[time-nuts] Microchip PIC CTMU

[Bob Camp]

Hi

Given that a “real” TDC is a resistor and capacitor attached to a FPGA pin (plus the ADC)
the cost of doing it better is not all that much. You can get down to a few hundred ps without
a lot of crazy effort ( still using the MCU ADC).  

Bob

> On May 13, 2016, at 3:51 AM, David <davidwhess at gmail.com> wrote:
> 
> It is always an extra challenge to get even datasheet performance out
> of sampling converters which are integrated with a microcontroller and
> of course Microchip says nothing about noise or complete AC
> performance.
> 
> I suspect adding an external ADC to the Microchip CTMU while possible
> would be a waste of effort.  If you are going to do that, then you
> might as well design in a real time to voltage converter.
> 
> On Wed, 11 May 2016 07:27:14 -0400, you wrote:
> 
>> Hi
>> 
>> The same process issues that make for a “less than perfect” ADC, also 
>> add more than a little noise into the circuit. Exactly which component(s)
>> are the biggest culprits 
> no idea. About all you can do is take data and
>> look at the results. 
>> 
>> Bob
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