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PostPosted: 13 Dec 2014, 22:49 
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Joined: 13 Dec 2014, 22:44
Posts: 1
I don't know how much you all know about circuit design around here but I was beginning to design a DAC around Texas Instrument's PCM1794A and had a few questions.

Firstly, I want to use a S/PDIF as an input. Since S/PDIF is toslink which is optical I'll need an optical receiver. I found one on Digikey http://www.digikey.com/product-detail/en/TODX2402F/TODX2402F-ND/655783.

The datasheet (http://media.digikey.com/pdf/Data%20Sheets/Toshiba%20PDFs/TODX2402.pdf) shows there is a high and low output and a few voltage inputs and ground pin. Back over on the PCM1794A's datasheet (http://www.ti.com/lit/ds/symlink/pcm1794a.pdf), however, it only shows one serial data input. How do I connect the output from the TOSLINK transceiver to the DAC? Do I need some kind of Digital Audio Receiver? (http://www.ti.com/product/DIR9001/technicaldocuments)


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PostPosted: 04 Feb 2015, 07:06 
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Joined: 30 Jan 2015, 10:15
Posts: 3
Haven't looked at the full Toshiba datasheet but obviously it has a 3.3V PECL differential output signal.
And the DAC is expecting a single ended TTL type input.
You will need a PECL to TTL converter that is rated for the voltage levels these provide/are expecting.
Something like this...probably not the best part available but it is appropriate for the job.
http://www.micrel.com/_PDF/HBW/sy100ept21l.pdf


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