SM803020 Datasheet, PDF (10/14 Pages) Micrel Semiconductor – Flexible Ultra-Low Jitter Clock Synthesizer

Micrel, Inc.
Application Information
Input Reference
When operating with a crystal input reference, do not apply
a switching signal to a 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 more details.
Contact Micrel’s HBW applications group if you need help
selecting a suitable crystal for your application at:
[e-mail].
Power Supply Filtering Recommendations
SM803020
Figure 2. Duty Cycle Timing
Figure 3. All Outputs Rise/Fall Time
Figure 1. Recommended Power Supply Filtering
• Use the power supply filtering shown in Figure 1 for
VDDAP1, VDDAP2, VDDI1 and VDDI2.
• Connect the VDDO and VDD pins directly to the VDD
power plane.
• Connect all VSS pins directly to the ground power
plane.
July 22, 2013
10
Revision 1.0
[e-mail] or [phone]