I put the value of the loop filter into the ADISimPLL ver 3.30 and it seems that it is closer to 40KHz instead of the 20KHz in the board description document on the CD.
C1 = 1.5nF
R1 = 430 Ohm
C2 = 22nF
R2 = 820 Ohm
C3 = 680pF
The default figure for the Charge Pump Current in ADISimPLL is 5.0 mA. This is giving you the 40 kHz bandwidth.
In ADISimPLL, click Chip, then Phase Detector, then change the Charge Pump Current in CP Current.
This charge pump current relates to Charge Pump Current Setting in Register 2, DB12:DB9 on the chip.
at first thnk you for your attention
is there any relation between charge pump output current and loop filter ? explain that wich charge pump output should we set for 200kHz bandwidth
Thanks a lot
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