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SM840021KA Scheda tecnica(PDF) 9 Page - Micrel Semiconductor |
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SM840021KA Scheda tecnica(HTML) 9 Page - Micrel Semiconductor |
9 / 10 page Micrel, Inc. SM840021 March 2010 9 M9999-031810-B hbwhelp@micrel.com or (408) 955-1690 Total capacitance seen by crystal = CL = 1 1 + 1 (Ct1 + Cb1 + Cd1) (Ct2 + Cb2 + Cd2) Example: CL = 18pF, Cb = 2pF, Cd = 4pF Trim Cap = Ct = 2 (18pF) - (2pF +4pF) = 30pF The SM840021 has been characterized with 25MHz, 18pF parallel resonant crystal. The trim capacitors Ct1 and Ct2 were optimized to minimize the ppm error. To minimize the board capacitance, a short trace from pin to crystal footprint without vias is desirable. It is preferable to have ground shielding or distance between the crystal traces and noisy signals on the board. Board Layout |
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