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CX1-EXT 数据表(PDF) 1 Page - IQD Frequency Products Ltd |
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CX1-EXT 数据表(HTML) 1 Page - IQD Frequency Products Ltd |
1 / 3 page CX1 EXT Quartz Crystal Specification ISSUE 1; January 2016 Outline (mm) -SM1 = Gold Plated (lead free) glass lid Conventional CMOS Pierce Oscillator Circuit Description The CX1 EXT surface-mount quartz crystal is hermetically sealed in a rugged ceramic package. This crystal is manufactured using a photolithographic process developed by Statek and has been designed utilising the experience acquired by producing millions of crystals for industrial, commercial, military and medical applications. -C SM1 Gold Plated (lead free) with ceramic lid -C SM4 Solder Plated (lead free) with ceramic lid -C SM5 Solder Dipped (lead free) with ceramic lid -SM1 Gold Plated (lead free) glass lid -SM4 Solder Plated (lead free) glass lid -SM5 Solder Dipped (lead free) glass lid FEATURES: Extensional mode Ideal for use with microprocessors Designed for low power applications Compatible with hybrid or PC board packaging Low ageing Full military testing available Ideal for battery operated applications TYPICAL APPLICATION FOR A PIERCE OSCILLATOR: The low profile CX miniature surface-mount crystal is ideal for small, high density, battery operated portable products. The CX crystal designed in a Pierce oscillator (single inverter) circuit provides very low current consumption and high stability. A conventional CMOS Pierce oscillator circuit is shown. The crystal is effectively inductive and in a PI-network circuit with CD and CG provides the additional phase shift necessary to sustain oscillation. The oscillation frequency (f0) is 15 to 250ppm above the crystal’s series resonant frequency (fS). Drive Level: RA is used to limit the crystal’s drive level by forming a voltage divider between RA and CD. RA also stabilizes the oscillator against changes in the amplifiers output resistance (R0). RA should be increased for higher voltage operation. Load Capacitance: The CX crystal frequency tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (CL). CL is approximately equal to: CL = ((CD X CG)/(CD + CG)) + CS Note: CD and CG include stray layout to ground and CS is the stray shunt capacitance between the crystal terminal. In practice, the effective value of CL will be less than that calculated from CD, CG and CS values because of the effect of the amplifier output resistance. CS should be minimised. The oscillation frequency (f0) is approximately equal to: f0 = fS [1+ ((C1/(2*(C0+CL))] Where fS = Series resonant frequency of the crystal C1 = Motional Capacitance C0 = Shunt Capacitance Please note that all data is only valid at 25°C unless otherwise stated. Printed on 25 Apr 16 12:01 using Model Data Sheet V1.2550 Page 1 of 3 Sales Office Contact Details: USA: +1.760.318.2824 France: 0800 901 383 UK: +44 (0)1460 270200 Germany: 0800 1808 443 Email: info@iqdfrequencyproducts.com Web: www.iqdfrequencyproducts.com |
类似零件编号 - CX1-EXT |
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类似说明 - CX1-EXT |
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