[time-nuts] Acam TDC's

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Apr 6 06:01:12 UTC 2014


GP21 eval kit about 300 Euro
GP21 about 10 Euro each

Bruce

paul swed wrote:
> 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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>>>>          
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