MPC93R51

REVISION 4 MARCH 14, 2016

8

©2013 Integrated Device Technology, Inc.

MPC93R51 Data Sheet

LOW VOLTAGE PLL CLOCK DRIVER

second level of isolation may be required. The simple but

effective form of isolation is a power supply filter on the VCCA

pin for the MPC93R51.

Figure 6 illustrates a typical power supply filter scheme.

The MPC93R51 frequency and phase stability is most

susceptible to noise with spectral content in the 100 kHz to 20

MHz range; therefore, the filter should be designed to target

this range. The key parameter that needs to be met in the

final filter design is the DC voltage drop across the series filter

resistor RF. From the data sheet, the ICCA current (the current

sourced through the VCCA pin) is typically 3 mA (5 mA

maximum), assuming that a minimum of 3.0 V must be

maintained on the VCCA pin. The resistor RF shown in

Figure 6 must have a resistance of 5-15

 to meet the

voltage drop criteria.