Reference Frequency | Divider Value (N) | Remarks |
250 Hz | 310 | possible, integer value |
500 Hz | 155 | possible, integer value |
1 kHz | 77.5 | not possible |
2 kHz | 38.75 | not possible |
4 kHz | 19.375 | not possible |
The natural frequency (ωn) is a measure of the response time of the loop whilst the damping factor (ξ) is a measure of the overshoot and ringing.
Ideally, the natural frequency should be high ( 10% * REFCLK ) and the damping factor should be near 0.707 (critical damping).
The Schematics |
(1) The natural Frequency : ωn |
(2) The Damping Factor : ξ |
The Schematics |
(3) The natural Frequency : ωn |
(4) The Damping Factor : ξ |