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P1727F-08ST PDF预览

P1727F-08ST

更新时间: 2024-11-08 15:47:15
品牌 Logo 应用领域
ALSC 驱动光电二极管逻辑集成电路
页数 文件大小 规格书
6页 47K
描述
PLL Based Clock Driver, 1 True Output(s), 0 Inverted Output(s), CMOS, PDSO8, SOIC-8

P1727F-08ST 数据手册

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Preliminary Specification  
P1727/66  
Low Power Notebook LCD Panel EMI Reduction IC  
FEATURES  
Low inherent cycle-to-cycle jitter  
3.3V operating voltage  
FCC approved method of EMI attenuation  
Generates a low EMI spread spectrum of  
the input clock frequency  
CMOS/TTL compatible inputs and outputs  
Ultra low power CMOS design  
TBD mA @3.3V, 54 MHz  
TBD mA @3.3V, 65 MHz  
Optimized for frequency range:  
P1727X: 20MHz to 40MHz  
P1766X: 40MHz to 80MHz  
Supports notebook VGA and other LCD  
timing controller applications  
Internal loop filter minimizes external  
components and board space  
Available in 8 pin SOIC and TSSOP  
8 different frequency deviations ranging  
Qualified for Industrial Temp Spec. (+85C)  
from +/-0.625% to –3.50%  
The P1727/66 uses the most efficient and  
optimized modulation profile approved by the  
FCC and is implemented by using a proprietary  
all-digital method.  
PRODUCT DESCRIPTION  
The P1727/66 is a versatile spread spectrum  
frequency modulator designed specifically for a  
wide range of clock frequencies. The P1727/66  
reduces electromagnetic interference (EMI) at  
the clock source, allowing system wide  
reduction of EMI of down stream (clock and  
data dependent signals). The P1727/66 allows  
significant system cost savings by reducing the  
number of circuit board layers and shielding that  
are traditionally required to pass EMI  
regulations.  
APPLICATIONS  
The P1727/66 is targeted towards notebook  
LCD displays, other displays using an LVDS  
interface, PC peripheral devices, and embedded  
systems.  
Figure 1 – P1727/66 Pin Diagram  
The P1727/66 modulates the output of a single  
PLL in order to “spread” the bandwidth of a  
synthesized clock, thereby decreasing the peak  
amplitudes of its harmonics. This results in  
significantly lower system EMI compared to the  
typical narrow band signal produced by  
oscillators and most clock generators. Lowering  
EMI by increasing a signal’s bandwidth is called  
“spread spectrum clock generation”.  
CLKIN  
VDD  
1
2
3
8
7
6
5
PD#  
NC  
P1727X  
P1766X  
VSS  
NC  
ModOUT  
4
REF  
Oct., 2002  
Revision B  
3160 De La Cruz Blvd., Suite 200 • Santa Clara • CA • 95054  
Tel (408) 748-6988 • Fax (408) 748-0009  
1of 6  
http://www.pulsecore.com  

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