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ASM3P2856A Dataheets PDF



Part Number ASM3P2856A
Manufacturers PulseCore Semiconductor
Logo PulseCore Semiconductor
Description Custom Clock generator
Datasheet ASM3P2856A DatasheetASM3P2856A Datasheet (PDF)

www.DataSheet4U.com November 2006 rev0.1 Custom Clock generator for LCD Projector Features • • • • ASM3P2856A ASM3P2856B Product Description 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 (± 20 ppm) has +/- 0.5% or +/- 1% sprea.

  ASM3P2856A   ASM3P2856A


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www.DataSheet4U.com November 2006 rev0.1 Custom Clock generator for LCD Projector Features • • • • ASM3P2856A ASM3P2856B Product Description 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 (± 20 ppm) 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. 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 • 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 • • • Applications ASM3P2856A/B is targeted for use in LCD Projectors. Supply voltage range 3.3V ± 0.3V. Available in 16 Pin TSSOP Available in Commercial Temperature range Block Diagram VDD SSON SS% CLK1 XIN XOUT CLK2 Crystal Oscillator PLL CLK3 CLK4 CLK5 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. www.DataSheet4U.com November 2006 rev 0.1 Pin Configuration XIN XOUT VDD VDD GND GND CLK1 CLK2 1 2 3 4 5 6 7 8 16 15 14 13 ASM3P2856A ASM3P2856B VDD NC GND SSON SS% CLK5 CLK4 CLK3 VDD NC GND NC NC CLK5 CLK4 CLK3 XIN XOUT VDD VDD GND GND CLK1 CLK2 1 2 3 4 5 6 7 8 16 15 14 13 ASM3P2856A ASM3P2856B 12 11 10 9 12 11 10 9 Pin Description Pin# 1 2 3 4 5 6 7 8 9 10 11 12 Pin Name XIN XOUT VDD VDD GND GND CLK1 CLK2 CLK3 CLK4 CLK5 NC SS% NC Type I O P P P P O O O O O I I P P Description Connection to crystal or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. Connection to crystal. If using an external reference clock, this pin must be left unconnected. Power supply for the entire Chip Power supply for the entire Chip Ground to entire chip Ground to entire chip 27.002 MHz Clock output. Refer to Input & Output Frequency Table for details. Reference Clock Output. Refer to Input & Output Frequency Table for details. 65 MHz non-spread Clock output. Refer to Input & Output Frequency Table for details. 65 MHz Spread Spectrum Clock Output. Refer to Input & Output Frequency Table for details. 65 MHz Spread Spectrum Clock Output. Refer to Input & Output Frequency Table for details. No Connection for ASM3P2856A Spread percentage selection pin for ASM3P2856B. Refer to Spread Selection Table for details. Has an internal pull down resistor No Connection for ASM3P2856A Spread spectrum selection. When SSON is HIGH, spread spectrum is enabled and when LOW, it turns off the spread spectrum. Connect the pin to ground When Spread Spectrum feature is not required. Has an internal pull up resistor. Ground to entire chip No Connection Power supply for the entire Chip 13 14 15 16 SSON GND NC VDD Custom Clock generator for LCD Project Notice: The information in this document is subject to change without notice. 2 of 8 www.DataSheet4U.com November 2006 rev 0.1 Input & Output Clock Frequency Table Input Frequency CLK1 CLK2 CLK3 14.7456 MHz CLK4 65 MHz Spread Spectrum Clock (+/-0.5 or +/- 1%) CLK5 65 MHz Spread Spectrum Clock (+/-0.5 or +/-1%) ASM3P2856A ASM3P2856B Output Frequencies Frequency Accuracy of synthesized clocks ±20 ppm Zero ppm ±15 ppm ±15 ppm 27.002 MHz 14.7456 MHz 65 MHz Non- Spread clock ±15 ppm Spread Selection Table SS% 0 1 Spread Percentage ± 1.0% ± 1.5% Typical Application Schematic for LCD Projector + 3.3V 14.7456 MHz fundamental Crystal + 3.3V 1 2 3 XIN XOUT VDD VDD NC 16 15 GND 14 SSON 13 0.1uF 4 VDD 5 6 Make SSON Pin HIGH to enable Spread Spectrum SS% Pin selects different Spread deviations 65MHz SS Clock 65MHz SS Clock 65MHz Clock ASM3P2856B GND GND CLK1 SS% CLK5 CLK4 CLK3 12 11 10 9 27.002MHz Clock 14.7456MHz Clock 7 8 CLK2 Custom Clock generator for LCD Project Notice: The information in this document is subject to change without notice. 3 of 8 www.DataSheet4U.com November 2006 rev 0.1 Absolute Maximum Ratings Symbol VDD VIN TSTG TA Ts TJ TDV ASM3P2856A ASM3P2856B Parameter Power Supply Voltage relative to GND Input Voltage relative to GND (Input Pins) Storage temperature Operating temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B) Rating -0.5 to +4.6.


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