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ADS8344 not reaching Reference at input -> loosing bits?

schaefer1
Prodigy 180 points
Other Parts Discussed in Thread: ADS8344

Hello everyone,

I have one problem which is inconceivable to me. I have read very much documents about ADC's before i make a final design for my board. There wasn't any description about that one problem. So here are the questions:

1. How can i divide an input voltage (e.g. with reference 2.5V on ADS8344) to reach exactly the rails of the reference voltage? I mean i will loosing some read-bits because it is not possible to reach the reference input exactly (e.g. i will reach only 2.48V). So there aren't really =16bits available.

2. Is a simple voltage divider at the input conceivable (with ADS8344)?

Best Regards,
Sebastian

  • 0
    TI__Genius 9165 points
    Hello Sebastian,

    Please let us know your input voltage range & we can check how the resistance divider can be configured.

    It is not recommended to connect resistance divided signal directly to the ADC. You will need an operational amplifier to drive the ADC inputs.

    If its okay, please share your ADC/application requirements in detail.

    Thanks & Regards,
    Shridhar.
  • 0 in reply to Shridhar%20More
    Prodigy 180 points
    Hello,

    Okay that was my opinion too, that it is not recommendend to connect a voltage divider at the input. Thanks for the answer.
    It will be simple voltage measurement (DC-signal) with 8 used inputs. We will use DAC8688 now which has much more possibilities for us.

    Best Regards,
    Sebastian