N_Cook wrote:
Would you adam and eve it? I seem to have made a peak limited (grey?) white
noise generator.
I wanted to see if the DAC was still working as there is 5V on the supply
and the datasheet recommends 3.6V and absolute maximum of 4.6V. I cut
data-in line, pin 4, of AK4352VT, from the main Boss chip and connected ,
via 1K, to pin 9 , data out, of the ADC AV5353VT.
Maximum allowed on the ADC is 6V supply and of course absolutely no
technical data of any sort on the www for the DD6 so anything I can
establish is new territory.

Feeding sine in, the ADC o/p datastream varies on frequency. No data into
the DAC then nothing out. Connect datastream and there is 2V peak limited
white noise on the analogue output. Varying sine input or even disconnecting
makes no observable difference to the noise output. Scope shows no obvious
periodicity 100Hz to 100KHz, and sounds like white noise. Other select lines
are still connected but what , in principal, is occuring ? Presumably the
DAC is still working, both channel o/ps have this "white" noise.

Sounds like something's wrong on the input side of the ADC. Have you
tried using a scope to follow a signal from the input socket to the ADC?

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