CT20900 is a PLL providing 33, 66, 50 and 200MHz clocks based on a 25MHz reference clock. It comprises a Phase Frequency Detector with internal charge pump that detects the phase difference between the 25MHz reference clock and the divided by 8 version of the 200MHz clock generated by the Voltage Controlled Oscillator (VCO).

The loop includes a second order Low Pass Filter (LPF).


  • Fully Differential Topology
  • Charge Pump 3rd order configuration
  • 2nd order passive loop filter
  • Fin = 25MHz, Fout = 33, 50, 66 and 200MHz
  • Maximum Jitter < 50ps
  • Max current consumption = 2.3mA


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