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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.
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.
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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.
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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 -0.5 to VDD+0.5 -65 to +125 0 to 70 260 150 2
Unit
V C C C C KV
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability.
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+ 25C) unless otherwise stated)
Symbol
VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT
* XIN is pulled low
Parameter
Input low voltage Input high voltage Input low current Input high current XOUT output low current (VXOL@0.4V, VDD=3.3V) XOUT output high current (VXOH@2.5V, VDD=3.3V) Output low voltage (VDD = 3.3V, IOL = 10mA) Output high voltage (VDD = 3.3V, IOH = 10mA) Static supply current* Dynamic supply current ( VDD =3.3V) Operating Voltage Power-up time (first locked cycle after power-up) Output impedance
Min
GND - 0.3 2.0 2.5 3.0 -
Typ
3 3 TBD TBD 3.3 TBD
Max
0.8 VDD + 0.3 -35 35 0.4 3.6 5 -
Unit
V V A A mA mA V V A mA V mS
Custom Clock generator for LCD Project
Notice: The information in this document is subject to change without notice.
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November 2006 rev 0.1
AC Electrical Characteristics Symbol
XIN Input frequency CLK1 CLK2 FOUT Output frequency CLK3 CLK4 (SS Clock ) CLK5 (SS Clock ) fd tLH* tHL * tJC tD Frequency Deviation (CLK4, CLK5 ) For SS% = 0 For SS% = 1 40 -
ASM3P2856A ASM3P2856B
Parameter
Min
-
Typ
14.7456 27.002 14.7456 65 65 65 1.0 1.5 1.4 1.2 TBD 50
Max
-
Unit
MHz
MHz
60
% nS nS pS %
Output rise time (measured from 0.8 to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (Cycle to cycle) Output duty cycle
* tLH and tHL are measured into a capacitive load of 15pF
Custom Clock generator for LCD Project
Notice: The information in this document is subject to change without notice.
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November 2006 rev 0.1
Package Information
ASM3P2856A ASM3P2856B
16-lead Thin Shrunk Small Outline Package (4.40-MM Body)
8
1
PIN 1 ID E H
9
16
A
Seating Plane L C
e D
A2
B
A1
Dimensions Symbol Min
A A1 A2 B C D E e H L 0.020 0 0.002 0.031 0.007 0.004 0.193 0.169 0.026 BSC 0.252 BSC 0.030 8 0.50 0
Inches Max
0.043 0.006 0.041 0.012 0.008 0.201 0.177 0.05 0.80 0.19 0.09 4.90 4.30
D
Millimeters Min Max
1.20 0.15 1.05 0.30 0.20 5.10 4.50 0.65 BSC 6.40 BSC 0.75 8
Custom Clock generator for LCD Project
Notice: The information in this document is subject to change without notice.
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November 2006 rev 0.1
Ordering Codes Ordering Code
ASM3P2856AG-16-TT ASM3P2856AG-16-TR ASM3P2856BG-16-TT ASM3P2856BG-16-TR
ASM3P2856A ASM3P2856B
Marking
3P2856AG 3P2856AG 3P2856BG 3P2856BG
Package Type
16-pin 4.4-mm TSSOP - TUBE, Green 16-pin 4.4-mm TSSOP - TAPE & REEL,Green 16-pin 4.4-mm TSSOP - TUBE, Green 16-pin 4.4-mm TSSOP - TAPE & REEL,Green
Operating Range
Commercial Commercial Commercial Commercial
Device Ordering Information
ASM3P2856AG-16-TR
R = Tape & Rzeel, T = Tube or Tray O = SOT S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN DEVICE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE, LEAD FREE, and RoHS DEVICE NUMBER X= Automotive I= Industrial P or n/c = Commercial (-40C to +125C) (-40C to +85C) (0C to +70C) 1 = Reserved 2 = Non PLL based 3 = EMI Reduction 4 = DDR support products 5 = STD Zero Delay Buffer 6 = Power Management 7 = Power Management 8 = Power Management 9 = Hi Performance 0 = Reserved U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70
PulseCore Semiconductor Mixed Signal Product
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
Custom Clock generator for LCD Project
Notice: The information in this document is subject to change without notice.
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November 2006 rev 0.1
ASM3P2856A ASM3P2856B
PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com
Copyright (c) PulseCore Semiconductor All Rights Reserved Preliminary Information Part Number: ASM3P2856A ASM3P2856B Document Version: v0.1
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003
(c) Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of PulseCore. All other brand and product names may be the trademarks of their respective companies. PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein represents PulseCore's best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. PulseCore does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of PulseCore products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in PulseCore's Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively according to PulseCore's Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of PulseCore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use.
Custom Clock generator for LCD Project
Notice: The information in this document is subject to change without notice.
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