MK1709AGTR [ICSI]
Low EMI Clock Generator; 低EMI时钟发生器
| 型号： | MK1709AGTR |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Low EMI Clock Generator |
| 文件： | 总9页 (文件大小：170K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK1709
Low EMI Clock Generator
Description
Features
The MK1709 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.
• Packaged in 8-pin SOIC (MK1709S) and in 8-pin
TSSOP (MK1709AG)
• 8-pin TSSOP available in lead (Pb) free package
• Provides a spread spectrum output clock
• Supports flat panel controllers
• Guaranteed to +85°C operation
• Accepts a clock input, provides same frequency
The MK1709 offers centered 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.
dithered output
• Good for all VGA modes from 80 to 167 MHz
• Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
ICS offers many other clocks for computers and
computer peripherals. Consult us when you need to
remove crystals and oscillators from your board.
• Low EMI feature can be disabled
• Includes power-down
• Operating voltage of 3.3 V
• Advanced, low-power CMOS process
Block Diagram
VDD
S0
S1
S2
PLL Clock
Synthesis
Low EMI Enable
and Spread
Spectrum
Circuitry
Clock Out
Input
Buffer
ICLK
GND
MDS 1709 D
1
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
Pin Assignment
Spread Percentage and Direction
Select Table
ICLK
VDD
GND
CLK
8
7
6
5
1
2
3
4
S2
S2
Pin 8
(1709S) (1709S) (1709S)
Pin 6 Pin 5 Pin 4
(1709AG) (1709AG) (1709AG)
S1
Pin 7
S0
Pin 6
Frequency
Range
Spread
Percentage
(%)
S1
S0
LEE
0
0
0
0
0
40-50
40-50
±0.9
±0.7
8-pin SOIC (MK1709S)
M
0
0
1
40-50
(MK1709S)
25-50
±0.8
GND
CLK
LEE
S0
8
7
6
5
1
2
3
4
VDD
ICLK
(MK1709AG)
0
M
0
40-50
(MK1709S)
25-50
±0.6
S2
S1
(MK1709AG)
0
0
0
0
0
M
M
1
M
1
40-50
50 -100
±1.1
±0.6
±0.7
±0.8
—
8-pin TSSOP (MK1709AG)
0
50 -100
1
M
1
50 -100
1
Power Down
1
1
0
0
0
50 -100
50 -100
±0.9
±1.1
M
1
1
1
1
1
1
1
0
M
M
M
1
1
0
100-165
100-165
±0.7
±0.6
±1.1
±1.35
±0.8
±0.9
—
M
1
100-165
100-165
0
100-165
1
M
1
100-165
1
Power Down
0 = connect to GND
M = unconnected (floating) has internal Pull up resistor
to VDD and is considered as a 1 state
1 = connect directly to VDD
MDS 1709 D
2
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
Pin Descriptions (MK1709S)
Pin
Pin
Pin Type
Pin Description
Number Name
1
2
3
4
5
6
ICLK
VDD
GND
CLK
LEE
S0
Input
Connect to graphics input clock.
Power Connect to +3.3 V.
Power Connect to ground.
Output Spread spectrum clock output per table above.
Input
Input
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.
7
8
S1
S2
Input
Input
Function select 1 input. Selects spread amount and direction per table above.
Internal mid-level.
Function select 2 input. Selects spread amount and direction per table above.
Pin Descriptions (MK1709AG)
Pin
Pin
Pin Type
Pin Description
Number Name
1
2
3
4
GND
CLK
LEE
S0
Power Connect to ground.
Output Spread spectrum clock output per table above.
Input
Input
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.
5
S1
Input
Function select 1 input. Selects spread amount and direction per table above.
Internal mid-level.
6
7
8
S2
Input
Input
Function select 2 input. Selects spread amount and direction per table above.
Connect to graphics input clock.
ICLK
VDD
Power Connect to +3.3 V.
MDS 1709 D
3
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
External Components
The MK1709 requires a minimum number of external
components for proper operation.
