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ADS1231: single power supply possible?

Jean-Pierre Martinez
Prodigy 10 points
Part Number: ADS1231
Other Parts Discussed in Thread: ADS1100,

Hello,

I have an application where I was using an ADS1100 to interface a microcontroller to a full bridge. It is simple and worked great but two main things made me look for a change : 

  • 8x gain is not enough
  • No powerdown modes - my application is battery powered and every mA counts

So I looked a bit and found what seems to be the best candidate : The ADS1231. Unfortunately, I only have 3.3V on board and no real Knowledge on how to do digital and analog power supplies. I did not find much information about the ADS1231 using only one power supply.

Can somebody please tell me if it possible to use it with only one power supply ? If so, what do I need to take care of. Or maybe guide me to another product. 

Thanks in advance.

JP

  • +1
    TI__Guru 51916 points

    Hi Jean-Pierre Martinez,

    As you can see from the ADS1231 datasheet, both supplies can be tied any voltage between 3V and 5.3V. So you can connect your MCU 3.3V to both supplies

    And, as noted, the ADS1231 has a PWDN pin to be able to conserve power when not in use

    The ADS1231 has a bridge powerdown switch (see pin "SW") that can be used to disconnect power from the resistive bridge and powerdown this component as well

    This ADC should work well for your application

    -Bryan

  • 0 in reply to Bryan Lizon86
    Prodigy 10 points

    Thanks for the answer. I should have seen that. BR