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ADUC845 Data Conversion

Question asked by avraka on Sep 18, 2017
Latest reply on Sep 19, 2017 by Aj.Hernandez

Dear ADIer

Please help me to understand how to calculate the ADC code.


  1. I wonder about the meaning of output code. Code 000 ... 000, code 100 ... 000, code 111.111 in the Data Output Coding Session of ADUC845 Datasheet page 36
  2. I can calculate Code = (2.56V x 1 x 2^16) / (1.024 x 2.56Vref) = 64000(H) = 0110 0100 0000 0000 0000. Is it correct?
  3. I am wondering about the meaning of input voltage like zero differential, midscale and full scale. What is the reference for this definition in sight of input allowable voltage range
  4. With respect to GAIN, it is 1 at 2.56V range, and it is composed of 20mv units. Should the measured value be larger if Gain is large? If you look at the sample range, it looks like it's shrinking.

  5. On the same page, I want to know about the purpose and IEXC1 / 2.

  6. Could you explain the Sinc Filter 69 = decimal in figure 18,