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ICS844002AGI-01LFT Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS844002AGI-01LFT Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 12 page 844002AGI-01 www.icst.com/products/hiperclocks.html REV. A JANUARY 5, 2006 1 Integrated Circuit Systems, Inc. ICS844002I-01 FEMTOCLOCKS™CRYSTAL-TO- LVDS FREQUENCY SYNTHESIZER GENERAL DESCRIPTION The ICS844002I-01 is a 2 output LVDS Synthesizer optimized to generate Ethernet reference clock frequencies and is a mem- ber of the HiPerClocks TM family of high performance clock solutions from ICS. Using a 25MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 156.25MHz, 125MHz and 62.5MHz. The ICS844002I-01 uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Ethernet jitter requirements. The ICS844002I-01 is packaged in a small 20-pin TSSOP package. FEATURES • Two LVDS outputs • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input • Supports the following output frequencies: 156.25MHz, 125MHz, 62.5MHz • VCO range: 560MHz - 680MHz • RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.41ps (typical) • Full 2.5V supply mode • -40°C to 85°C ambient operating temperature • Available in both, standard and RoHS/Lead-Free compliant packages HiPerClockS™ ICS 1 1 0 1 0 Phase Detector VCO 625MHz (w/25MHz Reference) M = 25 (fixed) F_SEL[1:0] 0 0 ÷4 0 1 ÷5 1 0 ÷10 1 1 not used 2 OSC BLOCK DIAGRAM FREQUENCY SELECT FUNCTION TABLE F_SEL[1:0] nPLL_SEL REF_CLK XTAL_IN XTAL_OUT nXTAL_SEL MR Q0 nQ0 Q1 nQ1 Pulldown Pulldown 25MHz Pulldown Pulldown Pulldown ICS844002I-01 20-Lead TSSOP 6.5mm x 4.4mm x 0.92mm package body G Package Top View nc VDDO Q0 nQ0 MR nPLL_SEL nc VDDA F_SEL0 VDD 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDDO Q1 nQ1 GND VDD nXTAL_SEL REF_CLK XTAL_IN XTAL_OUT F_SEL1 PIN ASSIGNMENT ) z H M ( y c n e u q e r F t u p t u O ) e c n e r e f e R z H M 5 2 ( 1 L E S _ F0 L E S _ F r e d i v i D M e u l a V r e d i v i D N e u l a V 00 5 24 5 2 . 6 5 1 01 5 25 5 2 1 10 5 20 15 . 2 6 11 d e s U t o Nd e s U t o N |
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