CX4VSM EUROQUARTZ | Alldatasheet
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Technical content
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE EURO QUARTZ
DESCRIPTION
CX3VSM crystals are leadless devices designed for surface mounting on PCBs or hybrid substrates. The crystals are intended for use in Pierce (single inverter) oscillator circuits. OUTLINE & DIMENSIONS SPECIFICATION
FEATURES
Frequency Range 30kHz to 250kHz High shock resistance Low ageing Designed for low power applications Full MIL testing available PACKAGING OPTIONS CX4VSM crystals are available either tray packed (<250pcs) or tape and reel (>250 pieces). 16mm tape, 178mm or 330mm reels (EIA 418). CX4VSM CRYSTAL HOW TO ORDER CX4VSM CRYSTALS CX4V - S - C - SM1 - 32.768K, 100 / I 'S' if special, custom design. Otherwise leave blank Blank = glass lid C = ceramic lid Terminations SM1 = Gold plated * SM2 = Solder plated SM3 = Solder dipped SM4 = Solder plated * SM5 = Solder dipped * * = Lead free Frequency K = kHz Calibration Tolerance @25°C (in ppm) Temp. Range C = -10° ~ +70°C I = -40° ~ +85°C M = -55° ~ +125°C S = Customer specified 30kHz to 250kHz SM1 1.14 1.27 SM2 1.17 1.30 SM3 1.22 1.35 SM4 1.17 1.30 SM5 1.22 1.35 Glass Lid Ceramic LidDim. H Ultra-Miniature SMD Crystal Parameters Fundamental Overtone Frequency (Hz): 32.768 100 200 Motional Resistance R1 (kΩ): 50 18 2.4 Motional Capacitance C1 (fF): 2.3 1.07 2.2 QualityFactor Q (k): 40 85 140 Load Capacitance (pF)1: 9 8 5 Turning Point (°C)1: 25 10 29 Specifications stated are typical at 25°C unless otherwise indicated. Specifications may change without notice. 1. Other values available 2. Tighter tolerances available Drive Level: 0.5µW max. Temperature Coefficient (k): -0.035ppm/°C 2 Ageing, first year: 5ppm max. Note: Frequency f at temperature T is related to frequency Fo at turning point temperature To by: f-fo fo =k(T-To)2 Shock, survival: 5000g, 0.3ms, ½ sine Vibration, survival: 20g rms, 20~2000Hz random Operating Temperature Range Commercial: -10° to +70°C Industrial: -40° to +85°C Military: -55 to +125°C Storage Temperature Range: -55° to +125°C Maximum Process Temperature: +260°C for 20 seconds Standard Calibration Tolerance for 32.768kHz (2) Glass Lid: ±30ppm (0.003%) ±100ppm (0.01%) ±1000ppm (0.1%) Ceramic Lid: ±100ppm (0.01%) ±1000ppm (0.1%) ±10000ppm (1.0%)
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE EURO QUARTZ 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 (R O). 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 (C L). 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 fO S 1 L = f + 2(CO +C ) Where F S = Series resonant frequency of the crystal C 1 = Motional Capacitance C O = Shunt Capacitance CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT CX4VSM CRYSTAL Ultra-Miniature SMD Crystal 30kHz to 250kHz