ADAU 1701 external ADC with TDM
Hello,
i my new project i want to use an external ADC to use some more audiostreams and also to control some aux adc functions.
Because i need most of the gpio pins i want to use an 8-channnel time devision multiplex stream.
Which IC could be suitable for my project? Is there an IC from analog devices (or another brand) that works almost plug&play with few extrnal components and the correct settings in sigma studio? Of course i could find some ADC with 8-channel input but most of them doesn't support an 8-channel TDM stream.
Is there maybe a reference project with a schematic and the matching sigma studio settings?
I don't need the ADC to be something special (low noise, SNR), 16 bit would be enough.
Best regards,
Jonas
Audio Signal Processors
sigma studio
analog to digital converters
external adc
SigmaDSP Audio Processors
external adc with the adau1701
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Hi Jonas,
I would recommend that you use two ADAU1978s to accomplish your goal. Each has 4 ADCs, and can be configured to share a single TDM8 line. Since this is a fairly unique use case, I do not have a reference project available, however I am happy to answer any further questions about this arrangement!
Regards,
Tyler
Hello Jonas,
You could also use two ADAU1372 codecs and daisy chain the four ADCs into one TDM8 stream. It also has a clocking advantage because it has ASRCs on the serial port outputs so you can clock it from the DSP using only BCLK and LRCLK. The codec can be running on its own crystal or you could feed it MCLK if you like.
Dave T
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