Hi,
I’ve been attempting to connect my Up2stream Mini V3 to a MA12070P amplifier. However, I’m experiencing issues with the I2S output. Instead of a clear signal, I’m encountering various types of noise, hum, and distortion.
I’ve taken some diagnostic steps, including connecting a 4-channel oscilloscope to the board. It appears that the BCKL (Bit Clock) and sample rate seem fine. However, I’m facing challenges with the actual data signal, which doesn’t seem to be making sense.
To further investigate, I connected the Mini V3 to an Analog Discovery 2 with a logic analyzer to decode the I2S signal. Unfortunately, the output from the analyzer mirrors the issues I’m experiencing when connected to the amplifier. I’ve experimented with different combinations, adjusting sample rates, formats, PLL clocks, and more, but I haven’t been able to get anything working. I can’t even decode the I2S signal in any format using the Analog Discovery 2.
Just to rule out the amplifier as the source of the problem, I tried connecting it to an adau1701, which worked perfectly fine with the amplifier. Additionally, I was able to read the I2S signal from the adau1701 using the Analog Discovery 2 without any issues.
I’ve attached two pictures that show the current settings on APCworkbench and the Waveforms logic analyzer for the I2S data signal. Yes, I’ve tried numerous combinations with different formats, sample rates, word lengths, and more. I’ve tested this with three different Mini V3 units, and the issue persists on all three.
In the picture a 4khz test tone is applied. However i get random square waves, and other wierd outputs depending on the format
Any insights or suggestions on how to resolve this would be greatly appreciated.