There are lots of opinions about digital noise.... Galvanic isolation is always good, but you can also get far with reclocking, seperate analog power and observing good grounding and shielding.
The dam1121 datasheet spec say 4.5V to 5.5V so that is what it is. The vref opamps are actually 5V types so 6.5V is beyond manufacturers specs.
yeah got it 20ma and peak 50ma.
But is i2s and Optical input are both routed through the galvanic isolation?
The dam1121 don't have any isolators on it, please see dam1121 manual for example schematics with isolators on I2S.
Yes, see manual for p/n. You might need newer firmware, but I will release that shortly, Yes, shortly, working on firmware right now.
My implementation is pretty straightforward:
PC (8-ch crossover/delays/DRC) -> USBstreamer I2S out -> 4 x dam1021 (bitclock and wordclock in parallel).
There's some suspicion of sync issues in this config, I can't hear it, so you're probably right that several boards sync within one wordclock period. Can be verified with impulse response measurements.
Many people would like to implement crossovers with a 2-channel source and multiple DAMs, but it's currently impossible to manage delays/time alignment due to hardware limitations of the dam1021/1121.
Anyone else with active crossover/multichannel setup?
What software are you using to generate the filters?
Edit: I see this was answered on the following page. Has anyone had success using USBStreamer/multiple DAM with Acourate?
DAM1121 Manual have eight page only
Which page can I find the PN of si570?
I cannot be find at 1121 manual.
Please help
Thanks alot
Seems like I remembered wrong, but the p/n I use is Silicon Labs 570BAC000112DG, others might work, but no guarantees....
Finally got around to trying the 1121. Straightforward setup as a basic stereo unit and playing fine.
However, I can't get the serial port to produce anything but gibberish.
I use HyperTerm as my default but also tried RealTerm and PuTTY - same result.
If I remove the 1121 and connect a 1021 all works as it should.
It seems to be connected properly as, on bootup, it outputs gibberish and if I change tracks more gibberish. I have tried with/without a ground wire, have tried all the Display options in RealTerm (ANSI, ASCII etc), tried the invert option in RealTerm, tried a different power supply on the 1121, tried different conspeeds on the terminal/PC.
Am I missing something here....
However, I can't get the serial port to produce anything but gibberish.
I use HyperTerm as my default but also tried RealTerm and PuTTY - same result.
If I remove the 1121 and connect a 1021 all works as it should.
It seems to be connected properly as, on bootup, it outputs gibberish and if I change tracks more gibberish. I have tried with/without a ground wire, have tried all the Display options in RealTerm (ANSI, ASCII etc), tried the invert option in RealTerm, tried a different power supply on the 1121, tried different conspeeds on the terminal/PC.
Am I missing something here....