EURO QUARTZ CX-2V CRYSTAL Miniature Crystal for Pierce Oscillators 16kHz to 600kHz FEATURES Frequency Range 16kHz to 600kHz High shock resistance Low ageing Designed for low power applications Full MIL testing available DESCRIPTION OUTLINE & DIMENSIONS CX-2V crystals are high quality tuning fork crystals intended for use in Pierce (single inverter) oscillator circuits. The crystal is hermetically sealed and rugged. SPECIFICATION Specifications stated are typical at 25°C unless otherwise indicated. Specifications may change without notice. Frequency Range: 16.0kHz to 600.0kHz Functional Mode: Tuning Fork (Flexure) Standard Calibration Tolerance*: A, B or C Motional Resistance (R1): Figure 1 Max = 16~24.9kHz, 2x typical 25~600kHz, 2.5x typical Motional Capacitance (C1): Figure 2 Quality Factor (Q): Figure 3 Min. is 0.25x typical Shunt Capacitance (C0): 2.0pF max. Drive Level 16~24.9kHz: 0.5µW max. 25~600.0kHz: 1.0µW max. Turning Point (T0)**: Figure 4 Temperature Coefficient (k): -0.035ppm/°C2 Ageing, first year: 5ppm max. Shock, survival***: 1,500g, 0.3ms, ½ sine Vibration, survival***: 10g rms, 20~2000Hz 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 note * Tighter frequency calibration is available. ** Other turning point is available *** Higher shock and vibration survival is available STANDARD CALIBRATION TOLERANCE PACKAGING Frequency Range (kHz) CX-2V leaded crystals are supplied in tray pack (Standard) 16 ~74.9 A B C 0.003% 0.01% 0.1% 75~169.9 0.005% 0.01% 0.1% 170~249.9 0.01% 0.02% 0.2% 250~600 0.02% 0.05% 0.5% HOW TO ORDER CX-2V CRYSTALS CX-2V - S - 02 - 32.768kHz, 'S' if special, custom design. Otherwise leave blank Leads 02 03 04 Frequency K = kHz 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-2V CRYSTAL Miniature Crystal for Pierce Oscillators 16kHz to 600kHz FIGURE 1 CX2V Typical Motional Resistance R1 LOAD CAPACITANCE (CL)* Frequency Range (kHz) 16~24.9 25~54.9 55~100.0 Load Capacitance 10pF 9pF 8pF Frequency Range (kHz) 100.0~179.9 180~600 Load Capacitance 5pF 4pF * The load capacitance we use to calibrate CX2VSM. (Other CL is available.) CRYSTAL EQUIVALENT CIRCUIT R1 Motional Resistance C1 Motional Capacitance L1 Motional Inductance C0 Shunt Capacitance FIGURE 2 CX2V Typical Motional Capacitance C1 CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT FIGURE 3 CX2V Typical Quality Factor (Q) 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. FIGURE 4 CX2V Typical Turning Point Temperature (To) 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