ASM3P2856A Datasheet, PDF (1/8 Pages) PulseCore Semiconductor – Custom Clock generator for LCD Projector

November 2006
rev0.1
Features
Custom Clock generator for LCD Projector
Product Description
ASM3P2856A
ASM3P2856B
• Custom Clock Generator for LCD Projector
• Generates EMI optimized clock signals for
LCD Projector system
• Uses an inexpensive 14.7456 MHz crystal for
generating the required Outputs
• Frequency outputs:
• CLK1 : 27.002MHz (± 20 ppm)
• CLK2 : 14.7456MHz (Zero ppm)
• CLK3 : 65MHz (± 15 ppm)
• CLK4,CLK5 : 65MHz (±15 ppm) Spread
Spectrum Clock
• ASM3P2856A: +/- 1% centre spread
ASM3P2856B: selectable +/-1.0% & +/-1.5%
Centre Spread option
• Supply voltage range 3.3V ± 0.3V.
• Available in 16 Pin TSSOP
• Available in Commercial Temperature range
ASM3P2856A/B generate the required four custom clock
frequencies for the LCD Projector. An inexpensive
14.7456MHz crystal is used to generate a 14.7456MHz
used by the microcomputer, a 27MHz used by Video, a
non-spread 65MHz, and a centre spread 65MHz clock used
by the LCD projector system. The spread spectrum clock
has +/- 0.5% or +/- 1% spread options. The spread
spectrum clock of ASM3P2856A/B reduces electromagnetic
interference (EMI) at the clock source. This allows
significant system cost savings by reducing the number of
circuit board layers and shielding that are required to pass
EMI regulations.
Applications
ASM3P2856A/B is targeted for use in LCD Projectors.
Block Diagram
V_{DD SSON SS%}
XIN
XOUT
Crystal
Oscillator
CLK1
CLK2
PLL
CLK3
CLK4
CLK5
GND
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: [phone] • Fax: [phone]
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.