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I2779AF-08SR View Datasheet(PDF) - Alliance Semiconductor

Part Name
Description
View to exact match
I2779AF-08SR
Alliance
Alliance Semiconductor Alliance
I2779AF-08SR Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
June 2005
P2779A
rev 0.1
Spread Spectrum Selection
The P2779A performs zero cycle slip when set at low percentage spreading. This prevents any occurrence of system timing
error. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is
described as a percentage deviation of the center frequency. (Note that the center frequency is the frequency of the external
reference input on XIN/CLKIN, pin 1.)
The P2779A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for
operation from 20MHz to 38MHz. The P2779A’s spread percentage selection is determined by the external LF value
specified in the Loop Filter Selection Table. The external LF allows the user to fine tune the spread percentage to optimize
the EMI reduction benefits of the spread spectrum.
Application Schematic
27 MHz
C2
1 XIN/CLKIN VDD 8
2 XOUT
VDD
REF 7
3 PD ModOUT 6
R1
C1
4 LF
VSS 5
P2779A
0.1µF
+3.3V
Modulated 27MHz
PD selection: Power dissipation can be reduced by completely turning off the IC.
Low-Cost Notebook EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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