denon 3930 pll

Marcelinho · 26th June 2009, 04:21 PM

Does the denon 3930 also have the poor pll-clock with 450ps jitter as the 2910 and the 3910 do?

I was considering to buy one secondhand, but only if they did a better job with regards to the clock.

esl 63 · 8th September 2010, 10:19 PM

I´m trying to figure out if I can modify that PLL too...

Marcelinho · 10th September 2010, 07:08 AM

The jitter specs of the pll of the 3930 is much better (about 50ps). I'm puzzled why it is fed with the output of a RAM-chip, instead of directly from a crystal.

For best audio change the clock of the dsp-chip and improve the power supply.

esl 63 · 10th September 2010, 11:15 AM

But isnt the DACs clocked with the 24.576 Mhz?
The DSP runs on 27MHz

Marcelinho · 10th September 2010, 12:41 PM

The chip that does the al-24 processing has the 24...Mhz clock and also does the spdif out. So it's a good candidate for reclocking.

27Mhz is used for al the video stuff.

dsp is clocked with 25Mhz

beardman · 10th September 2010, 01:44 PM

I have the Newclassd clock in the denon 3930---like the sound --

esl 63 · 10th September 2010, 01:54 PM

The music streem could go from the main processor through the FPGA and directly to the DAC if im not using the al24 processing.. right?

Marcelinho · 10th September 2010, 05:55 PM

Professional modders considder the 24...Mhz clock the most important for audio.
The fpga is connected to the "al-24" chip. In the blockdiagram you can considder them as one.
According to denon, all audio is al-24 processed.

SoNic_real_one · 10:29 AM

I am curious where did you get the 450ps value for the jitter?
The jitter on audio part is based on the 24MHz one when you are in PCM mode and on the 24.576MHz only in SACD DIRECT mode. Both are good clocks.

Marcelinho · 13th September 2010, 12:10 PM

The pll of The 3910 (sm8701) and the 2910 has a jitter-spec of 450ps with fs-frequencys higher then 48Khz (so 88,2K, 96K, 172K and 192K)

26th June 2009, 04:21 PM	#1
Marcelinho diyAudio Member Join Date: Oct 2005	denon 3930 pll Does the denon 3930 also have the poor pll-clock with 450ps jitter as the 2910 and the 3910 do? I was considering to buy one secondhand, but only if they did a better job with regards to the clock.

13th September 2010, 10:26 AM	#9
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	I am curious where did you get the 450ps value for the jitter? The jitter on audio part is based on the 24MHz one when you are in PCM mode and on the 24.576MHz only in SACD DIRECT mode. Both are good clocks. Last edited by SoNic_real_one; 13th September 2010 at 10:29 AM.

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8th September 2010, 10:19 PM	#2
esl 63 diyAudio Member Join Date: Aug 2010	I´m trying to figure out if I can modify that PLL too...

10th September 2010, 07:08 AM	#3
Marcelinho diyAudio Member Join Date: Oct 2005	The jitter specs of the pll of the 3930 is much better (about 50ps). I'm puzzled why it is fed with the output of a RAM-chip, instead of directly from a crystal. For best audio change the clock of the dsp-chip and improve the power supply.

10th September 2010, 11:15 AM	#4
esl 63 diyAudio Member Join Date: Aug 2010	But isnt the DACs clocked with the 24.576 Mhz? The DSP runs on 27MHz

10th September 2010, 12:41 PM	#5
Marcelinho diyAudio Member Join Date: Oct 2005	The chip that does the al-24 processing has the 24...Mhz clock and also does the spdif out. So it's a good candidate for reclocking. 27Mhz is used for al the video stuff. dsp is clocked with 25Mhz

10th September 2010, 01:44 PM	#6
beardman diyAudio Member Join Date: Jan 2005 Location: a littlee town in western denmark	I have the Newclassd clock in the denon 3930---like the sound --

10th September 2010, 01:54 PM	#7
esl 63 diyAudio Member Join Date: Aug 2010	The music streem could go from the main processor through the FPGA and directly to the DAC if im not using the al24 processing.. right?

10th September 2010, 05:55 PM	#8
Marcelinho diyAudio Member Join Date: Oct 2005	Professional modders considder the 24...Mhz clock the most important for audio. The fpga is connected to the "al-24" chip. In the blockdiagram you can considder them as one. According to denon, all audio is al-24 processed.

13th September 2010, 12:10 PM	#10
Marcelinho diyAudio Member Join Date: Oct 2005	The pll of The 3910 (sm8701) and the 2910 has a jitter-spec of 450ps with fs-frequencys higher then 48Khz (so 88,2K, 96K, 172K and 192K)

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