3.4 Input Clocks
The Si5332-AM2 device can support 3 sources of input reference clock. One source is the crystal input on XA/XB pins. (
XA can also be
used as a single-ended external input if the crystal is removed, see Si5332-AM2 Data Sheet for more details
.). The other 2 are separate
external input clock sources which can be either differential or single-ended clocks.
As shown in the schematic below, the Si5332-8A-EVB is pre-populated with a 25 MHz crystal on the XA/XB crystal input. Both
differential external clock inputs have 50-ohm terminations installed by default. The CLKIN1 input has “not-installed” (“NI”) components
to isolate the CLKIN1 input from the crystal circuit when the crystal is installed.
Figure 3.3. Si5332-8A-EVB Input Clock Circuit
UG398: Si5332-8A-EVB User's Guide (Using Si5332-AM2-QFN40-EVB) • Si5332-8A-EVB Operation
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 21, 2022
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