Impressions: USB DAC: TDA1387 NOS vs PCM5102A Delta-Sigma

[abraxalito]

A resistive divider could be used of course but would have poorer performance (rejection of supply noise/ripple and Zout) than the LED solution.

 

[snoopy33]

The seller removed the previous and is trying to flog this in it's place.

Aliexpress.com : Buy XMOS +CPLD USB digital interface Module I2S Output SPDIF Output DSD256 DAC Decoder Board With USB Seat from Reliable Digital-to-Analog Converter suppliers on Hi IC Store

I thought the only way to properly have minimal jitter is with an individual crystal. This doesn't have that.

 

[hollowman]

Looking at this to convert USB to I2S.

The TDA1387 has BCK, WS and DATA

WS = SCK?

snoop .... why do you keep showing this Cm6631a Interface Module in your posts?!!
If you're promoting it, or otherwise interested in it, use a DEDICATED THREAD!!!!!!!!!!

 

[snoopy33]

Because I am (or was) intending to make a PCB to fit over the top of it. The aliexpress seller is recommending the XMOS though.

 

[snoopy33]

Here's the variant of the filter/IV stage suited to 8 DACs.

In preparing this one I discovered there's a component error on the 4 DAC version, which I'll correct shortly.

I've also realized I didn't specify the type of LED - its a green one with 2.1V forward drop. The idea is that the DAC output voltage shouldn't rise above 3.5V (which is the upper limit of its compliance range). If it does, the resistor R15 should be increased to lower the voltage at the BC807's base.

Hi,

Could you post the kicad? save me drawing it out again. Thanks!

Also what needs to change for a single chip? I see you're using 5V in this version, I intend to go for 6V for the 2V swing you mentioned in an earlier post.

Andrew