[time-nuts] Re: Will a TADD-2 work with 50 MHz input?

[Bob Camp]

Hi

Even with an ice cube …. not so much.

You don’t just want it to divide. You want it to divide and be reasonably low noise. 

Likely cheapest alternative would be some sort of add on board done at JLPCB.
(so no, not off the shelf ….).

Bob

> On Sep 25, 2024, at 9:30 PM, John Ackermann N8UR via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi Jim --
> 
> The PICs used in the TADD-2 and TADD-2 Mini are rated for a maximum external clock of 20 MHz.  So, 50 MHz probably won't work, unless maybe you set an ice cube on top of the IC. :-)
> 
> John
> ----
> 
> On 9/25/24 20:51, Jim Lux via time-nuts wrote:
>> 	
>> I have a 50 MHz oscillator I want to measure, and I have a TICC and a 10 MHz source (to run the TICC) and a good 1pps.  I assume that if I divide the 50 down to 5 (e.g. with the TADD-2) I can do the measurement.  The question is whether the TADD (or some other inexpensive off the shelf thing) can handle that high an input frequency.
>> Or, is that pushing the PIC beyond its limits?
>> Same sort of question for 100 MHz.
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