[time-nuts] On low-voltage TAC/TDCs for a GPSDO

J.D. Bakker jdb at lartmaker.nl
Fri Aug 13 12:12:12 UTC 2010


At 21:08 -0400 12-08-2010, Bob Paddock wrote:
>On Thu, Aug 12, 2010 at 6:45 PM, J.D. Bakker <jdb at lartmaker.nl> wrote:
>  > To start with the context: I'm planning to use a microcontroller with a
>  > built-in dual 12-bit 2MSPS ADC.
>
>That sounds like it is an Atmel XMega part.  Do make sure you read the data
>sheet errata section, as some parts in the XMega Ax line have nasty A/D
>problems.

Well spotted. I do know about the ... idiosyncrasies of some of the 
silicon revisions. I'm not yet dead-set on the XMega; the ADuC is 
still a contender too, but those come in harder-to-solder packages. I 
know the AVR line well from my day job, and its timer/counters with 
timestamping of external inputs are very handy for incoming PPS 
acquisition, PWM generation for the CV DAC and PPS synthesis. But 
nothing's set in stone yet.

Thanks,

JDB.
-- 
In protocol design, perfection has been reached not when there is 
nothing left to add, but when there is nothing left to take away.
                    -- RFC 1925, "Fundamental Truths of Networking"



More information about the time-nuts mailing list