CXB1581Q Просмотр технического описания (PDF) - Sony Semiconductor

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производитель

CXB1581Q

Fibre Channel Transmitter

Sony Semiconductor 

CXB1581Q

Notes on Operation

1. Clock synthesizer (PLL)

The CXB1581Q has a built-in PLL-based clock synthesizer for generating the serial data transmission

frequency clock (transmission bit clock) from TBC_IN. This clock synthesizer 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 55, 59 and 60) 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.

55 56 57 58 59 60

R3

R1

R2

C1

R1: 1.5kΩ

R2: 1.5kΩ

R3: 4.7kΩ

C1: 0.01µF

Fig. 1. External Part Circuit and Recommended Constants

– 17 –

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