ICS84330CI datasheet(8/20 Pages) IDT

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ICS84330CVI REVISION A JANUARY 7, 2011

ICS84330CI Data Sheet

720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER

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 performance,

power supply isolation is required. The ICS84330CI provides

separate power supplies to isolate any high switching noise from the

outputs to the internal PLL. VCC and VCCA 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 10

 resistor along with a 10F bypass capacitor be

connected to the VCCA pin.

Figure 2. Power Supply Filtering

Recommendations for Unused Input and Output Pins

Inputs:

LVCMOS Control Pins

All control pins have internal pullups or pulldowns; additional

resistance is not required but can be added for additional protection.

A 1k

 resistor can be used.

Outputs:

TEST Output

The unused TEST output can be left floating. There should be no

trace attached.

LVPECL Outputs

The unused LVPECL output pair can be left floating. We recommend

that there is no trace attached. Both sides of the differential output

pair should either be left floating or terminated.

Figure 3. Cycle-to-Cycle Jitter vs. fOUT (using a 16MHz crystal)

VCC

VCCA

3.3V

10µF

.01µF

200

300

600

700

400

500

Output Frequency (MHz)

N = 1

Spec Limit

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