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Old 19th December 2014, 09:37 AM   #1
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Default WM8804, no DOUT

Guys

Last few weeks I have tried to design a SPDIF receiver with DAC. Yesterday I have build it finally. Sadly it don't work. The power supply is OK and the signals at the pin "BCLK, LRCLK and MCLK" seems to be there. But there's nothing coming out the DOUT line.

I use the chip in hardware mode. I have used a digital output of a old CD player to test it.

Is there someone who can check my schematic if there is an configuration error?

Many thanks!
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Old 21st December 2014, 11:36 AM   #2
fotios is offline fotios  Greece
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In hardware mode, you must use a XTAL of 12MHz.
The CSB/GPO1 pin must be tied to Vdd through 10K resistor. Then you could connect a LED at this pin that will indicate the UNLOCK condition.
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Old 22nd December 2014, 08:51 PM   #3
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Thank you for the tip!

I have tied the CSB pin to the supply with a 10K resistor. Sadly my scope is broken so I only can listen. It now seems to do something. It's humming at the output . . .
A led does not blink when connected to the pin. A 12mHz crystal is connected.

Last edited by bertheeren; 22nd December 2014 at 09:11 PM.
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Old 15th January 2015, 10:51 PM   #4
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Hmm

I know get signal out of the WM8804, but not sound out the DAC at both channels.
I use I2s 16bit out of the WM8804. Clock signals seems OK.

Is it correct that you measure a square wave between pin number 2 and 4 of the PCM5102 ?
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