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TOPIC: Please help me with my USBStreamer issue

Please help me with my USBStreamer issue 2 years 2 months ago #39167

  • Druid
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Hello everyone, i have a problem using USBStreamer
I bought 4x PCM1802 Adc for 8 input to USBStreamer, and connected them as slaves.
When using 3 Adc it's work normally and have no problem. But when i connect the 4th Adc, almost all input signal keep jumping up to peak and clipping while the input is not connected. I swapped the Adc, whichever 3 of 4 will work normally.(The external power for the Adcs is enough to drive 4 Adc. USBStreamer load the default firmware when i bought it and the i2s line is about 10cm long).
My question is : Is there any I2S split method in there? i heard that someone connect the I2s line with resistors in parallel to split it.
USBStreamer is awesome, i like it so much, if someone have any idea to solve my problem please share. Thank you

PCM1802 schema in attachments, and i already made adjustment for them to work as slave
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Please help me with my USBStreamer issue 2 years 1 month ago #39386

  • devteam
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@ Druid

We could be wrong but it sounds like a typical scenario for a loading issue. Too much impedance added to the system and a lack of an I2S buffer. Just grab an I2S buffer to buffer your clocks (LRCLK/SCLK/MCLK). It should solve all your issues.

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