Noise, or silence on startup of ADAU1701 board.
Thread Summary
The user is experiencing issues with the ADAU1701 DSP where it sometimes gives no sound or loud static, or only works on the first channel during startup. The final answer suggests that the problem may have been resolved offline or through a multi-part answer, and directs users to post new questions if further assistance is needed. Accompanying answers recommend following the initialization sequence in SigmaStudio and checking the PCB layout for the 12MHz crystal oscillator and PLL, as these components are sensitive to layout issues.AI Generated Content
I've made a board using the ADAU1701 dsp, but am having some strange problems when it starts. I'm loading it via a microcontroller, and it starts up, and does the I2C transfer just fine, but sometimes it gives no sound, or just loud static, or it will work normally, but only on the first channel.
Any thoughts what could be causing this?
Audio Signal Processors
SigmaDSP Audio Processors
adau1701
Hello,
Are you following the initialization sequence matching the sequence in SigmaStudio? Please try to emulate the communication sequence as closely as possible. Here is a video explaining how to use the Capture Window to follow the download sequence:
http://videos.analog.com/video/applications/automotive/756712926001/SigmaStudio-C2-Capture-Window/
You can also follow this tutorial to generate the microcontroller code to initialize the chip:
Hi Nickw,
After confirming the content and sequence of your I2C writes, any remaining problems may be hardware related. For example, the 12MHz crystal oscillator and PLL are sensitive to layout, as described in these docs:
https://ez.analog.com/message/33074#33074
https://ez.analog.com/docs/DOC-1889
Best regards,
Bob
This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.
Thank you,
EZ Admin
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