S/PDIF and I2S Interface for a SigmaDSP Codec Using the ADAV801/ADAV803 Audio Codec (CN0219)
S/PDIF (Sony/Philips Digital Interface) is a high quality digital audio format that is commonly used in consumer electronics and is used to interconnect audio equipment. Many audio codecs/DSPs only support I2S as digital audio input/output, which is a problem when using these parts in circuits that need to support both S/PDIF or the AES (Audio Engineering Society) professional standard.
The audio input in S/PDIF format is converted to I2S before processing by the ADAU1761, and the processed audio output in I2S format is converted back to S/PDIF by the ADAV801/ ADAV803. The ADAV801/ ADAV803 has a flexible digital input/output routing matrix that allows it to process audio in either I2S or S/PDIF format and output it in either format as a master or slave with the use of an onboard SRC (sample rate converter). The ADAV801/ ADAV803 support the consumer audio standard, and channel status data can be embedded in the audio stream by writing to the relevant registers in the ADAV801/ ADAV803. This is a useful feature for passing configuration information between devices. The ADAV801/ ADAV803 has a stereo DAC/ADC that can also be used to process audio as needed.
Figure 1. ADAV801/ADAV803 Connections for S/PDIF In/Out to ADAU1761 SigmaDSP (Simplified Schematic: Power Supply Decoupling and All Connections Not Shown)
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