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PDF PCS3P2191A Data sheet ( Hoja de datos )
| Número de pieza | PCS3P2191A | |
| Descripción | Spread Spectrum Clock Generator | |
| Fabricantes | PulseCore Semiconductor | |
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January 2007
PCS3P2191A
rev 0.1
Spread Spectrum Clock Generator
Features
• Generates four 4X low EMI spread spectrum clocks
• Input frequency: 15MHz
• Output frequency: 60MHz
• Internal loop filter minimizes external components
and board space
• Selectable Centre Spread frequency deviation:
±0.5%, ±0.75%, ± 1.0%,
± 1.25%, ± 1.5%, ± 1.75% ± 2.0%
• 3.3V ± 0.3V Operating Voltage
• Commercial Temperature range
• Available in 16-pin TSSOP
• Advanced low power CMOS process
Product Description
PCS3P2191A is a versatile spread spectrum frequency
modulator that generates four low EMI 4x clocks at the
output. PCS3P2191A
www.DataSheet4U.com
offers seven selectable centre spread options of ±0.5% to
±2.0%, and a no spread option. (Refer Spread Deviation
Selection Table). PCS3P2191A reduces electromagnetic
interference (EMI) at the clock source, allowing system
wide reduction of EMI of all clock dependent signals.
The PCS3P2191A allows significant system cost savings
by reducing the number of circuit board layers, ferrite
beads, and shielding that are traditionally required to
pass EMI regulations. The PCS3P2191A uses the most
efficient and optimized modulation profile approved by
the FCC and is implemented in a proprietary all digital
method.
Application
PCS3P2191A is targetted for LCD panel application
Block Diagram
S2 S1 S0
VDD
2
CLKIN / XIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
4
5
GND
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
1 page  
January 2007
rev 0.1
Typical Crystal Oscillator Circuit
PCS3P2191A
www.DataSheet4U.com
Crystal
R1 = 510Ω
C1 C2
Typical Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
Frequency tolerance
Operating temperature range
Storage temperature
Load capacitance
Shunt capacitance
ESR
15MHz
± 50 ppm or better at 25°C
-25°C to +85°C
-40°C to +85°C
18pF
7pF maximum
25Ω
Spread Spectrum Clock Generator
Notice: The information in this document is subject to change without notice.
5 of 8
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet PCS3P2191A.PDF ] | |
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