CXB1582Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXB1582Q

Fibre Channel Receiver

Sony Semiconductor 

CXB1582Q

Notes on Operation

1. Clock synthesizer (PLL)

The CXB1582Q has a built-in PLL-based clock recovery circuit which recovers 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 50, 53 and 54) which are used to connect external

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

R3 should have a small temperature coefficient to reduce the temperature dependence of the VCO oscillation

frequency.

50 51

R3

52 53

R1

54

R2

C1

R1: 200Ω

R2: 200Ω

R3: 4.7kΩ

C1: 0.01µF

Fig. 1. External Part Circuit and Recommended Constants

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