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January 2008 rev 1.3 Low Power Notebook LCD Panel EMI Reduction IC
Features
* * * * * * * * * FCC approved method of EMI attenuation. Generates a low EMI spread spectrum clock of the input frequency. Optimized for frequency range from 50 to 110MHz. Internal loop filter minimizes external components and board space. Four selectable spread ranges. Low inherent cycle-to-cycle jitter. 3.3V operating voltage range. TTL or CMOS compatible inputs and outputs. Ultra-low power CMOS design. * * * * * * * * 8.46 mA @3.3V, 54MHz 9.79 mA @3.3V, 65MHz 12.06 mA @3.3V, 81MHz 16.51 mA @3.3V, 108MHz
P1708C
down stream clock and data dependent signals. The P1708C allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations. The P1708C modulates the output of a single PLL in order to "spread" the bandwidth of a synthesized clock, and more importantly, decreases 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 frequency generators. Lowering EMI by increasing a signal's bandwidth is called `spread spectrum clock generation'. The P1708C uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method.
Supports notebook VGA and other LCD timing controller applications. Pinout compatible to ICS MK1708 and Cypress CY25560. SSON/SBM pin for Spread Spectrum On/Off and Standby Mode controls. Available in 8-pin SOIC and TSSOP.
Applications
The P1708C is targeted towards notebook LCD displays, and other displays using an LVDS interface, PC peripheral devices, and embedded systems.
Product Description
The P1708C is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies. The P1708C reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of
Block Diagram
SR0 SR1 SSON
VDD
Modulation CLKIN Frequency Divider Feedback Divider
PLL
Phase Detector
Loop Filter
VCO
Output Divider
ModOUT
VSS
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.
January 2008 rev 1.3
Pin Configuration
P1708C
CLKIN 1 VDD VSS 2 P1708C 3
8 7
NC SR0
6 SR1 5 SSON/SBM
ModOUT 4
Pin Description
Pin# 1 2 3 4 5 6 7 8 Pin Name CLKIN VDD VSS ModOUT SSON/SBM SR1 SR0 NC Type I P P O I I I Description Connect to externally generated clock signal. To put the part into standby mode, disable the input clock signal to this pin and pull SSON/SBM (pin 5) low. Refer Standby Mode Selection Table. Connect to +3.3V. Ground Connection. Connect to system ground. Spread spectrum clock output. Spread Spectrum On/Off and standby mode control. Refer Standby Mode Selection Table. This pin has an internal pull-up resistor. Digital logic input used to select Spreading Range. Refer Spread Spectrum Selection Table. This pin has an internal pull-up resistor. Digital logic input used to select Spreading Range. Refer Spread Spectrum Selection Table. This pin has an internal pull-up resistor. No connect.
Standby Mode Selection
CLKIN Disabled Disabled Enabled Enabled SSON/SBM 0 1 0 1 Spread Spectrum N/A N/A Off On ModOUT Disabled Disabled Reference Normal PLL Disabled Free Running Disabled Normal Mode Standby Free Running Buffer out Normal
Low Power Notebook LCD Panel EMI Reduction IC
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Spread Range Selection SR1
0 0 1 1
P1708C
SR0
0 1 0 1
Spreading Range
1.00% 2.00% 0.25% 0.75%
Modulation Rate
(FIN/40) * 62.49 KHz (FIN/40) * 62.49 KHz (FIN/40) * 62.49 KHz (FIN/40) * 62.49 KHz
Schematic for Notebook VGA Application
50MHz to 110MHz pixel clock input from VGA chip 1 0.1F FB VDD 3 VSS SR1 6 2 VDD SR0 7 Tie SR0 and SR1 high/low according to spread range desired. External resistors are not needed to pull these pins high. Pin 5 SSON should be left unconnected to turn on spread spectrum. Pull this pin low to turn spread spectrum OFF and enable stand-by mode. P1708C NC CLKIN
8
Pin 8 can be tied either high or low, or it can be left unconnected.
4 50MHz - 110MHz Pixel Clock Input from VGA Chip
ModOUT
SSON
5
Note: To set the P1708C to standby mode, disable the input clock (pin 1 CLKIN) and pull SSON (pin 5) low. Refer Standby Mode Selection Table.
