ESS Sabre Reference DAC (8-channel) - Page 3

abzug · 13th February 2008, 06:31 PM

Quote:

Originally posted by borisov57
All dac measures about the same, best SNR has PCM1794 with active I/V and lowest THD AD1955, but I am at limit of my measuring analog to digital converter.

Not really. Did you measure linearity? Did you measure settling time? Did you measure jitter rejection?

Anyway, I talked to Dustin on the phone earlier and I have a bit more info: external clock can be used after all, the filter shown on the diagram on the outputs is not switched capacitor but a programmable notch filter, the jitter filter has bandwidth < 0.1 Hz, and the digital filter is 256 tap FIR.

Dougie085 · 13th February 2008, 06:38 PM

Is there a PDF somewhere that shows the pinout of the chip? Can't seem to find one.

ESS_Blammo · 13th February 2008, 07:16 PM

Pinout of which chip?

Dougie085 · 13th February 2008, 07:40 PM

This new DAC.

nogoodboyo · 13th February 2008, 08:32 PM

Hi DustFor99,

Please consider me for an eval board.

I currently have: AD1955, PCM1798, WM8740, TDA1543 (Active I/V) and the DAC in PCM2707 for comparison.

My Audio System consists of various SS amps, Tube Amps, SS pre-amps and Tube Pres. Horn, Electrostatic, Full-range and "conventional" speakers.

Thanks

Andrew

borisov57 · 14th February 2008, 07:23 AM

Hi abzug,

SNR results for all DACs were from 116.7 to 118.1 dB and THD 2V RMS into about 500 Ohms were between 0.0004 to 0.0009%.
Did you measure jitter rejection?

Best regards

abzug · 14th February 2008, 07:53 AM

What frequency did you measure at? THD generally increases when you get above 10 K, and a lot. But I don't see this for this DAC.

Looking at detailed measurements PDF sent to me by ESS, claiming measured by a third party, THD+N vs jitter starts at least 15 dB better than top DACs from the two usual suspects, to 45 dB better, depending on jitter frequencies. It's also flat, unlike the other two DACs which show increasing significantly with frequency. Also, intermodulation is lower and phase response better, and the crosstalk is 15-20 dB lower. For me the best feature in this DAC is the digital filter.

borisov57 · 14th February 2008, 08:38 AM

Yes, measured figures for sabre dac looks very impressive, that is why I would love to try it. My result for THD are for 1 kHz, 2V RMS driving 500E input impedance AD converter. Bandwidth is 20 kHz.

Dougie085 · 14th February 2008, 11:07 AM

Quote:

[i]PDF sent to me by ESS, claiming measured by a third party[/B]

Anyway you can post that PDF up?

abzug · 14th February 2008, 11:59 AM

I don't know if I have permission to post the datasheet, but on the comparisons it says I can forward them to other people interested, so if you PM me I'll email it back. However, I think it was mentioned in this thread they intend to post more data on the web anyway.

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13th February 2008, 06:38 PM	#22
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Is there a PDF somewhere that shows the pinout of the chip? Can't seem to find one.

13th February 2008, 07:16 PM	#23
ESS_Blammo diyAudio Member Join Date: Feb 2008	Pinout of which chip?

13th February 2008, 07:40 PM	#24
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	This new DAC.

13th February 2008, 08:32 PM	#25
nogoodboyo diyAudio Member Join Date: Dec 2004 Location: SF Bay Area	Hi DustFor99, Please consider me for an eval board. I currently have: AD1955, PCM1798, WM8740, TDA1543 (Active I/V) and the DAC in PCM2707 for comparison. My Audio System consists of various SS amps, Tube Amps, SS pre-amps and Tube Pres. Horn, Electrostatic, Full-range and "conventional" speakers. Thanks Andrew

14th February 2008, 07:23 AM	#26
borisov57 diyAudio Member Join Date: Feb 2002	Hi abzug, SNR results for all DACs were from 116.7 to 118.1 dB and THD 2V RMS into about 500 Ohms were between 0.0004 to 0.0009%. Did you measure jitter rejection? Best regards

14th February 2008, 07:53 AM	#27
abzug Account Disabled Join Date: Jan 2006 Location: whereisit	What frequency did you measure at? THD generally increases when you get above 10 K, and a lot. But I don't see this for this DAC. Looking at detailed measurements PDF sent to me by ESS, claiming measured by a third party, THD+N vs jitter starts at least 15 dB better than top DACs from the two usual suspects, to 45 dB better, depending on jitter frequencies. It's also flat, unlike the other two DACs which show increasing significantly with frequency. Also, intermodulation is lower and phase response better, and the crosstalk is 15-20 dB lower. For me the best feature in this DAC is the digital filter.

14th February 2008, 08:38 AM	#28
borisov57 diyAudio Member Join Date: Feb 2002	Yes, measured figures for sabre dac looks very impressive, that is why I would love to try it. My result for THD are for 1 kHz, 2V RMS driving 500E input impedance AD converter. Bandwidth is 20 kHz.

14th February 2008, 11:59 AM	#30
abzug Account Disabled Join Date: Jan 2006 Location: whereisit	I don't know if I have permission to post the datasheet, but on the comparisons it says I can forward them to other people interested, so if you PM me I'll email it back. However, I think it was mentioned in this thread they intend to post more data on the web anyway.