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CX3SM データシート(PDF) 2 Page - STATEK CORPORATION |
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CX3SM データシート(HTML) 2 Page - STATEK CORPORATION |
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2 / 2 page  STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com 10123 - Rev C SPECIFICATIONS Specifications are typical at 25OC unless otherwise noted. Specifications are subject to change without notice. Frequency Range 800 kHz - 1.35 MHz Functional Mode Extensional Calibration Tolerance1 500 ppm (0.05%) 1000 ppm (0.1%) 10000 ppm (1.0%) Load Capacitance 7 pF Motional Resistance (R1) 5 kΩ MAX Motional Capacitance (C1) 1.2 fF Quality Factor (Q) 150 k Shunt Capacitance (C0) 1.0 pF Drive Level 3 µW MAX. Turning Point (T0)2 35OC Temperature Coefficient (k) -0.035 ppm/OC2 Note: Frequency f at temperature T is related to frequency f0 at turning point temperature T0 by: Aging, first year 5 ppm MAX Shock, survival 1000 g, 0.3 ms,1/2 sine Vibration, survival 10 g RMS, 20-1,000 Hz random Operating Temp. Range -10OC to +70OC (Commercial) -40OC to +85OC (Industrial) -55OC to +125OC (Military) Storage Temp. Range -55OC to +125OC Max Process Temperature 260OC for 20 sec. 1. Tighter tolerances available. 2. Other values available. + _ + _ + _ f-f0 = k(T-T 0) 2 f0 HOW TO ORDER CX3SM CRYSTALS CX3 S C SM1 1.0M , 500 / I TERMINATIONS Designation Termination SM1 Gold Plated SM2 Solder Plated SM3 Solder Dipped SM4 Solder Plated (Lead Free) SM5 Solder Dipped (Lead Free) PACKAGING OPTIONS CX3SM - Tray Pack - Tape and Reel (Reference tape and reel data sheet 10109) 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 below. 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 150 ppm 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 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 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 (f0) is approximately equal to: AMPLIFIER BUFFER CG CD RA CX3 XTAL OSC Freq (f ) O Rf CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT f0 = fS [1+ C1 ] 2(C0 + CL) (2) Where f S = Series resonant frequency of the crystal C1 = Motional Capacitance C0 = Shunt Capacitance CL = CD x CG + CS CD + CG (1) “S” if special or custom design. Blank if Std. Blank = Glass Lid C = Ceramic Lid SM1 = Gold Plated SM2 = Solder Plated SM3 = Solder Dipped SM4 = Solder Plated (Lead Free) SM5 = Solder Dipped (Lead Free) Frequency K = kHz M = MHz Calibration Tolerance @ 25OC (in ppm) Operating Temp. Range: C = -10OC to +70OC I = -40OC to +85OC M = -55OC to +125OC S = Customer Specified |
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