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ADS1271: Can the ads1271 be used for a 6.5 multimeter?

zac zhang
Prodigy 95 points
Part Number: ADS1271
Other Parts Discussed in Thread: ADS127L21, PGA855

Tool/software:

Can the ads1271 be used for a 6.5 multimeter? If the accuracy can be achieved?

  • 0
    TI__Mastermind 46470 points

    Hello Zac,

    The ADS1271 can be used for many different applications, but the internal digital filter is not ideal for a DMM and would likely require additional digital filtering.  The ADS1271 is TI's first generation wide bandwidth delta-sigma ADC.  We recently released a third generation version of this device, the ADS127L21.

    The ADS127L21 has many internal digital filter options that make it ideal for DMM applications.  Some of the key specifications of this part:

    AC accuracy with dc precision:
    – Dynamic range (60SPS): 136.9dB (typical)
    – THD: –125dB (typical)
    – INL: 0.4ppm of FS (typical)
    – Offset drift: 50nV/°C (typical)
    – Gain drift: 0.5ppm/°C (typical)
    – Supports 3.3V only operation
    Power-scalable speed ranges:
    – Max speed: 512kSPS, 33mW (typical)
    – High speed: 400kSPS, 26mW (typical)
    – Mid speed: 200kSPS, 14mW (typical)
    – Low speed: 50kSPS, 4.3mW (typical)

    There is also a nice application note that shows performance with one of TI's latest PGA amplifiers, PGA855, extending the input range to +/-12V.
    https://www.ti.com/lit/an/sboa585/sboa585.pdf

    Regards,
    Keith Nicholas
    Precision ADC Applications