Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 177 - diyAudio
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Old 24th December 2012, 01:56 AM   #1761
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Whats the voltages required again ??

5V ?
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Old 24th December 2012, 03:53 AM   #1762
AR2 is offline AR2  United States
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Originally Posted by qusp View Post
I really dont think that many of us are interested in SMPS
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Old 24th December 2012, 04:44 AM   #1763
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digikey sells 11.289 Mhz crystals for 0.52 ea
9B-11.2896MEEJ-B TXC CORPORATION | 887-1237-ND | DigiKey
they have 10 ppm accuracy
Replace the osc in the CD or DVD with this family of parts for
a 50x improvement over the 500 ppm part
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Old 24th December 2012, 04:53 AM   #1764
qusp is offline qusp  Australia
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I champion the use of high quality high current regulated SMPS for poweramps, where their benefits are quite obvious because making a 500-1000W regulated linear supply for such a task is both prohibitively expensive and double the size. you can forget shunt regs, except maybe for powering input differentials.

it is true that most noise can mostly be kept out of the audio band, but here we are dealing with circuitry that operates well above the audio band, the PSRR of a clock is terrible and its not hard to make a linear, shunt or battery supply for this purpose, so the trade off isnt in its favor.
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Old 24th December 2012, 05:33 AM   #1765
regal is offline regal  United States
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Quote:
Originally Posted by stocktrader200 View Post
digikey sells 11.289 Mhz crystals for 0.52 ea
9B-11.2896MEEJ-B TXC CORPORATION | 887-1237-ND | DigiKey
they have 10 ppm accuracy
Replace the osc in the CD or DVD with this family of parts for
a 50x improvement over the 500 ppm part
max 500 uW, I think means 3,3V only. The challenge is finding a 5V 11.2896mhz crystal.
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Old 24th December 2012, 04:43 PM   #1766
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Quote:
Originally Posted by qusp View Post
I champion the use of high quality high current regulated SMPS for poweramps, where their benefits are quite obvious because making a 500-1000W regulated linear supply for such a task is both prohibitively expensive and double the size. you can forget shunt regs, except maybe for powering input differentials.

it is true that most noise can mostly be kept out of the audio band, but here we are dealing with circuitry that operates well above the audio band, the PSRR of a clock is terrible and its not hard to make a linear, shunt or battery supply for this purpose, so the trade off isnt in its favor.
Then i will take 2 1KVA 40-0-40 25A SMPS to go :P
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Old 24th December 2012, 05:15 PM   #1767
qusp is offline qusp  Australia
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check out audiopower.it, the DPS500/S (lower v-out, 800W with 1000W burst)or DPS500/S-64V 800W not my design, but what i'm talking about. custom spec voltages are available for a bit more. i'm using the DPS600 in a custom format (bipolar front end supply at higher voltage than main high current output), they are cut from the same cloth, basically a digital class A amplifier powered by an 'SMPS' with very low noise and differential feedback

watch out for spam on the site, they are redesigning it and adding security, stay away from the datasheet links and you'll be fine =) I have them and can email if you are really keen.

Last edited by qusp; 24th December 2012 at 05:26 PM.
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Old 24th December 2012, 05:31 PM   #1768
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Quote:
Originally Posted by stocktrader200 View Post
digikey sells 11.289 Mhz crystals for 0.52 ea
9B-11.2896MEEJ-B TXC CORPORATION | 887-1237-ND | DigiKey
they have 10 ppm accuracy
Replace the osc in the CD or DVD with this family of parts for
a 50x improvement over the 500 ppm part
There are no specs about motional capacitance and Q in the datasheet.
40 Ohm ESR for a 10 MHz crystal, resistance welded.
Don't expect great performance in phase noise and then jitter.
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Old 24th December 2012, 06:06 PM   #1769
roger57 is offline roger57  Canada
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Quote:
Originally Posted by qusp View Post
I champion the use of high quality high current regulated SMPS for poweramps, where their benefits are quite obvious because making a 500-1000W regulated linear supply for such a task is both prohibitively expensive and double the size. you can forget shunt regs, except maybe for powering input differentials.

it is true that most noise can mostly be kept out of the audio band, but here we are dealing with circuitry that operates well above the audio band, the PSRR of a clock is terrible and its not hard to make a linear, shunt or battery supply for this purpose, so the trade off isnt in its favor.
I thought this was the " Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter" forum...?
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Old 24th December 2012, 06:08 PM   #1770
roger57 is offline roger57  Canada
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Originally Posted by AR2 View Post
+ 1
Totally agreed, and this is the wrong forum to be talking about "those things" anyhow.
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