CX MINIATURE CRYSTALS CX-6V-SM EUROQUARTZ Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: [email protected] Web: www.euroquartz.co.uk Page 800kHz to 1.35MHz ULTRA-LOW PROFILE MINIATURE SMD CRYSTAL 1 of 2 ! ! ! ! ! ! ! ! General Description The CX-6-SM quartz crystals are leadless devices designed for surface mounting on printed circuit boards or hybrid substrates. The crystals are intended for use in Pierce oscillators. Hermetically sealed in a miniature ceramic package, the crystals are produced utilizing a photo-lithographic process ensuring consistent high quality production units. 800kHz to 1.35MHz Extensional A ±0.05% (±500ppm B ±0.1% C ±1.0% 7pF Load Capacitance: 5kW max. Motional Resistance (R1): 1.2fF Motional Capacitance (C1): 150k Quality Factor (Q): 1.0pF Shunt Capacitance (C0): 3mW max. Drive Level: 35°C Turning Point (T0)**: -0.035ppm/°C2 Temperature Coefficient (k): Note: frequency (f) deviation from frequency (f0) at turning point temperature = f-fo k(T-To)2 = fo ±5ppm max. Ageing, first year: 1000g peak, 0.3ms, ½ sine Shock, survival: 10g rms 20-1,000Hz random Vibration, survival: -10°~+70°C (commercial) Operating Temperature: -40°~+85°C (industrial) -55°~+125°C (military) -55°C~+125°C Storage Temperature: 260°C for 20 sec. Process Temperature: A D Outline B C CX-6-SM Package Dimensions Dimension Typical (mm) Maximum (mm) A 6.73 B 2.62 2.90 C - see below D 1.27 1.52 Dimension “C” Glass Lid (mm max.) 7.11 Ceramic Lid (mm max.) SM1 0.99 1.35 SM2 1.04 1.40 SM3 1.12 1.47 Specifications are typical at 25°C unless otherwise indicated. * ** Equivalent Circuit 1 L1 C1 R1 C0 R 1 Motional Resistance Specification Frequency Range: Functional Mode: Calibration Tolerance*: D (TO P) Ultra-low profile (1mm) Extensional mode Ideal for use with microprocessors Designed for low power applications Compatible with hybrid or PCB packaging Low ageing Full military environmental testing available Ideal for battery operated applications L 1 Motional Inductance C 1 Motional Capacitance C0 Shunt Capacitance 2 Closer calibration available Other Turning Point available CX MINIATURE CRYSTALS CX-6V-SM EUROQUARTZ Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: [email protected] Web: www.euroquartz.co.uk Page 800kHz to 1.35MHz ULTRA-LOW PROFILE MINIATURE SMD CRYSTAL 2 of 2 Conventional HCMOS Pierce Oscillator Circuit Circuit Design Rf Amplifier Buffer Typical Pierce Oscillator Application The low profile CX miniature surface-mount crystal is ideal for small, battery operated portable products. The CX crystal designed in a Pierce oscillator (single inverter) circuit has a very low current consumption with high stability. A conventional HCMOS Pierce oscillator circuit is shown below. The crystal is effectively inductive and in a Pi network with C1 and C2 which provides the additional phase-shift necessary to sustain oscillation. The oscillation frequency (f0) is 15ppm to 150ppm above the crystal’s series resonant frequency (FS). C1 Osc. Freq. (Fo) RA CS C2 CX-2 Solder Pad Layout Drive Level 1.78 RA is used to limit the crystal’s drive level by forming a voltage divider between RA and C1. RA also stabilizes the oscillator against changes in the amplifiers output resistance (R0). RA should be increased for higher voltage operation. 3.05 5.46 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: C x C2 CL = 1 C C1 + C2 + S NOTE: C1 and C2 include stray layout capacitance to ground. CS is the stray shunt capacitance between the crystal terminals. In practice, the effective valus of CL will be less than that calculated from C1, C2, and CS values due to the effect of the amplifier output resistance. CS should be minimized. Terminations Termination Designation SM1 Gold Plated SM2 Nickel, Solder Plated SM3 Nickel, Solder Plated and Solder Dipped The oscillation frequency (f0) is approximately equal to: f 0 = f S 1+ C1 2(C0 + CL ) Where FS = Series resonant frequency of the crystal C1 = Motional Capacitance C0 = Shunt Capacitance Packaging CX-6V-SM- Tray Pack (Standard) - 16mm tape, 178mm or 330mm reels (Optional) per EIA 481 Order Code CX-6 C = Ceramic Lid Blank = Glass Lid -SM1 “S” if special or custom design Blank if standard SM1 SM2 SM3 Frequency 1.0MHz ( A Calibration Tolerance* @ 25°C A, B, C *For other calibration tolerances enter figure in ppm / I ) Temperature Range: C = Commercial I = Industrial M = Military S = Specify