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CX-1S-031.0B Datasheet(PDF) 2 Page - EUROQUARTZ limited |
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CX-1S-031.0B Datasheet(HTML) 2 Page - EUROQUARTZ limited |
2 / 2 page C = Cx C C+ C 2 2 1 1 LS C + Typical application for Pierce oscillator 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 ). R is used to limit the crystals drive level by forming a voltage divider between R and C . 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: 1 2 0 S A A1 A 0A L L Drive Level Load Capacitance Order Code CX-1 “S” if special or custom design Blank if standard Frequency Side leads Calibration Tolerance* @ 25°C (A) (B) (C) 1.0MHz -03 *For other calibrations insert value in ppm CX-1-03 530kHz to 2.1MHz MINIATURE QUARTZ CRYSTAL FOR PARALLEL OSCILLATORS CX-1-03 530kHz to 2.1MHz MINIATURE QUARTZ CRYSTAL FOR PARALLEL OSCILLATORS Typical Application 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: 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+ Conventional HCMOS Pierce Oscillator Circuit CX-1 Buffer Amplifier Osc. Freq. (Fo) C C C5 RB R) CX-1-03 - Tray Pack (Standard) Packaging Temperature Range: C = Commercial I = Industrial M = Military S = Specify (A/I) Blank = Glass Lid C = Ceramic Lid +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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