PDF ICS843021 Data sheet ( Hoja de datos )

Número de pieza	ICS843021
Descripción	FEMTOCLOCKS CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
Fabricantes	Integrated Circuit Systems
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Hay una vista previa y un enlace de descarga de ICS843021 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas
No Preview Available ! Integrated Circuit Systems, Inc. ICS843021www.DataSheet4U.com FEMTOCLOCKS™CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR GENERAL DESCRIPTION ICS The ICS843021 is a Gigabit Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS843021 uses a 25MHz crystal to synthesize 125MHz.The ICS843021 has excellent phase jitter performance, over the 1.875MHz – 20MHz integration range. The ICS843021 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. FEATURES • 1 differential 3.3V LVPECL output • Crystal oscillator interface designed for 22.4MHz - 28MHz, 18pF parallel resonant crystal • Output frequency range: 112MHz - 140MHz • VCO range: 560MHz to 700MHz • Output duty cycle range: 49% - 51% • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.37ps (typical) • RMS phase noise at 125MHz (typical) Offset Noise Power 100Hz ............... -94.2 dBc/Hz 1KHz .............. -122.8 dBc/Hz 10KHz .............. -132.2 dBc/Hz 100KHz .............. -131.3 dBc/Hz • 3.3V operating supply • 0°C to 70°C ambient operating temperature • Industrial temperature information available upon request • Lead-Free package fully RoHS compliant FREQUENCY TABLE - TYPICAL APPLICATIONS Inputs Crystal Frequency (MHz) 25 26.6 Output Frequency (MHz) 125 133 BLOCK DIAGRAM XTAL_IN XTAL_OUT 25MHz OSC Phase Detector VCO ÷25 (fixed) ÷5 PIN ASSIGNMENT nQ0 Q0 VCCA VEE XTAL_OUT XTAL_IN 1 2 3 4 8 VCC 7 Q0 6 nQ0 5 nc ICS843021 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View 843021AG www.icst.com/products/hiperclocks.html 1 REV. C MARCH 31, 2005 1 page Integrated Circuit Systems, Inc. ICS843021www.DataSheet4U.com FEMTOCLOCKS™CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR PARAMETER MEASUREMENT INFORMATION 2V VCC LVPECL VEE -1.3V ± 0.33V SCOPE Qx nQx Phase Noise Plot Phase Noise Mask f1 Offset Frequency f2 RMS Jitter = Area Under the Masked Phase Noise Plot 3.3V OUTPUT LOAD AC TEST CIRCUIT RMS PHASE JITTER nQ0 Q0 Pulse Width t PERIOD odc = t PW t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD Clock 20% Outputs 80% tR 80% tF VSW I N G 20% OUTPUT RISE/FALL TIME 843021AG www.icst.com/products/hiperclocks.html 5 REV. C MARCH 31, 2005 5 Page Integrated Circuit Systems, Inc. PACKAGE OUTLINE - G SUFFIX FOR 8 LEAD TSSOP ICS843021www.DataSheet4U.com FEMTOCLOCKS™CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR 843021AG TABLE 8. PACKAGE DIMENSIONS SYMBOL Millimeters Minimum Maximum N8 A -- 1.20 A1 0.05 0.15 A2 0.80 1.05 b 0.19 0.30 c 0.09 0.20 D 2.90 3.10 E 6.40 BASIC E1 4.30 4.50 e 0.65 BASIC L 0.45 0.75 α 0° 8° aaa -- 0.10 Reference Document: JEDEC Publication 95, MO-153 www.icst.com/products/hiperclocks.html 11 REV. C MARCH 31, 2005 11 Page

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