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ADAU 1442: Problems to set FS 96/192kHz

Question asked by MarcE on Nov 5, 2014
Latest reply on Nov 6, 2014 by MarcE

Hello

 

it seems that SigmaDSP doesn't set the ADAU 1442 to the desired 96 or 192 kHz.

If anything is set to 96 kHz, the 1442 outputs send every 24-Bit Data twice, so the real resolution stays at 48kHz.

With 192kHz every Data is send four times.

It doesn't matter wether i use the ADCs or do program the ADAUs signa lgenerator, the problem stays the same.

With 48kHz erverything is fine.

 

The 1442 is programmed with a MCU via exporting the SigmaDSP header files. The MCU programms the 1442 using I2C.

That does work.

ADC/DAC are connected via standard I2S, Clocks are

System :  24MHz (ADAU Clock Out)

Bitrate:     12Mhz

Frame:     96 kHz/192kHz

ADAU clock is Master both for ADCs and DACs

Jumper for PLL0 is fitted (PLL0 = low)

PLL2: doesn't matter wether Level is High or Low

PLL1: can't be low, DSP crashes if Level is set to low

quartz crystal: 12 MHZ

I tried to fix that Problem for two days but had no success.

 

with regards

 

Marc E

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