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CX1SM Fiches technique(PDF) 2 Page - RSG Electronic Components GmbH |
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CX1SM Fiches technique(HTML) 2 Page - RSG Electronic Components GmbH |
2 / 2 page RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de YS TEM C ERTIF IC A T 01 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 250 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 C G C D R A CX1 XTAL OSC Freq (f ) O R f 10129 - Rev B SPECIFICATIONS Specifications are typical at 25 OC unless otherwise noted. Specifications are subject to change without notice. Parameters Fundamental Overtone Frequency Range, (Hz) 555 k 614 k 1.0 M 1.4 M 1.8432 M 2.1M Motional Resistance,R1(Ω) 600 275 500 775 300 475 Motional Resistance,R1 MAX 3 k Ω Motional Capacitance,C1 (fF) 2.5 3.6 2.0 1.5 2.8 2.6 Quality Factor, Q (k) 170 260 190 100 110 70 Shunt Capacitance,C0 (pF) 1.2 1.3 1.1 1.0 1.3 1.3 Calibration Tolerance* 500 ppm (0.05%) 1000 ppm (0.1%) 10000 ppm (1.0%) Drive Level 3 µW MAX Load Capacitance** 7 pF Turning Point (T0)** 35 OC Temperature Coefficient (k) -0.035 ppm/ OC2 Note: Frequency f at temperature T is related to frequency f0 at turning point temperature T0 by: Function Mode Extensional Aging, first year 5 ppm MAX Shock, survival 750 g peak, 0.3 ms, 1/2 sine Vibration, survival 10 g RMS, 20-1,000 Hz random Operating Temp. Range -10 OC to +70OC (Commercial) -40 OC to +85OC (Industrial) -55 OC to +125OC (Military) Storage Temp. Range -55 OC to +125OC Max Process Temperature 260 OC for 20 sec. *Tighter tolerances available. ** Other values available. + _ + _ + _ HOW TO ORDER CX1SM CRYSTALS CX1 S C SM1 1.0M, 500 / M f-f0 = k(T-T0) 2 f0 TERMINATIONS Designation Termination SM1 Gold Plated SM2 Solder Plated SM3 Solder Dipped PACKAGING OPTIONS CX1SM - Tray Pack - Tape and Reel (Reference tape and reel data sheet 10109) CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT f0 = fS [1+ C 1 ] 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 Frequency K = kHz M = MHz Calibration Tolerance @ 25 OC (in ppm) Operating Temp. Range: C = -10 OC to +70OC I = -40 OC to +85OC M = -55 OC to +125OC S = Customer Specified |
Numéro de pièce similaire - CX1SM |
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Description similaire - CX1SM |
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