ICS4320A01L datasheet(9/21 Pages) IDT

Part #	ICS4320A01L

Description	780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

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Manufacturer	IDT [Integrated Device Technology]

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84320AY-01

9

REV. C OCTOBER 22, 2007

ICS84320-01

780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL

LVPECL FREQUENCY SYNTHESIZER

APPLICATION INFORMATION

As in any high speed analog circuitry, the power supply pins

are vulnerable to random noise. The ICS84320-01 provides

separate power supplies to isolate any high switching

noise from the outputs to the internal PLL. V

CC, VCCA, and VCCO

should be individually connected to the power supply

plane through vias, and bypass capacitors should be

used for each pin. To achieve optimum jitter performance,

power supply isolation is required. Figure 2 illustrates how

a 24

Ω resistor along with a 10μF and a .01μF bypass

capacitor should be connected to each V

CCA pin. The 24Ω

resistor can also be replaced by a ferrite bead.

POWER SUPPLY FILTERING TECHNIQUES

FIGURE 2. POWER SUPPLY FILTERING

24

Ω

V

CCA

10

μF

.01

μF

3.3V

.01

μF

V

CC

INPUTS:

CRYSTAL INPUTS

For applications not requiring the use of the crystal oscillator

input, both XTAL_IN and XTAL_OUT can be left floating.

Though not required, but for additional protection, a 1k

Ω

resistor can be tied from XTAL_IN to ground.

TEST_CLK INPUT

For applications not requiring the use of the test clock, it can

be left floating. Though not required, but for additional

protection, a 1k

Ω resistor can be tied from the TEST_CLK to

ground.

LVCMOS CONTROL PINS

All control pins have internal pull-ups or pull-downs; additional

resistance is not required but can be added for additional

protection. A 1k

Ω resistor can be used.

RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS

OUTPUTS:

LVPECL OUTPUTS

All unused LVPECL outputs 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.

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