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CX3SM データシート(PDF) 2 Page - EUROQUARTZ limited |
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CX3SM データシート(HTML) 2 Page - EUROQUARTZ limited |
2 / 2 page EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk EURO QUARTZ CX3SM CRYSTAL Low Profile Miniature SMD Crystal 800kHz to 1.35MHz CRYSTAL EQUIVALENT CIRCUIT R1 Motional Resistance L1 Motional Inductance C1 Motional Capacitance C0 Shunt Capacitance TERMINATIONS - PLATING SM1 Gold Plated (Lead Free) SM2 Solder Plated SM3 Solder Dipped SM4 Solder Plated (Lead Free) SM5 Solder Dipped (Lead Free) Designation Termination TYPICAL APPLICATION FOR A PIERCE OSCILLATOR The low profile CX miniature crystal is ideal for use in 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 Pierce oscillator is shown above. The crystal is effectively inductive and in a Pi network circuit with CD and CG provides the additional phase shift to sustain oscillation. The oscillation frequency (fO) is 15 to 250ppm above the crystal's 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 amplifier's output resistance (RO). RA should be increased for higher voltage operation. Load Capacitance The CX crystal calibration tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (CL). CL is approximately equal to: Note: CD and CG include stray layout-induced capacitance 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 minimized. The oscillation frequency (fO) is approximately equal to: CL D G S C C C C C = x + D G + f O S 1 L = f + 2(CO + C ) C1 Where FS = Series resonant frequency of the crystal C1 = Motional Capacitance CO = Shunt Capacitance CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT |
同様の部品番号 - CX3SM |
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同様の説明 - CX3SM |
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