[time-nuts] Acam TDC's

Don Latham djl at montana.com
Sun Apr 6 01:16:44 EDT 2014


AliExpress has them, 5 piece lot for $70 shipping to US $4.21.   One claim I
saw said in quad mode 22 ps resolution. Hmmmm
Don

paul swed
> Angus
> Yes I did a fast check and couldn't find anyone in the US that seemed to
> carry it. The eval kit looks nice but will speculate its quite costly.
> That said I could see some uses for it like you say it has some things
> built in to eliminate false triggers and such. Just need to know if $1.59
> or $159 each.
> Cheap chips I may play with.
> Regards
> Paul.
>
>
> On Sat, Apr 5, 2014 at 8:03 PM, Angus <not.again at btinternet.com> wrote:
>
>> Hi,
>>
>> It's not exactly cutting edge resolution etc, but for a ready to go
>> chip, it's not at all bad. In theory, it looks like it should be
>> useful in a lot of the places that counters like a 53131/2 get used,
>> but it can sample very much faster than them. It also has useful
>> temperature inputs.
>>
>> Most of the projects I've come across don't stretch its performance so
>> I'm just interested if someone has really tested it.
>> If not, I expect I'll find out more when I get it up and running.
>>
>> Angus.
>>
>>
>> On Fri, 4 Apr 2014 18:27:05 -0400, you wrote:
>>
>> >Angus
>> >An interesting chip. I had never heard of it before and suspect this may
>> be
>> >the gizmo used in closed system water leak detection. Won't go into why I
>> >know about that.
>> >I did find comments from 2007 about the chip and atmega but nothing since.
>> >When I went looking for distributors or pricing to get an idea came up
>> >empty. Though Amazon will sell you lots of vitamins or something called
>> TDC.
>> >
>> >So with all that said I will guess that for time-nuts purposes the
>> >capabilities of this chip have been far exceeded by the various array
>> >technologies we have at very cheap prices today. The ability to create
>> long
>> >counters at very high speeds.
>> >Only a guess though.
>> >Regards
>> >Paul.
>> >WB8TSL
>> >
>> >
>> >On Fri, Apr 4, 2014 at 5:35 PM, Angus <not.again at btinternet.com> wrote:
>> >
>> >> Hi,
>> >>
>> >> With all the recent talk of interpolators, I started looking at the
>> >> acam TDC chips again - the GP22 is pretty cheap now for anyone who's
>> >> up for playing with the tiny QFN package.
>> >>
>> >> I was wondering if anyone here has tried them or properly evaluated
>> >> them as a TIC - especially the GP2/GP21/GP22.
>> >>
>> >> A few years back a some folk were talking about it, but I did not hear
>> >> much since that.
>> >>
>> >> Angus.
>> >> _______________________________________________
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-- 
"The power of accurate observation is commonly called cynicism by those who
have not got it."
 -George Bernard Shaw

Dr. Don Latham AJ7LL
Six Mile Systems LLC
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Huson, MT, 59846
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