117 Tiny Phase/Frequency Detector

117 : Tiny Phase/Frequency Detector

How it works

This is one of the blocks of a phased locked loop. The inputs are a reference clock and feedback clock and the outputs are the phase difference on either up or /down pin.

How to test

If the phase of the feedback clock is leading the reference clock, the up signal should show the phase difference. If it’s lagging, the down signal will show the difference.


# Input Output
0 reference clock up
1 feedback clock (inverted) down
2 active-low reset none
3 none none
4 none none
5 none none
6 none none
7 none none