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CX-3-SM31.0A Fiches technique(PDF) 2 Page - EUROQUARTZ limited |
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CX-3-SM31.0A Fiches technique(HTML) 2 Page - EUROQUARTZ limited |
2 / 2 page Order Code CX-3 “S” if special or custom design Blank if standard Frequency SM1 SM2 SM3 Calibration Tolerance* @ 25°C A, B, C 1.0MHz -SM1 Circuit Design Temperature Range: C = Commercial I = Industrial M = Military S = Specify (A / I ) C = Ceramic Lid Blank = Glass Lid *For other calibration tolerances enter figure in ppm Solder Pad Layout 1.78 3.05 5.46 CX-3H-SM- Bulk Pack (Standard) - 16mm tape, 178mm or 330mm reels (Optional) per EIA 481 - Tray Pack (Optional) Packaging Conventional HCMOS Pierce Oscillator Circuit CX-2 Buffer Amplifier Osc. Freq. (Fo) C C C5 RB R) 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 C and C which provides the additional phase-shift necessary to sustain oscillation. The oscillation frequency (f ) is 15ppm to 150ppm above the crystal’s series resonant frequency (F ). R is used to limit the crystal’s drive level by forming a voltage divider between R andC.R also stabilizes the oscillator against changes in the amplifiers output resistance (R ). R should be increased for higher voltage operation. The CX crystal calibration tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (C .) C is 12 0 S A A1 A 0A LL Drive Level Load Capacitance C = Cx C C+ C 2 2 1 1 LS C + 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 fromC,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: 12 S L 12 S 0 Where F = Series resonant frequency of the crystal C = Motional Capacitance C = Shunt Capacitance S 1 0 f = C1 0 fS 2(C+ C) 0L 1+ CX-3-SM 800kHz to 1.35MHz LOW-PROFILE MINIATURE SMD CRYSTAL CX-3-SM 800kHz to 1.35MHz LOW-PROFILE MINIATURE SMD CRYSTAL +44(0)1460 230000 +44(0)1460 230001 sales@euroquartz.co.uk www.euroquartz.co.uk Telephone: Fax: Email: Web: EUROQUARTZ CX MINIATURE CRYSTALS Page 2of2 |
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