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MK2069-03GI Datasheet(PDF) 7 Page - Integrated Circuit Systems |
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MK2069-03GI Datasheet(HTML) 7 Page - Integrated Circuit Systems |
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7 / 19 page  VCXO-Based Clock Translator with High Multiplication MDS 2069-03 I 7 Revision 050203 Integrated Circuit Systems, Inc. l 525 Race Street, San Jose, CA 95126 l tel (408) 295-9800 l www.icst.com MK2069-03 CP establishes a second pole in the VCXO PLL loop filter. For higher damping factors (> 1), calculate the value of CP based on a CS value that would be used for a damping factor of 1. This will minimize baseband peaking and loop instability that can lead to output jitter. CP also dampens VCXO input voltage modulation by the charge pump correction pulses. A CP value that is too low will result in increased output phase noise at the phase detector frequency due to this. In extreme cases where input jitter is high, charge pump current is high, and CP is too small, the VCXO input voltage can hit the supply or ground rail resulting in non-linear loop response. The best way to set the value of CP is to use the filter response software available from ICS (please refer to the following section). CP should be increased in value until it just starts affecting the passband peak. Loop Filter Response Software Online tools to calculate loop filter response can be found at www.icst.com. Graph of Charge Pump Current vs. Value of RSET (external resistor) Charge Pump Current, Example Settings from Above Graph Notes on Setting Charge Pump Current The recommended range for the charge pump current is 25 µA to 300 µA. Below 25 µA, loop filter charge leakage, due to PCB or capacitor leakage, can become a problem. This loop filter leakage can cause locking problems, output clock cycle slips, or low frequency phase noise. As can be seen in the loop bandwidth and damping factor equations or by using the filter response software available from ICS, increasing charge pump current (ICP) increases both bandwidth and damping factor. 10E-6 100E-6 1E-3 100E+3 1E+6 10E+6 RSET, ohms Recommended Range of Operation RSET Charge Pump Current (ICP) 5 M Ω 25 µA 3 M Ω 42 µA 2 M Ω 65 µA 1 M Ω 125 µA 480 k Ω 255 µA 400 k Ω 300 µA |
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