EURO QUARTZ CX-1-03 CRYSTAL Miniature Crystal 530kHz to 2.1MHz FEATURES Extensional Mode Ideal for use with microprocesors Designed for low power applications Full military testing available Low ageing OUTLINE & DIMENSIONS DESCRIPTION CX-1-03 crystals are high quality extensional mode crystals, hermetically sealed in a rugged, ceramic package. SPECIFICATION Specifications stated are typical at 25°C unless otherwise indicated. Specifications may change without notice. Frequency Range: Functional Mode: Calibration Tolerance*: 530kHz to 2.1MHz Extensional A = ±500ppm (0.05%) B = ±1000ppm (0.1%) C = ±10000ppm (1.0%) 7pF 3kΩ maximum 1.2fF 150k 3.0µW max. 35°C -0.035ppm/°C2 Load Capacitance: Motional Resistance: Motional Capacitance: Quality Factor: Drive Level: Turning Point (T0)**: Temperature Coefficient (k): PACKAGING CX-1-03 crystals are Tray Packed as standard. Note: Frequency f at temperature T is related to frequency F0 at turning point temperature To by: f-fo =k(T-To)2 fo Ageing, first year: 5ppm max. Shock, survival: 750g peak, 0.3ms, ½ sine Vibration, survival: 10g rms, 20~1000Hz 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: See package handling notes. * ** Tighter tolerances are available. Other values are available PACKAGE HANDLING The CX crystal is hermetically sealed in a ceramic package. Normal handling and soldering precautions for small, low thermal mass parts are adequate when installing or testing CX crystals. CX crystals may be wave soldered with proper precaution taken to avoid desoldering the leads. A slow machine rate or too high a pre-heat temperature or solder bath temperature may damage the crystals. Lead to package solder interface temperature should not exceed 175°C, glass lid to package seal rim temperature should not exceed 210°C. If the seal rim reaches temperatures above the maximum specified, the package may lose its hermeticity. Loss of hermeticity results in a frequency decrease and motional resistance increase. HOW TO ORDER CX-1-03 CRYSTALS CX-1 - S - 'S' if special, custom design. Otherwise leave blank C Blank = glass lid C = ceramic lid -03 Side Leads - 1.0M, Frequency K = kHz M = MHz A Calibration Tolerance @25°C A B C / 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 CX-1-03 CRYSTAL Miniature Crystal 530kHz to 2.1MHz CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT CRYSTAL EQUIVALENT CIRCUIT R1 Motional Resistance C1 Motional Capacitance L1 Motional Inductance C0 Shunt Capacitance 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: fO = fS 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