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844004AK-104T Datasheet(PDF) 1 Page - Integrated Device Technology |
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844004AK-104T Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 16 page  FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER ICS844004-104 IDT™ / ICS™ LVDS FREQUENCY SYNTHESIZER 1 ICS844004AK-104 REV. A SEPTEMBER 15, 2008 General Description The ICS844004-104 is a 4 output LVDS Synthesizer optimized to generate Fibre Channel reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from IDT. Using a 26.5625MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz. The ICS844004-104 uses IDT’s 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Fibre Channel jitter requirements. The ICS844004-104 is packaged in a 32-pin VFQFN package. Features • Four differential LVDS outputs • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input • Supports the following output frequencies: 212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz • VCO range: 560MHz - 680MHz • RMS phase jitter at 212.5MHz (637kHz – 10MHz), using a 26.5625MHz crystal: <1ps (typical) • Full 3.3V or 2.5V output supply modes • 0°C to 70°C ambient operating temperature • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages Table 1. Frequency Table HiPerClockS™ ICS Inputs Output Frequency (MHz) Input Frequency (MHz) F_SEL1 F_SEL0 M Divider Value N Divider Value M/N Divider Value 26.5625 0 0 24 3 8 212.5 (default) 26.5625 0 1 24 4 6 159.375 26.5625 1 0 24 6 4 106.25 26.5625 1 1 24 12 2 53.125 23.4375 0 0 24 3 8 187.5 (default) 1 1 0 1 0 Phase Detector VCO 637.5MHz (w/26.5625MHz Reference) M = 24 (fixed) F_SEL[1:0] 0 0 ÷3 0 1 ÷4 1 0 ÷6 1 1 ÷12 2 OSC F_SEL[1:0] nPLL_SEL nXTAL_SEL MR REF_CLK XTAL_IN XTAL_OUT Q0 nQ0 Q1 nQ1 Q2 nQ2 Q3 nQ3 Pulldown Pulldown Pulldown Pulldown Pulldown 26.5625MHz 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 Q0 nQ0 MR nPLL_SEL nc nc nc nc Q3 nQ3 GND nc nc nXTAL_SEL REF_CLK GND Block Diagram Pin Assignment ICS844004-104 32 Lead VFQFN 5mm x 5mm x 0.925mm package body K Package Top View |
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