Nuvoton CODEC 8812 series User Manual

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Nuvoton CODEC 8812 series User Manual Manual pdf 50 page image

CODEC Motherboard Manual Version 1.3 Page 50 of 66 April 12, 2016CODEC Motherboard25 Digital Audio OutputThere are three methods to stream digital audio from the NAU8822 audio data interface to themotherboard or external devices. These paths are set up using the appropriate connectors, andalso, using the W681308 microcontroller managed by the GUI Application software to set up thepaths accordingly.25.1 Formatted Digital AudioA serial audio transceiver that supports AES/EBU, UEC958, S/PDIF, EIAJ CP340/1201 serialdigital audio formats is included on the motherboard. Audio data from the NAU8822, and clockinformation to or from the NAU8822 may be routed to the transceiver under control of theW681308. The audio data from the NAU8822 ADC will then be available on the S/PDIF serialoutput from RCA jack, J9.When the W681308 has configured the motherboard to use the S/PDIF transceiver, the I2S audioand clock signals to/from the NAU8822 are available on header J7.25.2 USB AudioAudio data in mono format can be streamed from the NAU8822 ADC to the USB host through theW681308 microcontroller. USB audio is in a standard USB isochronous stream format.25.3 Unformatted AudioBi-directional serial audio may be connected directly to a device on the daughter card via the J15serial audio connector. Although J15 is labeled on the motherboard as an I2S port, this port maybe used for either I2S or PCM (DSP mode) audio data modes as determined by the externaldevice connected to the J15 header. The path to use the J15 header is managed by theW681308 microcontroller. Level shifters are included on the motherboard to adjust signal levelsappropriately for the voltages selected for the device on the daughter card.