Well, in your dual mono you have a buffer with surely min 100ps output skew from clock buffer....
Even if not interested in a quad mono config, this board could also be used for dual mono setup with an external clock and the remaining two LVDS traces terminated.
Doesn’t the -01 version of the 1121 use a 570 clock? Why not use one of them as master rather than putting the 570 clock on your PCB? Or do you already have -02 1121s?
Yes it has.
I set it up like this in my dual mono config.
I figured, that clock timing is something important, and it would be best, if the clocks on the 4 dam1121s run as synchron as possible.
The LVDS buffer have inter-output skews, that will (with the clock coming from one board) add on to the input to output delay of the LVDS buffer itself.
That means with off board clock, only the output skew will differ between the the boards.
In addition you can easily connect an independent voltage source to the clock.
At the moment I'm waiting for some answers from soekris.
One question is, weather I can connect the LVDS to the 4 dam1121s AC coupled.
Happy Christmas, Søren. Are we any closer to 4K filters for the much-loved 1121?
Just asking....🙂
Just asking....🙂
Hello. Have any one compared fully modded dam 1021 between dam 1121? I dont seen any mods with 1121.
Well some did an output filter Cap mod. Either removal or replacement of it.
I haven’t heard any modded 1021 yet.
Yeah! That 1121 mod was a good one; reduced the top end glare and improved the bass extension. Thanks for sharing!
I have change stock filter capacitor for 1,2nf styroflex, but lots of diyers just play with no capacitor and say is better , better hights. Rest od my 1021 dam is powered by life po4 bateries, with no i2s isolators. Rest not modded things for now are capacitor between fpga and shifts, and a clock. Not much info about a clock yet.
Please Sören - honor your previous promise and make 4k taps available for this very nice DAC board.
// TNT
// TNT
.... or if you made an oppsie and it has become clear that it is not possible due to ge clock solution - then say so and we can all move forward... it's the waiting thats frustrating....
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4K filters for dam1121 is on top of my to do list, although the clocking complicates things, the FPGA code is updated, just need to update the uC code and the test setup is ready on my work desk.... But it will have to wait a little as I'm currently down with a really bad stomach flu....