ICS8442 datasheet(9/15 Pages) ICST

9 / 15 page

8442AY

www.icst.com/products/hiperclocks.html

REV. C JULY 8, 2004

Integrated

Circuit

Systems, Inc.

ICS8442

700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL

LVDS FREQUENCY SYNTHESIZER

CRYSTAL INPUT INTERFACE

A crystal can be characterized for either series or parallel mode

operation. The ICS8442 has a built-in crystal oscillator circuit.

This interface can accept either a series or parallel crystal without

additional components and generate frequencies with accuracy

Figure 3. CRYSTAL INPUt INTERFACE

22p

18p

18pF Parallel Crystal

ICS8442

XTAL2

XTAL1

suitable for most applications. Additional accuracy can be

achieved by adding two small capacitors C1 and C2 as shown in

Figure 3. Typical results using parallel 18pF crystals are shown

in Table 10.

LVDS DRIVER TERMINATION

A general LVDS interface is shown in

Figure 4. In a 100

Ω differ-

ential transmission line environment, LVDS drivers require a

matched load termination of 100

Ω across near the receiver in-

put. For a multiple LVDS outputs buffer, if only partial outputs

are used, it is recommended to terminate the un-used outputs.

100

Ω

Ω Differential Transmission Line

3.3V

LVDS_DRIVER

100

HiPerClockS

Zo = 50 Ohm

nCLK

CLK

FIGURE 4. TYPICAL LVDS DRIVER TERMINATION

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