PCK2023 데이터 시트보기 (PDF) - Philips Electronics

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PCK2023

CK408 (66/100/133/200 MHz) spread spectrum differential system clock generator

Philips Electronics 

Philips Semiconductors

CK408 (66/100/133/200 MHz) spread

spectrum differential system clock generator

Product data

PCK2023

Functional connection

Figure 13 shows a partial diagram of the PCK2023 in an application.

The host outputs are differential current drivers, therefore the output

current is converted to a voltage by using some type of load resistor

(in this case, RS and RP). The output current is based on two, the

value of Rref and the setting on MULTSEL0 and MULTSEL1 pins.

The Iref pin is actually a reference voltage which is fixed at 1.1 volts,

therefore, Iref is 1.1/Rref. There are limitations on how large the

current can be made. This is coupled to the termination resistors

used. The maximum voltage which should be observed at the HOST

or HOST pins of the PCK2023 is 1.1 volts. This value may be

determined by using:

Vmax

+

(Rs

)

RP)Nmult

1.1

Rref

where RS and RP are the termination resistor values, Nmult is the

current multiplier set by MULTSEL0 and MULTSEL1, and Rref is the

current reference resistor. Vmax should not exceed 1.1 volts

because of the internal current source configuration.

HCLK

HCLKB

RS

RS

RP

RP

HI

HI

LOAD

Iref

Rref

PCK2023

Figure 13. PCK2023 implementation in a circuit board

SW00859

2001 Sep 07

23

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