813N252I-09_15 Datasheet, PDF (10/23 Pages) Integrated Device Technology – VCXO Jitter Attenuator & FemtoClock Multiplier

Parameter Measurement Information, continued
813N252I-09 Datasheet
VCXO & FemtoClock PLL Lock Time
Applications Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter perform ance,
power supply isolation is required. The 813N252I-09 provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. V_CC, V_CCA, V_CCO and V_CCX should be
individually connected to the power supply plane through vias, and
0.01µF bypass capacitors should be used for each pin. Figure 1
illustrates this for a generic V_CC pin and also shows that V_CCA
requires that an additional 10 resistor along with a 10F bypass
capacitor be connected to the V_CCA pin.
VCC
V_CCX
3.3V
.01µF
10Ω
10Ω
.01µF 10µF
V_CCA
.01µF 10µF
Figure 1. Power Supply Filtering
©2015 Integrated Device Technology, Inc.
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Revision C, December 10, 2015