Hello guys!
I'm back with another problem that confuses an electronics noob like me.. Its called SPDIF..
I have tried really hard to understand this signal form. Mainly the RCA/Coax version has been tricky for me. However, I think I finally understand it. I just need a sanity check from all the smart heads in here.
I'm trying to make and SPDIF interface module for my DIY ADAU1466 DSP.
The module has:
The SPDIF_IN goes directly from here to a connector and then to the DSP boards SPDIF Input. The Output likewise to the DSP boards SPDIF Output.
The DSP core board has the ADAU's SPDIF_RX connected direcctly to a connector and the SPDIF_TX pin is terminated with an 47R resistor as it exits the DSP and then straight to the connector like this:
I have been very much in doubt if I need a buffer of sorts on the RCA input/output. But according to Analog Devices the ADAU1466 should be able to both read the input and drive the output directly with its pins. This is also confirmed by one of their EVAL boards:
Im just not sure how a 0-0.6V signal can trigger the input when it is centered at 1.65V? But I guess there is more going on behind the scene that I have no clue about?
Thanks in advance guys!
I'm back with another problem that confuses an electronics noob like me.. Its called SPDIF..
I have tried really hard to understand this signal form. Mainly the RCA/Coax version has been tricky for me. However, I think I finally understand it. I just need a sanity check from all the smart heads in here.
I'm trying to make and SPDIF interface module for my DIY ADAU1466 DSP.
The module has:
- Toslink and RCA inputs.
- The inputs can be selected with a switch sticking through the rear panel between the two connectors.
- There are two LED's used to indicate which input is live.
- The switch can also be placed in a center position(or not installed at all) to allow the DSP or a uC to select the input type.
- RCA output.
- It uses transformers for galvanic isolation on both RCA connectors.
- Will be used to accept inputs from my PC(toslink) or streamers like WIIM and so on(RCA and Toslink).
- The RCA output is mainly intended to daisy chain multiple dsp units or to connect a subwoofer.
The SPDIF_IN goes directly from here to a connector and then to the DSP boards SPDIF Input. The Output likewise to the DSP boards SPDIF Output.
The DSP core board has the ADAU's SPDIF_RX connected direcctly to a connector and the SPDIF_TX pin is terminated with an 47R resistor as it exits the DSP and then straight to the connector like this:
I have been very much in doubt if I need a buffer of sorts on the RCA input/output. But according to Analog Devices the ADAU1466 should be able to both read the input and drive the output directly with its pins. This is also confirmed by one of their EVAL boards:
Im just not sure how a 0-0.6V signal can trigger the input when it is centered at 1.65V? But I guess there is more going on behind the scene that I have no clue about?
Thanks in advance guys!