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MK1707
Low EMI Clock Generator
Description
The MK1707 generates a low EMI output clock from a clock input. The part is designed to dither the LCD interface clock for flat panel graphics controllers. The device uses ICS' proprietary mix of analog and digital Phase Locked Loop (PLL) technology to spread the frequency spectrum of the output, thereby reducing the frequency amplitude peaks by several dB. The MK1707 offers both centered and down spread from a high speed clock input. Refer to the MK1714-01/02 for a crystal input and the widest selection of input frequencies and multipliers. ICS offers many other clocks for computers and computer peripherals. Consult us when you need to remove crystals and oscillators from your board.
Features
* * * * * * *
Packaged in 8-pin SOIC Available in Pb-free package Industrial temperature range available Provides a spread spectrum output clock Supports ATI's flat panel controllers Guaranteed to +85C operation Accepts a clock input, provides same frequency dithered output
* Good for all VGA modes from 80 to 167 MHz * Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
* * * *
Low EMI feature can be disabled Includes Power-down Operating voltage of 3.3 V or 5 V Advanced, low-power CMOS process
Block Diagram
VDD
S1:0 Spread Direction Low EMI Enable
2
PLL Clock Synthesis and Spread Spectrum Circuitry Input Buffer
Clock Out
ICLK
GND
MDS 1707 G Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 032204 tel (408) 297-1201
www.icst.com
MK1707
Low EMI Clock Generator
Pin Assignment
Spread Direction and Percentage Select Table
8 7 6 5 SD S1 S0 LEE
SD Pin 8 S1 Pin 7 S0 Pin 6 0 M 1 0 M 1 0 M 1 0 M 1 0 M 1 0 M 1 Spread Direction Down Down Down Down Center Down Down Center Down Center Down Power Down Center Center Center Center Center Center Test Center Power Down Spread Percentage (%) 0.6 0.8 1.25 +0.5, -1.5 2 +0.5, -2.5 +0.5, -3 5 0.35 0.5 0.7 0.8 1.1 1.4 Test 2.5 -
ICLK VDD GND CLK
1 2 3 4
8 pin (150 mil) SOIC
0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1
0 0 0 M M M 1 1 1 0 0 0 M M M 1 1 1
0 = connect to GND M = unconnected (floating) 1 = connect directly to VDD
Pin Descriptions
Pin Number Pin Name Pin Type Pin Description
1 2 3 4 5 6 7 8
ICLK VDD GND CLK LEE S0 S1 SD
Input Power Power Output Input Input Input Input
Connect to graphics input clock. Connect to +3.3 V. Connect to ground. Spread spectrum clock output per table above. Low EMI enable. Turns on spread spectrum when high. Internal pull-up resistor. Function select 0 input. Selects spread amount and direction per table above. Internal mid-level. Function select 1input. Selects spread amount and direction per table above. Internal mid-level. Spread direction select input. Selects the direction of spread per table above. Internal pull-up resistor.
MDS 1707 G Integrated Circuit Systems, Inc.
2
525 Race Street, San Jose, CA 95126
Revision 032204 tel (408) 297-1201
www.icst.com
MK1707
Low EMI Clock Generator
External Components
The MK1707 requires a minimum number of external components for proper operation.
the decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. 2) To minimize EMI, the 33 series termination resistor (if needed) should be placed close to the clock output. 3) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed away from the MK1707. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device.
Decoupling Capacitor
A decoupling capacitor of 0.01F must be connected between VDD and GND on pins 2 and 3, as close to these pins as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit.
Series Termination Resistor
When the PCB trace between the clock output and the load is over 1 inch, series termination should be used. To series terminate a 50 trace (a commonly used trace impedance), place a 33 resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20.
Powerup Considerations
To insure proper operation of the spread spectrum generation circuit, some precautions must be taken while utilizing the MK1707. 1. An input signal should not be applied to ICLK until VDD is stable (within 10% of its final value). This requirement can easily be met by operating the MK1707 and then ICLK source from the same power supply. 2. LEE should not be enabled (taken high) until after the power supplies and input clock are stable. This requirement can be met by direct control of LEE by system logic - for example, a "power good" signal. Another solution is to leave LEE unconnected to anything but a 0.01F capacitor to ground. The internal pullup resistor on LEE will charge the capacitor and provide approximately a 700s delay until spread spectrum is enabled. 3. If the input frequency is changed during operation, disable spread spectrum until the input clock stabilizes at the new frequency.
