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The FPD and FREF signals to the phase detector are available on pins 24 and 25 and may be used to monitor the frequency input to the phase detector or used in conjunction with an external phase detector. The outputs are disabled by taking pin 22 low. When the FPD and FREF outputs are to be used at high.frenqnuercies, an external pull down resistor of minimum value 330 1 may be connected to ground to reduce the fall time of the output pulse. The charge pump connections to theloop amplifier consist of the charge pump output and the charge pump reference. The matching of the charge pump up and down currents will only be maintained if the charge pump output is held at a voltage equal to the charge pump reference using an operational amplifierto produce a virtual earth condition at pin 20. The lock detect circuit can drive an LED to give visual indication of phase lock or provide an indication to the control system if a pullup resistoris used in place of the LED. A small capacitor connected form the C-LOCK DETECTOR pin to ground may be used to delay lock detect indication and remove glitches produced by momentary phase coincidence during lock up.
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