Absolute Maximum Ratings Symbol
VDD, VIN TSTG TA Ts TJ TDV Storage temperature Operating temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B)
Parameter
Voltage on any pin with respect to Ground
Rating
-0.5 to +7.0 -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.
Low Power Notebook LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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January 2008 rev 1.3
DC Electrical Characteristics Symbol
VIL VIH IIL IIH IXOL IXOH VOL VOH ICC IDD VDD tON ZOUT Input low voltage Input high voltage Input low current (pull-up resistors on inputs SR0, SR1 and SSON/SBM) Input high current XOUT output low current @ 0.4V, VDD = 3.3V XOUT output high current @ 2.5V, VDD = 3.3V Output low voltage VDD = 3.3V, IOL = 20mA Output high voltage VDD = 3.3V, IOH = 20mA Dynamic supply current normal mode 3.3V and 10pF loading Static supply current standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock output impedance 2.7 2.5 7.90 9.79 0.6 3.3 0.18 50 3 3
P1708C
Parameter
Min
GND - 0.3 2.0
Typ
Max
0.8 VDD + 0.3 -35 35
Unit
V V A A mA mA
0.4
V V
17.53 fIN -max
mA mA
3.7
V mS
AC Electrical Characteristics Symbol
fIN fOUT tLH* tHL* tJC tD Input frequency Output frequency Output rise time Measured at 0.8V to 2.0V Output fall time Measured at 0.8V to 2.0V Jitter (cycle to cycle) Output duty cycle 45 50
Parameter
Min
50 50 0.7 0.6
Typ
Max
110 110
Unit
MHz MHz ns ns ps %
0.9 0.8
1.1 1.0 360 55
*tLH and tHL are measured into a capacitive load of 15pF
Low Power Notebook LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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January 2008 rev 1.3
Package Information 8-Pin SOIC Package
P1708C
E
H
D
A2
A
e B A 1
C L
D
Dimensions
Symbol Min
A1 A A2 B C D E e H L
Inches Max
0.010 0.069 0.059 0.020 0.010 0.004 0.053 0.049 0.012 0.007
Millimeters Min Max
0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8 0.25 1.75 1.50 0.51 0.25
0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8
Note: Controlling dimensions are millimeters. SOIC: 0.074 grams unit weight.
Low Power Notebook LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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January 2008 rev 1.3
8-Pin TSSOP
P1708C
H
E D A2 A e B A1 L C
Dimensions Symbol Min
A A1 A2 B c D E e H L 0.020 0 0.002 0.033 0.008 0.004 0.114 0.169 0.026 BSC 0.252 BSC 0.028 8 0.50 0
Inches Max
0.043 0.006 0.037 0.012 0.008 0.122 0.177 0.05 0.85 0.19 0.09 2.90 4.30
Millimeters Min Max
1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8
Low Power Notebook LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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January 2008 rev 1.3
Ordering Codes Part number
P1708CF-08ST P1708CF-08SR P1708CF-08TT P1708CF-08TR P1708CG-08ST P1708CG-08SR P1708CG-08TT P1708CG-08TR
P1708C
Marking
P1708CF P1708CF P1708CF P1708CF P1708CG P1708CG P1708CG P1708CG
Package Type
8-Pin SOIC, Tube, Pb Free 8-Pin SOIC, Tape and Reel, Pb Free 8-Pin TSSOP, Tube, Pb Free 8-Pin TSSOP, Tape and Reel, Pb Free 8-Pin SOIC, Tube, Green 8-Pin SOIC, Tape and Reel, Green 8-Pin TSSOP, Tube, Green 8-Pin TSSOP, Tape and Reel, Green
Temperature
Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial
Device Ordering Information
P1708C
F-08ST
SR - SOIC, T/R TT - TSSOP, TUBE TR - TSSOP, T/R ST - SOIC, TUBE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE, LEAD FREE, and RoHS Deviation (%) and Spread option Identifier DEVICE NUMBER P = Commercial Temperature Range (0C to 70C) I = Industrial Temperature Range (-40C to 85C)
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
Low Power Notebook LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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January 2008 rev 1.3
P1708C
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: P1708C Document Version: 1.3
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003 Many PulseCore Semiconductor products are protected by issued patents or by applications for patent
(c) Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks of PulseCore Semiconductor. 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.
Low Power Notebook LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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