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Discussion Groups | Analog Devices DSPs | Suitable clock oscillators for ADSP-21065L
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
Suitable clock oscillators for ADSP-21065L - jcarlosmor - Apr 22 14:44:00 2005
I am designing with the ADSP-21065L but the 3 ns rise and fall times
requirements for the CLKIN seem very hard to obtain from vendors.
Digi-
Key, Newark and some others only sell clock oscillators with longer
rise and fall time. I suppose that those requirements are not
necessary
if I use instead a cristal with capacitors and let the DSP to run its
internal oscillator rather than to use an external clock. Am I right?
Thank you very much for your help.
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Re: Suitable clock oscillators for ADSP-21065L - Steve Holle - Apr 22 16:05:00 2005
You could buffer the clock with a clock driver also. Of course, if
you use a crystal that meets the ADI specs, the internally generated
clock will meet specs.
At 12:44 PM 4/22/2005, jcarlosmor wrote:
>I am designing with the ADSP-21065L but the 3 ns rise and fall times
>requirements for the CLKIN seem very hard to obtain from vendors.
>Digi-
>Key, Newark and some others only sell clock oscillators with longer
>rise and fall time. I suppose that those requirements are not
>necessary
>if I use instead a cristal with capacitors and let the DSP to run its
>internal oscillator rather than to use an external clock. Am I right?
>
>Thank you very much for your help. Steve Holle
Link Communications, Inc.
1035 Cerise Rd.
Billings, MT 59101
sholle@shol...
(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )
you use a crystal that meets the ADI specs, the internally generated
clock will meet specs.
At 12:44 PM 4/22/2005, jcarlosmor wrote:
>I am designing with the ADSP-21065L but the 3 ns rise and fall times
>requirements for the CLKIN seem very hard to obtain from vendors.
>Digi-
>Key, Newark and some others only sell clock oscillators with longer
>rise and fall time. I suppose that those requirements are not
>necessary
>if I use instead a cristal with capacitors and let the DSP to run its
>internal oscillator rather than to use an external clock. Am I right?
>
>Thank you very much for your help. Steve Holle
Link Communications, Inc.
1035 Cerise Rd.
Billings, MT 59101
sholle@shol...
(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )