CX4VSM_11 STATEK | Alldatasheet
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STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com 10103 - Rev E
DESCRIPTION
STATEK’s ultra-miniature CX4VSM quartz crystals are hermetically sealed in surface mount ceramic packages and custom laser-tuned to frequencies ranging from 30 kHz to 250 kHz. This high quality tuning fork resonator is intended for use in Pierce (single inverter) oscillators with a maximum process temperature not to exceed 260OC.
FEATURES
Ultra-miniature, surface mount design Available with glass or ceramic lid Hermetically sealed ceramic package Quartz crystal tuning fork design High shock and vibration survival Excellent aging characteristics Designed for low power applications Full military testing available Designed and manufactured in the USA
APPLICATIONS
Medical Implantable and Non-Implantable Devices Military Devices Smart Card Transponder / Animal Migration Space Limited Devices Handheld Battery Operated Devices Down Hole / Industrial Instrumentation Computer / Computer Peripherals CX4VSM CRYSTAL 30 kHz to 250 kHz Ultra-Miniature Low Profile Surface Mount Quartz Crystal A B F D D TOP BOTTOM C E TYP. MAX. DIM inches mm inches mm A 0.197 5.00 0.210 5.33 B 0.072 1.83 0.085 2.16 C - - see below D 0.036 0.91 0.046 1.16 E 0.020 0.51 - - F 0.025 0.64 - - PACKAGE DIMENSIONS SUGGESTED LAND PATTERN C1 R1 21 L1 EQUIVALENT CIRCUIT R1 Motional Resistance L1 Motional Inductance C1 Motional Capacitance C0 Shunt Capacitance 0.059 (1.5) 0.160 (4.0) 0.092 (2.3) inches (mm) Glass Lid Shown THICKNESS (DIM C) Lid Termination Maximum inches mm SM1 0.050 1.27 SM2/SM4 0.051 1.30 SM3/SM5 0.053 1.35 SM1 0.045 1.14 SM2/SM4 0.046 1.17 SM3/SM5 0.048 1.22 CeramicGlass
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com 10103 - Rev E TERMINATIONS Designation Termination SM1 Gold Plated SM2 Solder Plated SM3 Solder Dipped SM4 Solder Plated (Pb Free) SM5 Solder Dipped (Pb Free) PACKAGING OPTIONS CX4VSM - Tray Pack - 16mm tape, 7” or 13” reels (Reference tape and reel data sheet 10109) SPECIFICATIONS Specifications are typical at 25OC unless otherwise noted. Specifications are subject to change without notice. Parameters Fundamental Overtone Frequency, (kHz) 32.768 100 200 Motional Resistance R1(kΩ) 50 18 2.4 Motional Capacitance C1 (fF) 2.3 1.07 2.2 Quality Factor Q (k) 40 85 140 Shunt Capacitance C0 (pF) 1.1 0.7 1.2 Load Capacitance (pF)1 9 8 5 Turning Point (oC)1 25 10 29 Standard Calibration Tolerance for 32.768 kHz2 Glass Lid: 30 ppm 100 ppm 1000 ppm Ceramic Lid: 100 ppm 1000 ppm 10000 ppm Drive Level 0.5 µW MAX 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 3 ppm Shock, survival 5,000 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. Other values available 2. Tighter tolerances available 3. Higher shock available +_+_+_ +_+_+_ f-f0 = k(T-T0) HOW TO ORDER CX4VSM CRYSTALS CX4V S C SM1 32.768K , 100 / I C = Ceramic Lid Blank = Glass Lid “S” if special or custom design. Blank if standard SM1 = Gold Plated (Pb Free) SM2 = Solder Plated SM3 = Solder Dipped SM4 = Solder Plated (Pb Free) SM5 = Solder Dipped (Pb Free) Operating Temp. Range: C = -10OC to +70OC I = -40OC to +85OC M = -55OC to +125OC S = Customer Specified Frequency K = kHz Calibration Tolerance @25OC (in ppm) 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 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 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 fS = Series resonant frequency of the crystal C1 = Motional Capacitance C0 = Shunt Capacitance CL = CD x CG +CS CD + CG (1)