AK4493 Coaxial Fiber Digital Audio DAC Decoder Board CSR8675 Bluetooth 5.0 APTX HD AK4118 Receiver Support XMOS Usb 24bit From Zuny, $135.43 | DHgate.Com
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CSR8675 programming guide w. software and tons of CSR info | Page 12 | diyAudio
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Adding CSR8645 or CSR8675 module board to AUX-IN/USB box | Lexus CT200h Forums