CS4397 dac

**jonners** · 29-05-2008, 11:08

My DAC has finally arrived and I have it up and running (optical input). However, it operates on 44kHz and 48kHz sample rates but not on 96kHz. I'm a bit out of my depth here, but from my reading of the CS4397 data sheet it looks as though for 96kHz operation I need to connect M4 (pin 2) to +3.3V. (It's currently connected to Ground). Can anyone - Leo?? - confirm if I've got that right?
If I am right, changing it looks unfortunately like it would be rather a delicate operation. The board was advertised as a 24bit/192kHz DAC so it seems a bit amiss for it to be currently incapable of selecting the higher sampling rates.

**Filterlab** · 29-05-2008, 11:13

Optical (TOSlink) will only carry a maximum of 48Khz. For 96Khz and above you'll need to use an electrical connection. However the upsampling will still go to 192Khz as long as the input is 24bit (48Khz, 96Khz, 192Khz or multiples/divisions thereof).

**jonners** · 29-05-2008, 13:21

Originally Posted by Filterlab

Optical (TOSlink) will only carry a maximum of 48Khz.

Thanks - that bit of information has somehow passed me by.

Will organise elec. input asap.

**jonners** · 29-05-2008, 16:50

I now have electrical input, but still nothing doing at 96kHz - just lots of hiss.

**Filterlab** · 29-05-2008, 17:37

Is your input definitely 24bit?

**jonners** · 29-05-2008, 17:56

Yes. I can select 16, 20 or 24bit output on my Behringer SRC2496 upsampler. 44 and 48kHz work OK at all bit rates, 96kHZ at none.

**Filterlab** · 29-05-2008, 18:38

How odd. Without being there I'm at a bit of a loss to be honest. Maybe Leo can help more.

**jonners** · 31-05-2008, 16:43

I wonder if the problem could be as a result of the PPL filter having the wrong values - as noted by Leo when he started this thread? I haven't changed anything on my board yet.

**jonners** · 01-06-2008, 18:32

New PLL filter values are in (not SMD though) - they improve the sound but there's still nothing doing at 96kHz.

**iihay** · 04-06-2008, 20:53

Just got a load of caps in the post today Oscons and wima as per the lampucera site, will be having a crack at my board this weekend. What's the best approach with smd caps, am I ok just sticking the new cap across it or is it better to get the little blighters off first?

Cheers

Iain

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