EURO QUARTZ CX4VSM CRYSTAL Ultra-Miniature SMD Crystal 30kHz to 250kHz FEATURES Frequency Range 30kHz to 250kHz High shock resistance Low ageing Designed for low power applications Full MIL testing available OUTLINE & DIMENSIONS 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. SPECIFICATION Specifications stated are typical at 25°C unless otherwise indicated. Specifications may change without notice. Parameters Fundamental Frequency (Hz): Overtone 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: Turning Point (°C)1: 9 8 5 25 10 29 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%) Drive Level: Temperature Coefficient (k): Ageing, first year: 0.5µW max. -0.035ppm/°C2 5ppm max. Dim. H Glass Lid Ceramic Lid SM1 SM2 SM3 SM4 SM5 1.14 1.17 1.22 1.17 1.22 1.27 1.30 1.35 1.30 1.35 Note: Frequency f at temperature T is related to frequency Fo at turning point temperature To by: f-fo =k(T-To)2 fo Shock, survival: Vibration, survival: Operating Temperature Range Commercial: Industrial: Military: Storage Temperature Range: Maximum Process Temperature: 1. 2. 5000g, 0.3ms, ½ sine 20g rms, 20~2000Hz random -10° to +70°C -40° to +85°C -55 to +125°C -55° to +125°C +260°C for 20 seconds Other values available Tighter tolerances 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). HOW TO ORDER CX4VSM CRYSTALS CX4V - S 'S' if special, custom design. Otherwise leave blank - C Blank = glass lid C = ceramic lid - SM1 - Terminations SM1 = Gold plated * SM2 = Solder plated SM3 = Solder dipped SM4 = Solder plated * SM5 = Solder dipped * * = Lead free 32.768K, Frequency K = kHz 100 Calibration Tolerance @25°C (in ppm) / I Temp. Range C = -10° ~ +70°C I = -40° ~ +85°C M = -55° ~ +125°C S = Customer specified EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk EURO QUARTZ CX4VSM CRYSTAL Ultra-Miniature SMD Crystal CRYSTAL EQUIVALENT CIRCUIT R1 Motional Resistance C1 Motional Capacitance L1 Motional Inductance C0 Shunt Capacitance CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT 30kHz to 250kHz 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 (RO). 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: CL = CD x CG CD + CG + CS 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: TERMINATIONS - PLATING Designation SM1 SM2 SM3 SM4 SM5 fO = fS Termination Gold Plated (Lead Free) Solder Plated Solder Dipped Solder Plated (Lead Free) Solder Dipped (Lead Free) 1+ C1 2(C O + C L ) Where FS = Series resonant frequency of the crystal C1 = Motional Capacitance CO = Shunt Capacitance EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk