SM802149UMG Просмотр технического описания (PDF) - Micrel

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производитель

SM802149UMG

156.25MHz/312.5MHz and 78.125MHz/156.25MHz LVDS Clock Synthesizer

Micrel 

Micrel, Inc.

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.

SM802149

Contact Micrel’s HBW applications group if you need

assistance to select a suitable crystal for your application

at hbwhelp@micrel.com

LVDS Outputs

Terminate LVDS outputs with 100Ω across Q and /Q.

For best performance, load all outputs. Outputs can be

DC or AC-coupled.

Figure 1. Duty Cycle Timing

Figure 2. All Outputs Rise/Fall Time

March 1, 2013

Figure 3. RMS Phase/Noise/Jitter

9

Revision 1.1

hbwhelp@micrel.com or (408) 955-1690

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