CXB1585N Просмотр технического описания (PDF) - Sony Semiconductor

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производитель

CXB1585N

Fibre Channel Repeater

Sony Semiconductor 

CXB1585N

Notes on Operation

1. Clock synthesizer (PLL)

The CXB1585N has a PLL-based clock recovery circuit for recovering the clock from the serial data. This clock

recovery circuit requires an external loop filter and an external resistor which determines the VCO center

frequency. The external part circuit and recommended constant values are shown in the figure below. The

parasitic capacitance attached to the IC pins (Pins 12, 13 and 14) which are used to connect external parts

should be kept as small as possible in order to obtain the good PLL characteristics. In addition, capacitor C1

should have a small temperature coefficient to reduce the temperature dependence of the VCO oscillation

frequency.

11 VEEP

12 REXT

R1

CXB1585N

LPFPOS 14

C1

LPFNEG 13

R1: 4.7kΩ

C1: 0.01µF

Fig. 1. External Part Circuit and Recommended Constants

–9–

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