Datasheet > 84330BYT

84330BYT

更新时间： 2023-01-15 00:00:00

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
19页	247K
描述
Clock Generator, PQFP32

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84330BYT 数据手册

ICS84330

700MHZ, LOW JITTER, CRYSTAL-TO-3.3V

DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated

Circuit

Systems, Inc.

APPLICATION INFORMATION

POWER SUPPLY FILTERING TECHNIQUES

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

are vulnerable to random noise. The ICS84330 provides

separate power supplies to isolate any high switching

noise from the outputs to the internal PLL. V_CCand V_CCA

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

capacitor should be connected to each V_CCApin. The 10Ω

resistor can also be replaced by a ferrit bead.

3.3V

V_CC

.01μF

10Ω

V_CCA

10μF

FIGURE 2. POWER SUPPLY FILTERING

LVCMOS TO XTAL INTERFACE

The XTAL_IN input can accept single ended LVCMOS signal

acteristic impedance trace may be required. The input can

through an AC couple capacitor. A general interface diagram function with half swing amplitude. Reducing amplitude from

is shown in Figure 3. The XTAL_OUT input can be left full swing of 3.3V to half swing of about 1.65V can prevent

signal interfere with power rail and may reduce noise. Please

floating. The edge rate can be as slow as 10ns. If the incom-

ing signal has sharp edge rate and the signal path is a long refer to the LVCMOS driver data sheet and application note

trace, proper termination for the driver and controlled char- for amplitude reduction and termination approach.

3.3V

XTAL_I N

0.1uF

LVCMOS_Driver

XTAL_OU T

Cry stal Interface

Figure 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE

RECOMMENDATIONS FOR UNUSED INPUT PINS

INPUTS:

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 1kΩ resistor can be used.

84330BV

www.icst.com/products/hiperclocks.html

REV.C MAY 16, 2006

1...5 6 789 10 11...19

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