CX6SM EUROQUARTZ | Alldatasheet
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EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE EURO QUARTZ CX6SM CRYSTAL Low Profile Miniature SMD Crystal 800kHz to 1.35MHz
DESCRIPTION
CX6SM crystals consist of a high quality extensional mode resonator in a rugged, hermetically sealed ceramic package. Specifications stated are typical at 25°C unless otherwise indicated. Specifications may change without notice. Frequency Range: 800kHz 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/°C 2 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 SPECIFICATION
FEATURES
Extensional mode resonator, 760kHz to 1.35MHz Designed for low power applications Ideal microprocessor clock crystal Low ageing Full military testing available PACKAGING OPTIONS CX6SM 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. HOW TO ORDER CX6SM CRYSTALS CX6 - S - C - SM1 - 1.0M , 500 / 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 M = MHz Calibration Tolerance @25°C (in ppm) Temp. Range C = -10° ~ +70°C I = -40° ~ +85°C M = -55° ~ +125°C S = Customer specified Note: Frequency f at temperature T is related to frequency Fo at turning point temperature To by: f-fo fo =k(T-To)2 Turning Point Temperature OUTLINE & DIMENSIONS SM1 0.99 1.35 SM2 1.04 1.40 SM3 1.12 1.47 SM4 1.04 1.40 SM5 1.12 1.47 Glass Lid Ceramic LidDim. H
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE EURO QUARTZ CX6SM CRYSTAL Low Profile Miniature SMD Crystal 800kHz to 1.35MHz 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