ICS44002AI01 datasheet(8/12 Pages) ICST

8 / 12 page

844002AGI-01

www.icst.com/products/hiperclocks.html

REV. A JANUARY 5, 2006

Integrated

Circuit

Systems, Inc.

ICS844002I-01

FEMTOCLOCKS™CRYSTAL-TO-

LVDS FREQUENCY SYNTHESIZER

INPUTS:

CRYSTAL INPUT:

For applications not requiring the use of the crystal oscillator

input, both XTAL_IN and XTAL_OUT can be left floating.

Though not required, but for additional protection, a 1k

resistor can be tied from XTAL_IN to ground.

REF_CLK INPUT:

For applications not requiring the use of the reference clock,

it can be left floating. Though not required, but for additional

protection, a 1k

Ω resistor can be tied from the REF_CLK to

ground.

LVCMOS CONTROL PINS:

All control pins have internal pull-ups or pull-downs; additional

resistance is not required but can be added for additional

protection. A 1k

Ω resistor can be used.

RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS

OUTPUTS

LVDS

All unused LVDS output pairs can be either left floating or

terminated with 100

Ω across. If they are left floating, we

recommend that there is no trace attached.

transmission line environment. For buffer with multiple LDVS

driver, it is recommended to terminate the unused outputs.

2.5V LVDS DRIVER TERMINATION

Figure 3 shows a typical termination for LVDS driver in

characteristic impedance of 100

Ω differential (50Ω single)

FIGURE 3. TYPICAL LVDS DRIVER TERMINATION

2.5V

100 Ohm Differential Transmission Line

2.5V

LVDS_Driv er

100

Ω Differential Transmission Line

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