DAC AD1862: Almost THT, I2S input, NOS, R-2R

[NIXIE62]

Or is it black magic. 🤣

I can't remember now if the PCM1702 ran at 384k. I think so, but I could be wrong.

 

[eclipsevl]

Ad1865 datasheet says it works up to 16x oversampling, which is 768kHz. So I do not see mystery here 🙂

 

[miro1360]

@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

 

[Brijac]

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.

 

[JKiriakis]

Thanks @zoom777 and @eclipsevl. Added Pin 9, removed J4 and closed J3 and J6. Now on to fixing the negative rail of shunt regulator powering D1 output, the final task before first full fire-up. Appreciate your help!

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.