Hi,
Product design the using PCM2900C, it has a operation verification.
Problem has been confirmed.
It indicates the problem below.
① connection notebook PC and PCM2900C mounted product with a USB cable
② output the sound from the notebook PC
③ disconnect the USB cable while output a voice, re-inserted immediately
④ Output voice is increased from PCM2900C
(In the case of a 1kHz sine wave, about four times the normal amplitude)
<< Other supplemental >>
④ once they become of the state ...
・Incurable also of note PC voice output software and restart
・If you change the dB setting of voice output software of the notebook PC,
incurable change remains four times
・Heal and change the volume from the sound set of windows
(If the speaker setting was 50, it has healed and re-set to 50 from to change once)
・Unplug the USB, heal and re-inserted from waiting from the sound settings
until there is no display of "USB AUDIO CODEC" (3 seconds position)
③ at the time of, it was confirmed the power and reset system of the waveform,
PCM2900C of VBUS, nSSPND had immediately fallen to near zero.
VCCI and VCOM was maintained to be a more than 1V.
(Power and reset system of HUB-IC in the previous stage of the PCM2900C had fully fallen normally)
Notebook PC is windows10, windows8.1, 100% near will occur in the same way in windows7.
The driver of Ver is "USB AUDIO CODEC" (6.1.7601.18208).
Please tell me how to resolve.
Best regards
