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ADS5474 output number format

Ro Rus
Prodigy 140 points

Other Parts Discussed in Thread: ADS5474

Hello!

The ADS5474 provides 14 bit number, im looking at its datasheet, but i did not see where it talks about the number format? i.e. what kind of number is it?

Is it supposed to be just 2^14, which means maximum possible number is decimal 16384?

  • 0
    TI__Mastermind 29220 points

    Hi,

    The format is offset binary ( says so on page 1 at the top of the page under FEATURES and on page 27 in the description of the digital output) 

    So the output codes will be between 0 which is the minimum code to 16383 which is the maximum code, if you are considering the 14 bits in decimal representation.

    Since the full scale input voltage is 2.2V peak to peak differential, that means that when the input voltage is -1.1V across the differential inputs then the output code wil be 00 0000 0000 0000.  And when the input voltage is +1.1V across the differential inputs then the output code will be 11 1111 1111 1111.  When the differential input voltage is exactly 0V such as when the inputs are shorted or both floating to the common mode voltage then the output code will be toggling between 01 1111 1111 1111 and 10 0000 0000 0000.

    Regards,

    Richard P.

  • 0 in reply to Richard Prentice
    Prodigy 140 points

    great. thank you.