ESS Sabre Reference DAC (8-channel) - Page 103 - diyAudio
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Old 12th October 2008, 12:24 AM   #1021
rossl is offline rossl  United States
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Output is isolated and coupled by Jensen output transformers that are capable of 0.0001% THD.

All inputs and outputs from the box are either optical or isolated by transformers. No DC connections other than the power safety ground. Absolutely no hum.
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Old 12th October 2008, 12:25 AM   #1022
rossl is offline rossl  United States
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Standard IEC power.
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Old 12th October 2008, 12:27 AM   #1023
rossl is offline rossl  United States
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Two coax and Two Toslink inputs are good to 192K.
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Old 12th October 2008, 12:29 AM   #1024
rossl is offline rossl  United States
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The equipment rack in my basement with Modified Oppo DVD player, DAC, Behringer DEQ2496 DSP equalizer in the processor loop, and a Sangean HD radio at the bottom. Not shown are the Popcorn Hour networked media player and plasma TV that comprise the four SPDIF inputs.
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Old 12th October 2008, 12:33 AM   #1025
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Quote:
Originally posted by rossl
Two coax and Two Toslink inputs are good to 192K.

Nice work!

Did you use the Wolfson SPDIF receiver to MUX?

Did you use a 40mhz clock?

Cheers!
Russ
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Old 12th October 2008, 12:43 AM   #1026
rossl is offline rossl  United States
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Quote:
Originally posted by Russ White



Nice work!

Did you use the Wolfson SPDIF receiver to MUX?

Did you use a 40mhz clock?

Cheers!
Russ

No, I am using CS8416. I didn't use Wolfson because of the 176K problem.

The DAC clock is 80 MHz Crystek. You can't really see it very well in the pics because it is surrounded by tall caps.
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Old 12th October 2008, 12:48 AM   #1027
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Quote:
Originally posted by rossl



No, I am using CS8416. I didn't use Wolfson because of the 176K problem.

The DAC clock is 80 MHz Crystek. You can't really see it very well in the pics because it is surrounded by tall caps.

Excellent!

I figured as much. I too find the CS8416 much more flexible and quite good. You actually can do 176K with the Wolfson, it just means jumping through hoops.

What sort of output IC did you fix your design around?

Cheers!
Russ
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Old 12th October 2008, 01:01 AM   #1028
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Quote:
Originally posted by Russ White



Excellent!

I figured as much. I too find the CS8416 much more flexible and quite good. You actually can do 176K with the Wolfson, it just means jumping through hoops.

What sort of output IC did you fix your design around?

Cheers!
Russ

I'm using OPA1632D. four of them.

The symmetrical balanced filter stage I ended up with is flat at 10KHz and down to -0.5dB at 20K.

The -3db point is 175KHz.

-27dB at 1.25MHz which is MCLK/64...

Simulated, not measured.

The caps used for the filter are WIMA and they are the orange ones you can see in post 1017

I'm listening to the DAC in six bit mode now. I have burned a PIC to use nine bit mode and I listened to that for a while.

I'm driving the wife crazy because I play the same songs over and over when I do the tweaks and the listening tests...

Of course, I have to play it loud to hear all the dynamic range



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Old 12th October 2008, 01:16 AM   #1029
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Quote:
Originally posted by rossl



I'm using OPA1632D. four of them.

Ah naturally!

Cheers!
Russ
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Old 13th October 2008, 03:37 PM   #1030
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Answers to some questions sent by email about the Prototype DAC pictured above.

First question. No, I didn't use J*cko H*mo's SPDIF input circuit for the coax inputs.
I did use the general philosophy that calls for the isolation of the received signal with transformer, then terminate and convert to logic level before coupling to the CS8416 with a cap.

Next question. No, I didn't provide for a DSD input to my DAC. In the setup pictured above, post 1024, the DVD player converts DSD to PCM. Adding a DSD input to the board would require another mux chip in front of the Sabre8. Also, I am not aware of a standard cable and connector for DSD.

Another question. It took me about 10 hours to hand solder the parts to the circuit board... Soldering the TSSOPs and LQFP is difficult and takes a lot of practice. So, it would not be practical to sell a bare board. I am looking into getting a professional assembly contractor to solder up a batch. This will be expensive.
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