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SM840004-11KA 数据表(PDF) 8 Page - Micrel Semiconductor |
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SM840004-11KA 数据表(HTML) 8 Page - Micrel Semiconductor |
8 / 10 page Micrel, Inc. SM840004-11 July 2010 8 M9999-070110-A hbwhelp@micrel.com or (408) 955-1690 Power Supply Filtering The SM840004-11 provides separate power supply pins to isolate any high switching noise from outputs to internal core blocks. VDD and VDDA should be individually connected to the power plane through vias. Bypass capacitors should be used for each pin. Figure 2, illustrates how the power supply filter for 3.3V and 2.5V is configured. Figure 2. Power Supply Filter Crystal Loading Crystal Recommendations This device requires a parallel resonance crystal. Substituting a series resonance crystal will cause this device to operate at the wrong frequency and violate the ppm specifications. To achieve low ppm error, the total capacitance the crystal will see must be considered to calculate the appropriate capacitive loading (CL). Load Capacitance at each side: Trim Capacitance = Ct = (2*CL-(Cb + Cd)) CL: Crystal load capacitance. Defined by manufacturer Ct: External trim capacitors. (Trimmed CL Load capacitance to get the right ppm) Cb: Board capacitance (vias, traces, etc.) Cd: Internal capacitance of the device (lead frame, bond wires, pin, etc.) Equivalent Series Resistance (ESR) Max. Cut Load Cap. Shunt Cap. Max. Drive Max. 50Ω AT 18pF 7pF 0.1mW Crystal Input Interface |
类似零件编号 - SM840004-11KA |
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类似说明 - SM840004-11KA |
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