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| CX MINIATURE CRYSTALS 530kHz to 2.1MHz MINIATURE SMD CRYSTAL EUROQUARTZ Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk CX-1-SM Page 1 of 2 General Description The miniature CX-1-SM crystals in leadless ceramic packages have been designed for surface-mounting on printed circuit boards or hybrid circuits. Hermitically sealed in a rugged, miniature ceramic package, the CX-1-SM crystal is manufactured using a photolithographic process. Extensional mode Ideal for use with microprocessors Designed for low-power applications Compatible with hybrid or PC board packaging Low ageing Full military environmental testing available Ideal for battery operated applications Specification D (TO P) A E D B C E Outline CX-1-SM Package Dimensions Dimension Typical (mm) Maximum (mm) 530kHz to 2 .1MHz Extensional A 0.05% (500ppm) B 0.1% C 1.0% 7pF Load Capacitance: 3kW max. Motional Resistance (R): 1.2fF Motional Capacitance (C): 150k Quality Factor (Q): 1.0pF Shunt Capacitance (C): 3mW max. Drive Level: 35C Turning Point (T)**: Note: Frequency (f) deviation from frequency (f0) @ turning point temperature (T0): f-fo k(T-To) = fo Ageing, first year: Shock, survival: Vibration, survival: Operating Temperature: Storage Temperature: Process Temperature: 5ppm max. 750g 0.3ms, 1/2 sine 10g rms, 20-1,000Hz random -10~+70C (commercial) -40~+85C (industrial) -55~+125C (military) -55C~+125C 260C for 20 seconds Frequency Range: Functional Mode: Calibration Tolerance*: A B C D E Dimension "C" 8.00 3.56 1.14 1.52 Glass Lid (mm max.) 8.38 3.94 see below 1.40 1.78 Ceramic Lid (mm max.) Specifications are typical at 25C unless otherwise indicated. * ** Tighter frequency calibration available Other turning point available SM1 SM2 SM3 1.65 1.70 1.78 1.78 1.83 1.90 Equivalent Circuit L R Solder Pad Layout C C 6.86 1 2 1.78 4.06 L Motional Inductance C Motional Capacitance C Shunt Capacitance R Motional Resistance CX MINIATURE CRYSTALS 530kHz to 2.1MHz MINIATURE SMD CRYSTAL EUROQUARTZ Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk CX-1-SM Page 2 of 2 Circuit Design Typical Pierce Oscillator Application The low profile CX miniature surface-mount crystal is ideal for small, battery operated portable products. The CX crystal design 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). Conventional HCMOS Pierce Oscillator Circuit RB Amplifier Buffer Osc. Freq. (Fo) C5 R) C Drive Level CX-1 C 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. 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 Terminations Designation Termination 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. The oscillation frequency (f0) is approximately equal to: SM1 SM2 SM3 Gold Plated Nickel, Silver Plated Nickel, Solder Plated and Solder Dipped Packaging CX-1-SM - Tray Pack (Standard) - 16mm tape, 178mm or 330mm reels (Optional) per EIA 481 C1 f 0 = f S 1+ 2(C0 + CL ) Where FS = Series resonant frequency of the crystal C1 = Motional Capacitance C0 = Shunt Capacitance Order Code CX-1 Blank = Glass Lid C = Ceramic Lid Frequency -SM1 1.0MHz SM1 SM2 SM3 Calibration Tolerance* @ 25C (A) *For other (B) calibrations (C) insert value in ppm (A / I) Temperature Range: C = Commercial I = Industrial M = Military S = Specify "S" if special or custom design Blank if standard |
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