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SPDIF coaxial and optical connections on DIT4096 and DIT4192

Mahendrakumar Reddy Ippagunta
Intellectual 575 points
Other Parts Discussed in Thread: DIT4192, DIT4096

All the reference designs from TI based on DIT4096 and DIT4192 use TX+ pin for SPDIF Optical out and TX- for SPDIF Coaxial out when both optical and coaxial outputs are provided. Is there any significance? Can we use TX+ for SPDIF coaxial and TX- for SPDIF Optical instead?

Also see the attached SPDIF COAX out circuit from CC85XX evaluation board schematic where R31(120 ohm) and R32(150 ohm) divide the output level of TX-. As per DIT4096 datasheet, TX- High level output voltage (Voh) is Vdd - 0.4V; which is 4.6V. With R31 and R32 voltage divider at the output,  voltage level of this SPDIF coaxial out will be approx 2.5V. This is far above the SPDIF Coax level of 0.5V. How will the receiver  expecting 0.5V level signal handle it?

Thanks in advance

-m