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CX4 Folha de dados(PDF) 2 Page - STATEK CORPORATION |
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CX4 Folha de dados(HTML) 2 Page - STATEK CORPORATION |
2 / 2 page CX4 S C SM1 1.8432M , 500 / I HOW TO ORDER CX4 CRYSTALS TYPICAL APPLICATION FOR A PIERCE OSCILLATOR The CX4 family of surface mount crystals are ideal for small, high density, battery operated portable products. The CX4 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 50 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 CX4 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 CX4 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) STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com 10161 Rev B C = Ceramic Lid Blank = Glass Lid “S” if special or custom design. Blank if standard SM1 = Gold Plated SM2 = Solder Plated SM3 = Solder Dippe d SM4 = Solder Plated (Lead Free) SM5 = Solder Dipped (Lead Free) Operating Temp. Range: C = -10OC to +70OC I = -40OC to +85OC M = -55OC to +125OC S = Customer Specified Frequency K = kHz M = MHz Calibration Tolerance @25OC (in ppm) SPECIFICATIONS Specifications are typical at 25OC unless otherwise noted. Specifications are subject to change without notice. Parameters Fundamental Overtone Frequency, (Hz) 600 K 1.0 M 1.4 M 1.8432 M 2.4576 M Motional Resistance, R1 (Ω) 300 400 600 500 1000 Motional Resistance, R1 MAX 3KΩ Motional Capacitance, C1 (fF) 3.5 2.0 1.3 3.5 1.5 Quality Factor, Q (k) 250 200 150 80 45 Shunt Capacitance, C0 (pF) 1.0 0.8 0.7 1.0 0.8 Standard Calibration 500 ppm ( 0.05%) Tolerance1 1000 ppm ( 0.1%) 10000 ppm ( 1.0%) Drive Level 3 µW MAX Load Capacitance, CL2 7pF Turning Point, T02 35OC Temperature Coefficient, k -0.035 ppm/OC2 TYP Note: Frequency f at temperature T is related to frequency f0 at turning point temperature T0 by: Functional Mode Extensional Aging, first year 5ppm MAX Shock, survival 1500 g, 0.3 ms, 1/2 sine Vibration, survival 20 g RMS, 10-2,000 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 NOTE: All values subject to change without notice. + _ + _ + _ + _ + _ + _ f-f0 = k(T-T 0) 2 f0 PACKAGING OPTIONS CX4 - Tray Pack - Tape and Reel (Reference tape and reel data sheet 10109) TERMINATIONS Designation Termination SM1 Gold Plated SM2 Solder Plated SM3 Solder Dipped SM4 Solder Plated (Lead Free) SM5 Solder Dipped (Lead Free) |
Nº de peça semelhante - CX4_08 |
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Descrição semelhante - CX4_08 |
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