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Problems in getting output of ADS7824

Vishal Mehta
Intellectual 315 points
Other Parts Discussed in Thread: ADS7824

Hello,

 I am currently working on ADS7824 and i have made the circuit according to the data sheet. I am getting the output but am unable to check whether the output is write or not.. i am using internal reference voltage of 2.5V ,-5V to 5V as input and currently am using one channel only. The output would be in the form of binary twos complement as per the data sheet. Can anyone shed some light on how to check whether the output is right or not??? i am calculating the binary num from twos complement but it seems to be not matching with theoretical output  .

  • 0
    TI__Guru**** 178641 points

    Hi Vishal,

    The input range of the ADS7824 is +/-10V, so you are only using half the dynamic range of the part.  If you start by shorting your input, you should see 0x000 as the output code.  This might toggle a couple bits, so you could see 0xFFF or 0x001.  As you increase the input voltage to +5V, you should approach code 0x1FF.  As you go to -5V, you should approach code 0x400.  Offset and gain may shift these values a little as well.