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ADS58B18: How to calculate the output?

Yuxi Liu(Tony)
Expert 4420 points

Part Number: ADS58B18

Hi TIer

We use ADS58B18

What is the formula for calculating the output?

when we set the gain = 3.5dB. input is AC signal which Vpp = 350mV.

So the digital output is  = 352mv * 1.5（3.5db）/1V *2048.

Is this right?

Thank you

Tony Liu

  • 0
    TI__Guru* 83035 points

    Hi Tony,

    The output is always 11-bit. The maximum code is 0 to 2^11-1 digit in offset binary format

    The full-scale is 1.5Vpp for the maximum code of 2^11-1

    If there is a gain of 3.5dB, then the full-scale input is 1.5Vpp/(10^(-3.5/20)) =1.0025Vpp