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CX-2-SM31.0B 데이터시트(PDF) 2 Page - EUROQUARTZ limited |
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CX-2-SM31.0B 데이터시트(HTML) 2 Page - EUROQUARTZ limited |
2 / 2 page 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 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 approximately equal to: 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+ Circuit Design Order Code CX-2 “S” if special or custom design Blank if standard Frequency SM1 SM2 SM3 Calibration Tolerance* @ 25°C A, B, C 1.0MHz -SM1 CX-2-SM - Bulk Pack (Standard) - 16mm tape, 178mm or 330mm reels (Optional) per EIA 481 - Tray Pack (Optional) Packaging 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 Terminations Designation SM1 Gold Plated SM2 Nickel, Solder Plated SM3 Nickel, Solder Plated and Solder Dipped Termination Conventional HCMOS Pierce Oscillator Circuit CX-2 Buffer Amplifier Osc. Freq. (Fo) C C C5 RB R) CX-2-SM 760kHz to 1.35MHz LOW-PROFILE SMD CRYSTAL CX-2-SM 760kHz to 1.35MHz LOW-PROFILE 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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