[time-nuts] Aging 5065A ?

[Bob kb8tq]

Hi

If you look at the standard chips that do this, they expand the accumulator. 
The D/A is limited to the “normal” number of bits based on the max clock
frequency. ( = no free lunch …).

Bob

> On Oct 7, 2020, at 5:37 PM, Mike Feher <mfeher at eozinc.com> wrote:
> 
> So, you are increasing the length of the accumulator. What about the D/A then? 73 - Mike 
> 
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell NJ 07731
> 848-245-9115
> 
> -----Original Message-----
> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Bob kb8tq
> Sent: Wednesday, October 7, 2020 1:55 PM
> To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Aging 5065A ?
> 
> Hi
> 
> The “normal” 32 bit DDS chips only get you just so far in terms of tuning resolution.
> If you want to run a fixed / well regulated C Field, a DDS with (say) 48 bits would allow you to tune the device well past  parts in 10^-15. There are several DDS chips out there that will do this. Some of the more common ones ( = what you see on eBay) have issues ….
> 
> Bob
> 
>> On Oct 7, 2020, at 12:11 PM, Mike Feher <mfeher at eozinc.com> wrote:
>> 
>> Just curious Bob. What do you mean by higher resolution? Would that be 
>> a longer accumulator and more bits in the D/A? 73 - Mike
>> 
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell NJ 07731
>> 848-245-9115
>> 
>> -----Original Message-----
>> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Bob 
>> kb8tq
>> Sent: Wednesday, October 7, 2020 11:11 AM
>> To: Discussion of precise time and frequency measurement 
>> <time-nuts at lists.febo.com>
>> Subject: Re: [time-nuts] Aging 5065A ?
>> 
>> Hi
>> 
>> Yup, Bert has lashed up at least one that way ( I have it here in the basement).
>> I am working on a board with a higher resolution DDS than the typical eBay parts.
>> 
>> Bob
>> 
>> ions there.
>> 
>> 
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> 
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