p2160a PulseCore Semiconductor, p2160a Datasheet - Page 3

• Manufacturer Part Number: p2160a
• Description: High Frequency Lcd Panel Emi Reduction Ic
• Manufacturer: PulseCore Semiconductor

October 2003
rev E
Table-1 Modulation Selection
Spread Spectrum Selection
Table 1 illustrates the possible spread spectrum options. 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: the center frequency is the frequency of the external reference input on CLKIN, Pin 1).
Example: P2160 is designed for high-resolution flat panel applications and is able to support UXGA (1600 X
1200) flat panel that operates on 162 MHz (Fin) clock speed. A spreading selection of FS0=1, SR0=1 and
modulation rate selection MRA=1, enables input frequency range from 80 ~ 166 MHz and provides a
percentage deviation of +/-1.00% (see Table 1) of the input frequency (Fin). This results in frequency on
ModOUT being swept from 160.38 MHz to 163.62 MHz at a modulation rate of 42.18 KHz (162 MHz/80 MHz X
20.83KHz). This particular example (see below figure) given here is a common EMI reduction method for
notebook and LCD monitor manufacturers and has already been implemented by most of the leading OEM and
mobile graphic accelerator manufacturers.
Application Schematic for Mobile LCD Graphics Controllers
FS0
0
0
0
0
1
1
1
1
MRA
0
0
1
1
0
0
1
1
SR0
0
1
0
1
0
1
0
1
Frequency Range
Notice: The information in this document is subject to change without notice.
80-166MHz
80-166MHz
80-166MHz
80-166MHz
40-80MHz
40-80MHz
40-80MHz
40-80MHz
High Frequency LCD Panel EMI Reduction IC
Spread Range
+/- 1.00%
+/- 1.00%
+/- 0.5%
+/- 1.0%
+/- 0.5%
+/- 1.0%
+/- 0.5%
+/- 0.5%
(Fin/40) * 34.72 KHz
(Fin/40) * 34.72 KHz
(Fin/40) * 20.83 KHz
(Fin/40) * 20.83 KHz
(Fin/80) * 34.72 KHz
(Fin/80) * 34.72 KHz
(Fin/80) * 20.83 KHz
(Fin/80) * 20.83 KHz
Modulation Rate
P2160
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