Aaaaaand here we go again 
Ended up managing to "move up in the world", as it were, and upgrade my recording rig, and was fortunate enough to catch one of these babies "locally", for a smidge over half the price of a brand-new one (700eu versus 1200+)
"Before" photos illustrate my issue (a pet-peeve, if you will) - chock full of Lelon (blue), Meritek (black), and a couple of SWC(?) and Teapos plus a JunFu in the power supply.
Some cool design features, though - diode clamps on ALL analog inputs and outputs (in the form of those DIP-cased rectifier bridges), the casing's made out of two identical cast aluminium pieces, PGA2500's on each analog input, all opamps are Rohm BA4580R's, apart from a whole bunch of ST TS922's between the PGA's and the two CS5368 ADC's (8ch each); AKM AK4396 DAC's.
Odd thing though, but i think they're "cheating" a bit In its internal DSP mixer, you can flip the phase, but i've got a hunch that each analog in is routed to TWO ADC channels, with opposed phases, and depending on whether the phase-flip option is active or not, the "appropriate" ADC input is selected.
The Xilinx Spartan, my hunch is, is used mostly for routing the audio between the outside connections (analog i/o, digital i/o, computer connections) and the DSP chip (TI TMS320C6722). At least that's my (semi)educated guess, going by the traces going to and from it. The "brains" of the whole thing must be that Atmel microcontroller (AT91SAM7S256) - datasheet says it has some ARM7 core, and that 8-pin flash is nearest to it, so...
Ended up managing to "move up in the world", as it were, and upgrade my recording rig, and was fortunate enough to catch one of these babies "locally", for a smidge over half the price of a brand-new one (700eu versus 1200+)
"Before" photos illustrate my issue (a pet-peeve, if you will) - chock full of Lelon (blue), Meritek (black), and a couple of SWC(?) and Teapos plus a JunFu in the power supply.
Some cool design features, though - diode clamps on ALL analog inputs and outputs (in the form of those DIP-cased rectifier bridges), the casing's made out of two identical cast aluminium pieces, PGA2500's on each analog input, all opamps are Rohm BA4580R's, apart from a whole bunch of ST TS922's between the PGA's and the two CS5368 ADC's (8ch each); AKM AK4396 DAC's.
Odd thing though, but i think they're "cheating" a bit
In its internal DSP mixer, you can flip the phase, but i've got a hunch that each analog in is routed to TWO ADC channels, with opposed phases, and depending on whether the phase-flip option is active or not, the "appropriate" ADC input is selected.The Xilinx Spartan, my hunch is, is used mostly for routing the audio between the outside connections (analog i/o, digital i/o, computer connections) and the DSP chip (TI TMS320C6722). At least that's my (semi)educated guess, going by the traces going to and from it. The "brains" of the whole thing must be that Atmel microcontroller (AT91SAM7S256) - datasheet says it has some ARM7 core, and that 8-pin flash is nearest to it, so...
Attached Files
Plus a handful of Nichicons, and a Rubycon in the PSU 
Shocking, i know :P
Comment