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sigma-delta demodulator

Vincenzo Pizzolante
Mastermind 25426 points

hi,

is correct to use a LPF to extract analog data from the output digital stream of a sigma-delta ADC?

if yes, any guideline on how to implement it is more than welcome

thanks a lot in advance

KR

Vincenzo

  • 0
    TI__Guru**** 180961 points

    Hi Vincenzo,

    You could put together a LPF to filter the bitstream, but its more common to keep the results in the digital domain by using a digital filter.  We have 'SDFM' (Sigma Delta Filter Module) peripherals on some of the MSP43x and C2000 series processors that do the legwork for you.  You can also develop a digital filter using about 3000 gates in an FPGA.  Digital filters have the flexibility of being able to change filter order and over sampling rates.  Using an analog filter often means using a secondary digitizer (an ADC in your micro for example), which ultimately reduces the accuracy that you can achieve.