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ADS1282-HT: Bit Order

Jay Prizant
Prodigy 40 points
Part Number: ADS1282-HT

Figure 54 shows the data bytes come out msbyte first, but it doesn’t explicitly show bit order within each byte.

  • 0
    TI__Mastermind 44610 points

    Hi ,

    Welcome to the TI E2E Forums!

    The ADS1282-HT outputs the most significant bit first (in each byte).

    If you are using the FIR filter, then the first bit you clock out will be the sign-bit. Each consecutive data bit that you clock out from there will carry a smaller weight, until you clock out the LSB (second to last bit) and then a redundant sign bit (last bit).

    Please note that when using the FIR filter, the 31-bit data is LEFT-aligned in the 32-bit word and the last bit will be a redundant sign bit.
    However, if you only use the SINC filter (i.e. FILTR[1:0] = 01b), then the 31-bit data will be RIGHT-aligned in the 32-bit word and there won't be a redundant sign-bit.

    Best regards,
    Chris