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SL38000ZI-XXX Scheda tecnica(PDF) 10 Page - SpectraLinear Inc |
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SL38000ZI-XXX Scheda tecnica(HTML) 10 Page - SpectraLinear Inc |
10 / 12 page Rev 1.1, August 7, 2008 Page 10 of 12 SL38000 PCin(pF) =PCout(pF)= [(CL(pF) – Cp(pF)/2)] x 2 Where CL is crystal load capacitor as given by the crystal datasheet and Cp(pF) is the compensation factor for the total parasitic capacitance at XIN or XOUT pin including PCB related parasitic capacitance. As an example; if a crystal with CL=18pF is used and Cp=4pF, by using the above formula, PCin=PCout=[(18-(4/2)] x 2 = 32pF. Programming PCin and PCout to 32pF assures that this crystal sees an equivalent load of 18pF and no other external crystal load capacitor is needed. Deviating from the crystal load specification could cause an increase in frequency accuracy in ppm. Refer to the Table 5 for the recommended crystal specifications. Recommended External Crystal Specifications (XO Version) Parameter Description Min Typ Max Unit Comments FNOM Nominal Crystal Frequency Range 8 - 48 MHz Fundamental Mode – AT Cut CL Nominal Crystal Load 6 12 18 pF Load for +/-0 ppm Fo resonance value R1,1 Equivalent Series Resistance 20 40 100 Ohm F-Range: 8.0 to 12.999 MHz R1,2 Equivalent Series Resistance 12.5 25 60 Ohm F-Range: 13.0 to 19.999 MHz R1,3 Equivalent Series Resistance 10 20 50 Ohm F-Range: 20.0 to 48.000 MHz DL1,1 Crystal Drive Level - - 200 µW F-Range: 8.0 to 19.999 MHz DL1,2 Crystal Drive Level - - 150 µW F-Range: 20.0 to 48.000 MHz Co1 Shunt Capacitance - 4 5.4 pF SMD Xtals Co2 Shunt Capacitance - 5 7.2 pF Through Hole (Leaded) Xtals Table 3. Recommended Crystal Specifications |
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