen,

Please let us know if you have further questions on this topic; otherwise please click “this resolved my issue” button. And thank you in advance for your feedback.

Regards, Guang

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INA3221: Frequency response of the sigma delta ADC.