CX-2-021.0C

CX MINIATURE CRYSTALS 760kHz to 1.35MHz MINIATURE QUARTZ CRYSTAL EURO QUARTZ Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk CX-2 Page 1 of 2 General Description The CX-2 quartz crystal is a high quality extensional mode resonator. The CX-2 is hermetically sealed in a rugged, miniature ceramic package, a quarter the size of an eight pin dual-in-line package. The crystal is manufactured utilizing a photo-lithographic process, ensuring consistency and repeatability of electrical characteristics. -02 End Lead 2.39 1 2 3 5.21 A 1.27 5.08 2.54 -03 Side Lead 6.60 2.39 1 6.60 5.33 2 -04 Side Lead 6.60 3 3 1 2        Extensional mode Ideal for use with microprocessors Designed for low-power applications Compatible with hybrid or PCB Low ageing Ideal for battery powered applications Full military environmental testing available Specification 760kHz to 1.35MHz Extensional A ±0.05% (±50ppm) B ±0.1% C ±1.0% 5kW max. Motional Resistance (R): 1.2fF Motional Capacitance (C): 150k Quality Factor (Q): 1.0pF max. Shunt Capacitance (C): 3mW max. Drive Level: 35°C Turning Point (T)**: -0.035ppm/°C Temperature Coefficient (k): Note: frequency (f) deviation from frequency (fo) @ turning point temperature (To): f-fo k(T-To) = Frequency Range: Functional Mode: Calibration Tolerance*: 2 Outline and Dimensions Notes: 1. Terminal 1 is electrically connected to terminal 3. 2. Lead Dimensions: width 0.33mm typical, thickness 0.18mm. 3. A = Glass Lid - 2.03mm max. Ceramic Lid - 2.41mm max. Equivalent Circuit L R 1 C C 2 ±5ppm max. 1,000g 0.3ms, ½ sine 10g rms 20 - 1,000Hz -10°~+70°C (commercial) -40°~+85°C (industrial) -55°~+125°C (military) -55°C~+125°C Storage Temperature: Lead to Package temp. not to Process Temperature: exceed 175°C Glass lid to package seal rim temp. not to exceed 210°C Specifications are typical at 25°C unless otherwise indicated. * Closer calibration available ** Other turning point available Ageing, first year: Shock, survival: Vibration, survival: Operating Temperature: fo R  Motional Resistance L  Motional Inductance C  Motional Capacitance C Shunt Capacitance CX MINIATURE CRYSTALS 760kHz to 1.35MHz MINIATURE QUARTZ CRYSTAL EURO QUARTZ Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk CX-2 Page 2 of 2 Typical Application Typical application for Pierce oscillator Conventional HCMOS Pierce Oscillator Circuit RB Amplifier The low-profile CX miniature leaded crystal is ideal for small, high density, battery operated portable products. A CX crystal incorporated into a Pierce oscillator (single inverter) circuit provides a high stability with low current consumption. A conventional HCMOS Pierce oscillator circuit is shown below. The crystal is effectively inductive and in a Pi-network circuit with C and C providing the additional phase shift necessary to sustain oscillation. The oscillation frequency (f ) is 15 to 150ppm above the crystals series resonant frequency (f ). 1 2 0 S Buffer Osc. Freq. (Fo) C5 R) Drive Level A R is used to limit the crystal’s drive level by forming a voltage divider between R and C . R also stabilizes the oscillator against changes in the amplifier’s output resistance (R ). R should be increased for higher voltage operation. A 1 A 0 A C CX-2 C Load Capacitance L Packaging CX-2-Leaded - Tray Pack (Standard) The CX crystal calibration tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (C ). C is approximately equal to: L CL = 1 2 C1 x C2 C C1 + C2 + S S NOTE: C and C include stray layout capacitance to ground. C is the stray shunt capacitance between the crystal terminals. In practice, the effective valus of C will be less than that calculated from C , C , and CS values due to the effect of the amplifier output resistance. C should be minimized. The oscillation frequency (f ) is approximately equal to: L 1 2 S 0 f 0 = f S 1+ S C1 2(C0 + CL ) Where F = Series resonant frequency of the crystal C = Motional Capacitance C = Shunt Capacitance 1 0 Order Code Frequency CX-2 -03 1.0MHz (A / I) Temperature Range: C = Commercial I = Industrial M = Military S = Specify Leads “S” if special Calibration or custom design -02 Tolerance* Blank if standard -03 @ 25°C -04 (A) *For other (B) calibrations (C) insert value in ppm