heya guys,
I'm toying with the idea of an 8 channel AD converter for use with one of those behringer control surfaces with ADAT i/O.
For increased functionality, I'd like to build it from 4 x stereo ADC cards. (which could be used for other things in the future)
My initial thought would be to use the front end from the EVM (because our EVM's are capable of the full 118dB) and have S/PDif outputs for each channel as well as the capability to use an ADAT optical for 8 channels of 44.1KHz or 48KHz
I personally don't think it'd be a LOT of hard work (especially if one or two of you can help! - especially with the analogue) and I'd be more than happy to put the schematics on here or sell PCB's.
Anyway, to the point of my post... I really don't fancy building a PLL to generate the various clocks from the word-clock. So, for word clock generation, I have a few options (and was hoping for your input).
1) Onboard crystals - the rest of the system would have to accept my word clock through either S/PDIF or ADAT.
2) Take an S/PDIF input from the PC.
3) Use an external ADAT input.
I have concerns with each of them though....
1) What if my crystal isn't good enough to clock the system?
2) What do I need an S/PDIF input for - would you really want to waste one of your S/PDIF outputs?
3) I'm not wasting an ADAT output for a clock!
Arghhh... any inputs you guys have would be appreciated.
Cheers
Rochey
I'm toying with the idea of an 8 channel AD converter for use with one of those behringer control surfaces with ADAT i/O.
For increased functionality, I'd like to build it from 4 x stereo ADC cards. (which could be used for other things in the future)
My initial thought would be to use the front end from the EVM (because our EVM's are capable of the full 118dB) and have S/PDif outputs for each channel as well as the capability to use an ADAT optical for 8 channels of 44.1KHz or 48KHz
I personally don't think it'd be a LOT of hard work (especially if one or two of you can help! - especially with the analogue) and I'd be more than happy to put the schematics on here or sell PCB's.
Anyway, to the point of my post... I really don't fancy building a PLL to generate the various clocks from the word-clock. So, for word clock generation, I have a few options (and was hoping for your input).
1) Onboard crystals - the rest of the system would have to accept my word clock through either S/PDIF or ADAT.
2) Take an S/PDIF input from the PC.
3) Use an external ADAT input.
I have concerns with each of them though....
1) What if my crystal isn't good enough to clock the system?
2) What do I need an S/PDIF input for - would you really want to waste one of your S/PDIF outputs?
3) I'm not wasting an ADAT output for a clock!
Arghhh... any inputs you guys have would be appreciated.
Cheers
Rochey