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SM802141UMG Datasheet(PDF) 7 Page - Micrel Semiconductor |
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SM802141UMG Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 13 page Micrel, Inc. SM802141 April 2012 7 M9999-041812-A hbwhelp@micrel.com or (408) 955-1690 Application Information Input Reference When operating with a crystal input reference, do not apply a switching signal to REF_IN. Crystal Layout Keep the layers under the crystal as open as possible and do not place switching signals or noisy supplies under the crystal. Crystal load capacitance is built inside the die so no external capacitance is needed. See the Selecting a Quartz Crystal for the Clockworks Flex I Family of Precision Synthesizers application note for further details. Contact Micrel’s HBW applications group if you need assistance on selecting a suitable crystal for your application at hbwhelp@micrel.com. Parallel outputs to achieve four frequencies Four frequencies, 62.5MHz, 125MHz, 156.25MHz and 312.5MHz can be achieved in one output channel by shorting Q1 and Q2 outputs together at the device pins. Frequency selection is achieved using FSEL, OE1 and OE2 pins as outlined in the Output Selection Table. |
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