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SM840051KA датащи(PDF) 8 Page - Micrel Semiconductor |
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SM840051KA датащи(HTML) 8 Page - Micrel Semiconductor |
8 / 10 page Micrel, Inc. SM840051 May 2010 8 M9999-050710-C 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 SM840051 has been characterized with 19.44MHz, 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. |
Аналогичный номер детали - SM840051KA |
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Аналогичное описание - SM840051KA |
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