EURO QUARTZ CX2SM CRYSTAL Low Profile Miniature SMD Crystal 760kHz to 1.35MHz FEATURES Extensional mode resonator, 760kHz to 1.35MHz Designed for low power applications Ideal microprocessor clock crystal Low ageing Full military testing available DESCRIPTION OUTLINE & DIMENSIONS CX2SM crystals consist of a high quality extensional mode resonator in a rugged, hermetically sealed ceramic package. Dim. A B C D E F G H I SPECIFICATION Specifications stated are typical at 25°C unless otherwise indicated. Specifications may change without notice. Frequency Range: 760.0kHz to 1.35MHz Standard Calibration Tolerance*: ±500ppm (0.05%) ±1000ppm (0.1%) ±10000ppm (1.0%) Load Capacitance: 7pF Motional Resistance (R1): 5kΩ maximum Motional Capacitance (C1): 1.2fF Quality Factor (Q): 150k Shunt Capacitance (C0): 1.0pF Drive Level: 3µW maximum Turning Point (T0**): 35°C Temperature Coefficient (k): -0.035ppm/°C2 Ageing First Year: ±5ppm maximum Shock, Survival: 1000g, 0.3ms, ½ sine Vibration, Survival: 10g rms, 20~1000Hz random Operating Temperature Range: -10°C to +70°C (Commercial) -40°C to +85°C (Industrial) -55°C to +125°C (Military) Storage Temperature Range: -55° to +125°C Maximum Process Temperature: +260°C for 20 seconds * ** Typ. Max. 6.60 6.99 2.39 2.74 see below 0.89 1.14 1.50 1.75 1.27 1.52 2.67 2.92 3.94 4.19 5.33 5.59 Dim. C Glass Lid Ceramic Lid SM1 SM2 SM3 SM4 SM5 1.65 1.70 1.78 1.70 1.78 1.91 1.96 2.03 1.96 2.03 PACKAGING OPTIONS CX2SM crystals are available either tray packed (<250pcs) or tape and reel (>250 pieces). 16mm tape, 178mm or 330mm reels (EIA 418). Tighter frequency calibration is available. Other turning point is available. Turning Point Temperature Note: Frequency f at temperature T is related to frequency Fo at turning point temperature To by: f-fo =k(T-To)2 fo HOW TO ORDER CX2SM CRYSTALS CX2 - 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 1.0M Frequency K = kHz M = MHz , 500 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 CX2SM CRYSTAL Low Profile Miniature SMD Crystal CRYSTAL EQUIVALENT CIRCUIT R1 Motional Resistance C1 Motional Capacitance L1 Motional Inductance C0 Shunt Capacitance 760kHz to 1.35MHz 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 Turning Point Temperature Note: Frequency f at temperature T is related to frequency F0 at turning point temperature To by: f-fo =k(T-To)2 fo 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