Quartz Crystal Specification CX4 EXT ISSUE 1; January 2016 Description STATEK’s CX4 quartz crystals are hermetically sealed in an ultra-miniature low profile surface mount ceramic package. This high quality quartz resonator forms the basis of a stable oscillator. -C SM1 Gold Plated (lead free) ceramic lid -C SM4 Solder Plated (lead free) ceramic lid -C SM5 Solder Dipped (lead free) ceramic lid -SM1 Gold Plated (lead free) glass lid -SM4 Solder Plated (lead free) glass lid -SM5 Solder Dipped (lead free) glass lid The CX4 family of surface mount crystals are ideal for small, high density, battery operated portable products. The CX4 crystal designed in a Pierce oscillator (single inverter) circuit provides very low current consumption and high stability. A conventional CMOS Pierce oscillator circuit is shown below. The crystal is effectively inductive and in a PI network circuit with CD and CG provides the additional phase shift necessary to sustain oscillation. The oscillation frequency (f0) is 50 to 250 ppm above the crystal’s series 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 amplifiers output resistance (R0). RA should be increased for higher voltage operation. The CX4 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 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 (f0) is approximately equal to: Outline (mm) -SM1 = Gold Plated (lead free) glass lid Conventional CMOS Pierce Oscillator Circuit f0 = fS [1+ (C1 / (2(Co + CL))] Where fS = Series resonant frequency of the crystal C1 = Motional Capacitance Co = Shunt Capacitance Please note that all data is only valid at 25°C unless otherwise stated. Frequency Parameters 600.0kHz to 2.5MHz Frequency ±500.00ppm to ±10,000.00ppm Frequency Tolerance Tolerance Condition @ 25°C Ageing ±5ppm max in 1st year @ 25°C Turning Point To²: 35°C Temperature Coefficient: -0.035ppm/°C² typ Note: Frequency f at temperature T is related to frequency fo at turning point temperature To by: ((f-fo)/fo)= k(T-To)² Sales Office Contact Details: UK: +44 (0)1460 270200 France: 0800 901 383 Germany: 0800 1808 443 USA: +1.760.318.2824 Printed on 25 Apr 16 11:37 using Model Data Sheet V1.2550 Email: [email protected] Web: www.iqdfrequencyproducts.com Page 1 of 3 Quartz Crystal Specification CX4 EXT Electrical Parameters 7.0pF Load Capacitance (CL) 1pF typ Shunt Capacitance (C0) 3µW max Drive Level Parameters Fundamental Overtone Frequency,(Hz) 600k 1.0M 1.4M 1.8432M 2.4576M Motional Resistance, R1 (Ω) 300 400 600 500 1000 Motional Resistance, R1 max 3kΩ Motional Capacitance, C1 (fF) 3.5 2.0 1.3 3.5 1.5 Quality Factor, Q (k) 250 200 150 80 45 Shunt Capacitance, Co (pF) 1.0 0.8 0.7 1.0 0.8 Operating Temperature Ranges -10 to 70°C -40 to 85°C -55 to 125°C Environmental Parameters Shock: 1500g, 0.3ms, 1/2 sine Vibration: 20G rms, 10-2000Hz Random Storage Temperature Range: -55 to 125°C Manufacturing Details Process Temperature: 260°C for 20sec max Ordering Information Example: 1.0MHz CX4 EXT -SM1 500ppm -40 to 85C 7 FUND Minimum required* Frequency* Model* Termination* Frequency Tolerance* Operating Temperature Range* Load Capacitance Compliance RoHS Status (2011/65/EU) REACh Status MSL Rating (JDEC-STD-033): Optional Compliant Not Applicable Packaging Details Pack Style: Reel Pack Size: 1,000 Tape & reel in accordance with EIA-481-D Pack Style: Tray Pack Size: 1 Supplied on a tray Sales Office Contact Details: UK: +44 (0)1460 270200 France: 0800 901 383 Germany: 0800 1808 443 USA: +1.760.318.2824 Printed on 25 Apr 16 11:37 using Model Data Sheet V1.2550 Email: [email protected] Web: www.iqdfrequencyproducts.com Page 2 of 3 Quartz Crystal Specification CX4 EXT Electrical Specification - maximum limiting values Frequency Min Frequency Max 600.0kHz 1.4MHz Temperature Range °C -10 to 70 Stability (Min) ppm Over Tone Order ESR Fundamental 600 3OT 1,000 Ω -40 to 85 -55 to 125 1.8432MHz 2.5MHz -10 to 70 -40 to 85 -55 to 125 *Stability Maximum values ±0ppm This document was correct at the time of printing; please contact your local sales office for the latest version. Click to view latest version on our website. Sales Office Contact Details: UK: +44 (0)1460 270200 France: 0800 901 383 Germany: 0800 1808 443 USA: +1.760.318.2824 Printed on 25 Apr 16 11:37 using Model Data Sheet V1.2550 Email: [email protected] Web: www.iqdfrequencyproducts.com Page 3 of 3