8430AY-62LF datasheet(11/23 Pages) IDT

Part #	8430AY-62LF

Description	500MHz, Crystal-to-3.3V, 2.5V Differential LVPECL Frequency Synthesizer

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ICS8430-62 Datasheet

500MHz CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

ICS8430AY-62 REVISION A JULY 2, 2009

11

Parameter Measurement Information, continued

Output Rise/Fall Time

Application 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 performance,

power supply isolation is required. The ICS8430-62 provides

separate power supplies to isolate any high frequency switching

noise from the outputs to the internal PLL. VCC, VCCA and VCCO

should be individually connected to the power supply plane through

vias, and 0.01µF bypass capacitors should be used for each pin.

Figure 2 illustrates this for a generic VCC pin and also shows that

VCCA requires that an additional 10Ω resistor along with a 10µF

bypass capacitor be connected to the VCCA pin. The 10Ω resistor can

also be replaced by a ferrite bead.

Figure 2. Power Supply Filtering

20%

80%

20%

tR

t F

VSWING

nFOUTx

FOUTx

VCC

VCCA

3.3V

10

Ω

10µF

.01µF

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