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ADS127L21: 24Bit ADC without digital Filter

Bernd Hafen1
Prodigy 80 points
Part Number: ADS127L21
Other Parts Discussed in Thread: ADS1271, ADS8900B

Tool/software:

Hi,

for a new project we need a 24Bit ADC without internal digital Filter (or bypass option)
currently we use ADS127L21, but as we understand the digital filter is not possible to bypass

>= 20Bit (mainly 24Bit)

>= serial protocol

<= 5,5V Supply

<= 8 LSB (INL)

preffered SAR

SMD, << 30mm²

  • +1
    TI__Mastermind 40870 points

    Hello Bernd,

    You are correct, the ADS127L21 does not support filter bypass.  The ADS1271 does offer a modulator output option, but you will still need to implement a digital filter in your host processor or FPGA.

    Based on your above requirements, I recommend the ADS8900B.

    20b SAR, 1MSPS

    Serial SPI interface

    5.5V supply

    1LSB INL typical, 2.1LSB INL max from 0C to 60C, 3.9LSB INL max -40C to 125C

    4mm x 4mm (16mm^2) VQFN SMT package

    Regards,
    Keith Nicholas
    Precision ADC Applications