ADAU1452 Volume control via Auxiliary ADC input does not work

I want to implement a volume control in a ADAU1452-project which shall be controlled by an Auxiliary ADC input.

In combination with a SIGMA100 and SIGMA200 DSO this is very easy, as I simply have to connect the ADC input cell to the control input of a "single slew ext vol" cell.

But with the new Sigma300 this does not work. The volume control cell expects a control signal in 8.24 format but it seems that the ADC input delivers values between 0 and 1023 in 32.0 format.

Is it now necessary to convert the ADC input signal before it can be used with the volume control cell? If so,why has this be changed?



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