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ADS1018

Bill Keith
Intellectual 300 points
Other Parts Discussed in Thread: ADS1018, ADS1118

I plan to use your ADS1018, I want to operate it down to about 2.1V, using it in single ended mode. But I want to get the full 12 bit range of 0-4095 so what would the PGA need to be set to? I can use an input range of 0-1.024 or 0-2.048. If I can't get the full range with this part can you recommend a different part.  I need a 4 channel single ended device, 0-70V, operate down to ~2.1V, SPI interface, 12 bit.  Thanks

  • 0
    TI__Guru* 97585 points
    Bill,


    The ADS1018 reports data with a differential input in a twos complement notation. In the case of operating it down to 2.1V, you could set the range to +/-2.048V for the full scale, but the positive full scale range would only be 2047 codes.

    If you need more resolution, I would use the ADS1118. It has 16 bit resolution. Even if you set it to the +/-4.096V range, you would still get more resolution than with the ADS1018.


    Joseph Wu