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Old 28th December 2003, 08:42 AM   #1
avian is offline avian  Australia
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Default a shift register fast enough for AD1865?

Hi,
Im bout to build a CS8414 + AD1865 based project, but want to tackle the interchannel delay problem with an 18bit static shift register.. The problem is I cant find anything fast enough (either clock rate or latency wise). Can anyone here suggest any quick ICs to do the job?

Cheers
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Old 28th December 2003, 12:01 PM   #2
AD1865 is offline AD1865  China
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Default It's useless to do that

I have build CS8414 + AD1865, it useless to synchronize the L/R channel. Because you can't hear the interchannel delay. How to bulid analog filter is more important.
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Old 28th December 2003, 03:20 PM   #3
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Default Re: a shift register fast enough for AD1865?

At a 44K1 sample rate SCLK runs at 64Fs which is 2.8224 MHz. The notion that you cannot find something fast enough is ridiculous.
http://www.philipslogic.com/products/shiftregisters/
http://parametric.fairchildsemi.com/...StepSearch=yes
http://focus.ti.com/docs/logic/catal...n=product_list
http://www.onsemi.com/site/products/...mnID=0&action=
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Old 28th December 2003, 03:38 PM   #4
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Hi all,

I would be interested in the schematic of such a DAC. Anyone got one for me?

Best regards,
Thijs
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Old 28th December 2003, 11:51 PM   #5
avian is offline avian  Australia
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Default Re: Re: a shift register fast enough for AD1865?

Quote:
Originally posted by rfbrw
At a 44K1 sample rate SCLK runs at 64Fs which is 2.8224 MHz. The notion that you cannot find something fast enough is ridiculous.
http://www.philipslogic.com/products/shiftregisters/
http://parametric.fairchildsemi.com/...StepSearch=yes
http://focus.ti.com/docs/logic/catal...n=product_list
http://www.onsemi.com/site/products/...mnID=0&action=

Thanks for the reply, the links are very helpful. It was more the propagation delay (after 18 stages) than the clock rate that was a problem. I dont want to delay the clock pulses half the time to compensate for the propagation. I guess the notion of finding an 18 stage static shift register with a total propagation delay comfortably under 30ns might be "radiculous", but my search skills suck
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Old 29th December 2003, 12:06 AM   #6
avian is offline avian  Australia
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The links provided have been extremely helpful. Looks like a 74hc676 16bit shift register together with a 74hc194 4bit shift register will do the trick and be more than quick enough.

cheers!
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