[time-nuts] Microchip PIC CTMU

[Bob Camp]

Hi

I have not dug into them for several years. Back when I did, you were pushing 
their limits as a couple of nanoseconds without getting into things like lots of 
averaging. 

Bob

> On May 10, 2016, at 8:29 PM, David <davidwhess at gmail.com> wrote:
> 
> I ran a search through the time-nuts archives and found only one
> mention of this a couple years ago asking the same question which is,
> has anybody explored the capabilities of the Microchip PIC CTMU for
> use as a time to digital converter or programmable delay?
> 
> The Microchip datasheets lack detailed performance specifications but
> my conservative estimate is that resolution down to 500ps over 200ns
> using the built in 10 bit ADC should be possible without complex
> calibration.  (The PIC series ADCs with more than 10 bits are pretty
> horrible.)
> 
> See What You Can Do with the CTMU:
> http://ww1.microchip.com/downloads/en/AppNotes/CTMU%2001375a.pdf
> 
> Overview of Charge Time Measurement Unit (CTMU):
> http://www.microchip.com/stellent/groups/SiteComm_sg/documents/DeviceDoc/en542792.pdf
> 
> PIC18(L)F2X/4XK22 w/10 Bit ADC:
> http://ww1.microchip.com/downloads/en/DeviceDoc/39977f.pdf
> 
> PIC18F66K80 w/12 Bit ADC:
> http://ww1.microchip.com/downloads/en/DeviceDoc/39977f.pdf
> 
> I prefer more discrete implementations but this might be useful for
> its higher integration, lower cost, and simplicity in less demanding
> applications.
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