Tri-level Select Pin Operation
The S1, S0 select pins are tri-level, meaning they have three separate states to make the selections shown in the table on page 2. To select the M (mid) level, the connection to these pins must be eliminated by either floating them originally, or tri-stating the GPIO pins which drive the select pins.
PCB Layout Recommendations
For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01F decoupling capacitor should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between
MDS 1707 G Integrated Circuit Systems, Inc.
3
525 Race Street, San Jose, CA 95126
Revision 032204 tel (408) 297-1201
www.icst.com
MK1707
Low EMI Clock Generator
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK1707. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature, Commercial Ambient Operating Temperature, Industrial Storage Temperature Junction Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +85C -40 to +85C -65 to +150C 125C 260C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
0 +3.135
Typ.
Max.
+85 +5.5
Units
C
V
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85C
Parameter
Operating Voltage Supply Current
Symbol
VDD IDD IDD IDDPD
Conditions
No load, at 3.3 V No load, at 5 V S0=S1=SD=1 ICLK ICLK S1, S0 other inputs S0, S1, SD, LEE pins CMOS, IOH = -4 mA IOH = -12 mA IOL = -12 mA S0, S1, SD, LEE pins
Min.
3.135
Typ.
20 31 60
Max.
5.5
Units
V mA mA
A
Input High Voltage Input Low Voltage Input High Voltage Input High Voltage Input Low Voltage Output High Voltage Output High Voltage Output Low Voltage Input Capacitance
VIH VIL VIH VIH VIL VOH VOH VOL CIN
(VDD/2) + 1 VDD-0.5 2
VDD/2 VDD/2 (VDD/2) - 1
V V V V 0.5 V V V 0.4 V pF
VDD-0.4 2.4 5
MDS 1707 G Integrated Circuit Systems, Inc.
4
525 Race Street, San Jose, CA 95126
Revision 032204 tel (408) 297-1201
www.icst.com
MK1707
Low EMI Clock Generator
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85 C
Parameter
Input/Output Clock Frequency Input Clock Duty Cycle Output Clock Duty Cycle Output Rise Time Output Fall Time Modualtion Frequency EMI Peak Frequency Reduction
Symbol
Conditions
Time above VDD/2 Time above 1.5 V
Min.
80 20 40
Typ.
Max. Units
167 80 MHz % % ns ns 41 kHz dB
50 1.5 1.5
60
tOR tOF
0.8 to 2.0 V 2.0 to 0.8 V 19 3rd - 19th odd harmonics
7 to 14
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
150 140 120 40
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 1707 G Integrated Circuit Systems, Inc.
5
525 Race Street, San Jose, CA 95126
Revision 032204 tel (408) 297-1201
www.icst.com
MK1707
Low EMI Clock Generator
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
8
Millimeters Symbol Min Max
Inches Min Max
E INDEX AREA
H
12 D
A A1 B C D E e H h L
h x 45
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0 8
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0 8
A A1
C
-Ce
B SEATING PLANE L
.10 (.004)
C
Ordering Information
Part / Order Number
MK1707S MK1707STR MK1707SI MK1707SITR MK1707SLF MK1707SLFTR MK1707SILF MK1707SILFTR
Marking
MK1707S MK1707S MK1707SI MK1707SI MK1707SL MK1707SL MK1707SIL MK1707SIL
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
0 to +85 C 0 to +85 C -40 to +85 C -40 to +85 C 0 to +85 C 0 to +85 C -40 to +85 C -40 to +85 C
Note: "LF" denotes Pb (lead) free package.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
MDS 1707 G Integrated Circuit Systems, Inc.
6
525 Race Street, San Jose, CA 95126
Revision 032204 tel (408) 297-1201
www.icst.com

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