CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
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PRELIMINARY
Integrated Circuit Systems, Inc.
ICS844008I-15
FEMTOCLOCKS™ CRYSTAL-TOLVDS FREQUENCY...
Description
www.DataSheet4U.com
PRELIMINARY
Integrated Circuit Systems, Inc.
ICS844008I-15
FEMTOCLOCKS™ CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER
FEATURES
Eight LVDS outputs Crystal oscillator interface Supports the following output frequencies: 100MHz or 125MHz VCO: 500MHz RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.42ps (typical) Full 3.3V supply modes -40°C to 85°C ambient operating temperature Available in both standard and lead-free RoHS compliant packages
GENERAL DESCRIPTION
The ICS844008I-15 is an 8 output LVDS Synthesizer optimized to generate PCI Express HiPerClockS™ reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. Using a 25MHz parallel resonant crystal, the following frequencies can be generated based on F_SEL pin: 100MHz or 125MHz. The ICS844008I-15 uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting PCI Express jitter requirements. The ICS844008I-15 is packaged in a 32-pin LQFP package.
IC S
FREQUENCY SELECT FUNCTION TABLE
Input Input Frequency (MHz) 25MHz 25MHz M Divider Value 20 20 N Divider Value 4 5 M/N Divider Value 5 4 Output Frequency (MHz) 12 5 100
PIN ASSIGNMENT
XTAL_OUT nPLL_SEL XTAL_IN V DDA GND OE1 OE2 VDD
F_SEL 0 1
32 31 30 29 28 27 26 25 Q0 nQ0 VDD Q1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
F_SEL Q3 nQ3 VDD GND Q4 nQ4 MR
24
Q7 nQ7 VDD Q6 nQ6 GND Q5 nQ5
ICS844008I-15
32-Lead LQFP ...
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