Hello,
I am using an AKM AK5538 ADC in TDM512 mode (schematic attached). The DSP settings for Serial In 0 are also attached.
BCLKO0, LRCLK0 are outputs into the ADCs BCLK and LRCLK. MCLKO goes to ADC MCLK.
SDTO goes to SDATAIN0.
Unfortunately when attaching 8 level meters to the 8 inputs, I only see activity on channel 1 and 2.
Hello Sylwester,
I have a couple of questions, before that could you please help me with attaching your project?
I believe your sample rate is 48KHz. Note that you can't do TDM16 if the sample rate is above 48kHz.
Are you trying to input TDM16 to the DSP? I have to confirm once again since you set the serial input to be 16 channels and you mentioned TDM512 mode, below is what I found in the ADC datasheet regarding TDM512 mode.
Are you trying to do something like this above picture, having two 8 channel ADCs and cascading it to give a 16 channel ADC out to the DSP input?
Can you probe the ADC's SDT0 pin and verify it's outputting 16 channels? If possible, please attach a scope shot of serial clocks and data.
I see your word length is set as Flexible TDM (FTDM), I hope it's mistakenly set.
when attaching 8 level meters to the 8 inputs, I only see activity on channel 1 and 2.
This channel 1 and 2 receive correct and intended data from the ADC?
There are only a very few registers to put the DSP in TDM16 and it will be running without out a problem once it receives 16 channels (of course with a proper clock settings), so we have to closely look at the ADC's out.
I haven't checked the ADC's registers yet; I will do once I get a reply from you.
Regards,
Harish
Hello Sylwester,
I have a couple of questions, before that could you please help me with attaching your project?
I believe your sample rate is 48KHz. Note that you can't do TDM16 if the sample rate is above 48kHz.
Are you trying to input TDM16 to the DSP? I have to confirm once again since you set the serial input to be 16 channels and you mentioned TDM512 mode, below is what I found in the ADC datasheet regarding TDM512 mode.
Are you trying to do something like this above picture, having two 8 channel ADCs and cascading it to give a 16 channel ADC out to the DSP input?
Can you probe the ADC's SDT0 pin and verify it's outputting 16 channels? If possible, please attach a scope shot of serial clocks and data.
I see your word length is set as Flexible TDM (FTDM), I hope it's mistakenly set.
when attaching 8 level meters to the 8 inputs, I only see activity on channel 1 and 2.
This channel 1 and 2 receive correct and intended data from the ADC?
There are only a very few registers to put the DSP in TDM16 and it will be running without out a problem once it receives 16 channels (of course with a proper clock settings), so we have to closely look at the ADC's out.
I haven't checked the ADC's registers yet; I will do once I get a reply from you.
Regards,
Harish
