Problem ADAU1446 Level-Detector Algorithm

Maurizio,

Can you please provide more detail about what's not working for you? What difference are you seeing in the level detectors between the ADAU1701 ad ADAU1446? The function of this block in SigmaStudio has remained the same between these two processors.

In DSP ADAU1701 write register address of DATACAPTURE0 LEVEL DETECTOR then read the parameter.
In ADAU1446 how I understand it, you need to read directly from the register of the control.
Applying the same algorithm:

dB_value = 96.32959861 * (readback_value / 2exp19 - 1)

I get the wrong values.
Something wrong?

Maurizio

Here's an explanation on how to read back instantaneous and average Linear signal levels from SigmaDSP:

https://ez.analog.com/message/7669#7669

The format of the readback signal is basically a fraction of full scale. So, if I read back 0.5, then it means my signal level is half of full-scale, or -6 dB.

You'll have to do the dB conversion in an external processor/microcontroller.

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