Hi...
New in diyaudio town...
Was wondering if an A/D adat convertor could be made with 16 balanced ana in's which get routed to 2 adat outs (2x8). Much like the Korg 880 A/D, with trim pots on the front panel controlling level - cept this box would have 16 chans not 8...
Any ideas/feedback appreciated...
Cheers...
New in diyaudio town...
Was wondering if an A/D adat convertor could be made with 16 balanced ana in's which get routed to 2 adat outs (2x8). Much like the Korg 880 A/D, with trim pots on the front panel controlling level - cept this box would have 16 chans not 8...
Any ideas/feedback appreciated...
Cheers...
Yep, use the ADC of your choice and then Alesis' AL140x chip to get the ADAT encoding. Not too tough technically.
I think routing the stereo pairs is a snap, if you want to route inside the pairs, then you have to get a little fancy on the analog side, or very fancy on the digital side.
The en/decoder accepts 4 stereo clock-locked serial streams, so you are free to use simple digital logic to handle the routing. The only thing to be concerned with is clock skew if some signals will be processed much more than others. Shouldn't be a problem IMHO.
The en/decoder accepts 4 stereo clock-locked serial streams, so you are free to use simple digital logic to handle the routing. The only thing to be concerned with is clock skew if some signals will be processed much more than others. Shouldn't be a problem IMHO.
thanks again...😉
i get the basic 4 stereo pair routin, but the 'simple digital logic gates' part lost me a bit
...
If possible could you direct me to summin that could enlighten me on the caper - pref. summin visual, it'd b appreciated...
rspx
i get the basic 4 stereo pair routin, but the 'simple digital logic gates' part lost me a bit
...If possible could you direct me to summin that could enlighten me on the caper - pref. summin visual, it'd b appreciated...
rspx
I would start with something simple. We are switching 1 serial line since the other signals are common (remember skew!!), so route all eight lines to four 8:1 multiplexors, and route the mux outputs to the four inputs of the OptoGen encoder. Repeat for the second Optogen (four more muxes with all eight inputs driven) Now you can send any line to any slot (1-4) on either ADAT interface.
My first thought is that trying to route that with standard logic on a 2-layer board is going to look something awful, so you might want to combine the eight muxes into a PLD. Francios is familiar with this; I've never taken a crack at programmable logic myself. If you don't go that route I would use some resistor networks to your advantage; this is the best way I've found to route this kind of layout. See the attachment; about the middle of the board you'll see an array being used in this manner. Bad for crosstalk, so I ultimately abandoned this layout.
This project is technically very simple but is probably going to require a uP unless you are very clever, so I'm not sure I would recommend it if you are unfamiliar with these concepts.
My first thought is that trying to route that with standard logic on a 2-layer board is going to look something awful, so you might want to combine the eight muxes into a PLD. Francios is familiar with this; I've never taken a crack at programmable logic myself. If you don't go that route I would use some resistor networks to your advantage; this is the best way I've found to route this kind of layout. See the attachment; about the middle of the board you'll see an array being used in this manner. Bad for crosstalk, so I ultimately abandoned this layout.
This project is technically very simple but is probably going to require a uP unless you are very clever, so I'm not sure I would recommend it if you are unfamiliar with these concepts.
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