Or is it black magic. 🤣
I can't remember now if the PCM1702 ran at 384k. I think so, but I could be wrong.
I can't remember now if the PCM1702 ran at 384k. I think so, but I could be wrong.
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@eclipsevl You know how they quaranteed this specification on AD1865. They made testing on slower BCLK, only 18-bit FS LRCK (768 kHz * 18 = 13.8 MHz for BCK) - only mono.
So does the AD1862, 16x oversampling in datasheet ... that is 768 kHz * 20fs (only mono) = 15.36 MHz for BCK
So does the AD1862, 16x oversampling in datasheet ... that is 768 kHz * 20fs (only mono) = 15.36 MHz for BCK
One thing, it is states it's minimum clock rate 13.5Mhz for ad1865 😉 So they left quite a large questwork of maximum frequency. In ds, figure 13, there is 16.9344Mhz xin with cdx1244 digital filter. So higher is definitely possible.
Fired it up. Plays music. But only through the Left channel. Measured AC voltage out from the D1 RCA's out, I can see a half volt on the left and negligible on the left. Thinking I may still not have the JLS I2s over USB pins correct.
Resolved dead left channel. My error, neglected to solder the # nine female receiver header pin on the underside of the DAC board. Next step, burn in and optimization. Need to try changing R4 on the D1 from 1k8R to max 2kR, as my system is low gain.
He is using NP D1. Such a drastic change will affect the operation of the other area of the circuit, and there are other resistors to be changed in the correct ratio. Iirc, there is also a need to raise the bipolar voltage to somewhere like 40V to maintain the drain current of the MOSFETs to allow higher IV resistors.