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some misunderstanding of the Vref values for the ADAU1979

Question asked by macci77 on Jan 8, 2017
Latest reply on Jun 23, 2017 by Rajeev

To see the dynamic range in the adau1979 A2D i print out the values of the data grater than 0.9999 and smaller than -0.9999.

For close to 1.0 the values that represent it are 0x7FFFFF and down, and I start getting it when the Vpp in the signal generator is 1050 Vpp.

For the opposite, to get the value smaller than -0.9999 , i see a value of 1700 Vpp in the signal generator.

1 - why is this like this? not symmetric.

2 - The Vrms in the sheet is 4.5. That means i would have expected the maximum values arround 6.12 Volts.

    Why is this like this?

 

MAccabi

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