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SM840001KA 数据表(PDF) 6 Page - Micrel Semiconductor

部件名 SM840001KA
功能描述  106.25MHz Ultra-Low Jitter Clock Synthesizer
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制造商  MICREL [Micrel Semiconductor]
网页  http://www.micrel.com
标志 MICREL - Micrel Semiconductor

SM840001KA 数据表(HTML) 6 Page - Micrel Semiconductor

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Micrel, Inc.
SM840001
March 2010
6
M9999-031810-B
hbwhelp@micrel.com or (408) 955-1690
Power Supply Filtering
The SM840001 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.
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 of the
crystal must be considered in order to calculate
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
0.1m
W
Crystal Input Interface


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