ICS844256D 데이터 시트보기 (PDF) - Integrated Device Technology

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ICS844256D

FemtoClock® Crystal-to-LVDS Frequency Synthesizer w/Integrated Fanout Buffer

Integrated Device Technology 

ICS844256D Data Sheet

FEMTOCLOCK® CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

Parameter Measurement Information, continued

VDD

DC Input LVDS

out

➤

out

VOS/∆ VOS

VDD

DC Input LVDS

out

➤

100

VOD/∆ VOD

out

Offset Voltage Setup

Differential Output Voltage Setup

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 ICS844256D provides

separate power supplies to isolate any high switching noise from the

outputs to the internal PLL. VDD, VDDA and VDDO 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 VDD pin and also shows that VDDA

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

capacitor be connected to the VDDA pin.

3.3V

VDD

.01µF 10Ω

VDDA

.01µF

10µF

Figure 1. Power Supply Filtering

ICS844256DG REVISION A AUGUST 5, 2010

9

©2010 Integrated Device Technology, Inc.

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