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Old 5th August 2012, 05:54 PM   #1
3nity is offline 3nity  Austria
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Join Date: Apr 2009
Default CS8406 problem

Hi folks!

I've built a stereo ADC card using the ES9102C in master mode, and the CS8406 as a slave and in hardware mode. I2S format.
Schematic attached.

I'm using a Scientific conversion SC-937 as aes-ebu transformer,
recording through an old Fostex D-5 DAT machine.

Two strange thing happens:
1)
the d-5 doesn't lock to 44.1kHz, but says 48kHz, while ADC and CS8406 are actually working at 44.1.
I checked the I2S wires from the ES to the CS and the clocks are correct.
Still D-5 meter says 48, not 44.
I can hear the sound from the DAT when in pause mode, but when I record, nothing is left on the tape.
Switching ADC to 48kHz operation, everything works just fine.
Pin settings are the same, only the clocks change, I cannot understand.

2) :
On the ES9102 datasheet, the max analog input for full scale is stated as 2.2Vpp differential (0dBu, or 0.78Vrms).
If I input a sine wave, and measure exactly 0dBu on the ES inputs,
the DAT never goes beyond -6dBFS, same thing if I increase the sine amplitude, it sticks at -6 as if there was a sort of limiter.

The default value in the volume control register is 0xffffff, did not write in it, so I was expecting to get a full scale reading.

Any thoughts?

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Old 8th January 2013, 06:40 AM   #2
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Join Date: Nov 2006
Location: Adelaide, South Australia
Blog Entries: 19
Hi,
Old thread, but it kind of looks like your DAC is looking for Left justified data rather than I2S. This right shift of the audio data between Left Justified and I2S of one bit is exactly 6dB...
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