• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 45 subscribers
  • Views 211 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS131M08: How to know how much harmonic supported by data convertor ADS131M08 or ADS131E08

Selec Controls1
Intellectual 280 points
Part Number: ADS131M08
Other Parts Discussed in Thread: ADS131E08

Hello,

I want to know how much harmonic supported by the data convertor IC (either ADS131E08 or ADS131M08)

I've checked datasheet, but it says

THD: –90 dB at 50 Hz and 60 Hz (in ADS131E08)

Total harmonic distortion: –100 dB (in ADS131M08)

I want up to what component the IC is able to calculate harmonics e.g. up to 63rd or 31st etc.

Thanks & Regards

  • 0
    TI__Mastermind 20805 points

    Dear Selec Controls1,

    welcome to our e2e forum and thank you for your interest in our metering ADCs.

    I assume you are talking about harmonics of 50Hz and 60Hz for analysis in some sort of power quality meter. The important point to note is that both ADCs (ADS131E08 and ADS131M08) use a digital filter with a SINC filter response. That means any signal beyond DC is being attenuated. You can find the respective digital filter frequency response plots in the datasheets. So in order to properly measure the harmonics you will have to compensate for the digital filter attenuation in the MCU connected to the ADC. A typical approach would be to implement a so-called droop compensation filter which counters the droop of the digital filter of the ADC in the frequency range of interest.

    To my knowledge customers use those ADCs to measure harmonics up to 50th or 63rd today already.

    Regards,