PCB layout Recommendations
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
Decoupling Capacitor
A decoupling capacitor of 0.01µF must be connected
between VDD and GND on pins 2 and 3 for the
MK1709S, or pins 1 and 8 for the MK1709AG. Place
the capacitor 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.
1) The 0.01µF 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
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) Place a 33Ω series termination resistor (if needed)
close to the clock output to minimize EMI.
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 50Ω trace (a commonly used
trace impedance), place a 33Ω resistor in series with
the clock line, as close to the clock output pin as
possible. The nominal impedance of the clock output is
20Ω.
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 MK1709. This includes signal traces just
underneath the device, or on layers adjacent to the
ground plane layer used by the device.
Select Pin Operation
The S1, S0 select pins are 2-level, meaning they have
three separate states to make the selections shown in
the table on page 2.
MDS 1709 D
4
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK1709. 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. Typical values are at 25°C.
Item
Rating
Supply Voltage, VDD (referenced to GND)
All Inputs and Outputs (referenced to GND)
Ambient Operating Temperature
5 V
-0.5 V to VDD+0.5 V
0 to +85°C
Storage Temperature
-65 to +150°C
260°C
Soldering Temperature (maximum of 10 seconds)
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+85
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
0
+3.135
+3.6
V
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85°C
Parameter
Symbol
VDD
IDD
Conditions
Min.
Typ.
Max.
Units
Operating Voltage
3.135
3.465
V
Supply Current (MK1709S)
Supply Current (MK1709AG)
No load, at 3.3 V
No load, 50M
20
13
23
mA
µA
IDD
IDD
No load, 150M
Input High Voltage (ICLK)
Input High Voltage (S1, S0)
Input High Voltage (other inputs)
Input Low Voltage (ICLK)
Input Low Voltage
V
V
V
(VDD/2)+1 VDD/2
V
V
IH
IH
IH
VDD-0.5
2
V
V
V
VDD/2 (VDD/2)-1
0.5
V
IL
IL
V
Output High Voltage (CMOS)
Output High Voltage
V
V
I
I
I
= -4mA
VDD-0.4
2.4
V
OH
OH
OH
OH
OL
= -12 mA
= 12 mA
V
Output Low Voltage
V
0.4
V
OL
Input Capacitance
C
S0, S1, S2, LEE pins
7
pF
IN
MDS 1709 D
5
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
AC Electrical Characteristics (MK1709S)
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85° C
Parameter
Symbol
Conditions
Min.
80
Typ. Max. Units
Input/Output Clock Frequency
Input Clock Duty Cycle
167
80
MHz
%
Time above VDD/2
Time above 1.5 V
0.8 to 2.0V
20
Output Clock Duty Cycle
Output Clock Rise Time
Output Clock Fall Time
40
50
1.5
60
%
t
ns
OR
t
2.0 to 0.8V
1.5
ns
OF
EMI Peak Frequency Reduction
3rd - 19th odd
harmonics
7 to 14
dB
AC Electrical Characteristics (MK1709AG)
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85° C
Parameter
Symbol
Conditions
Min.
25
Typ. Max. Units
Input/Output Clock Frequency
Input Clock Duty Cycle
Output Clock Duty Cycle
165
80
MHz
%
Time above VDD/2
20
Time above 1.5 V,
40 MHz - 100 MHz
40
50
45
35
55
%
Time above 1.5 V,
100 MHz - 150 MHz
%
%
Time above 1.5 V,
>150 MHz
Output Clock Rise Time
Output Clock Fall Time
t
0.8 to 2.0V
2.0 to 0.8V
1.5
1.5
ns
ns
dB
OR
t
OF
EMI Peak Frequency Reduction
3rd - 19th odd
harmonics
7 to 14
Marking Diagrams
(Marking for lead (Pb) free device shown below)
8
5
8
5
1
MK1709S
YYWW
######
MK1709AG
YYWWLF
######
4
1
4
MDS 1709 D
6
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
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
Inches
Symbol
A
Min
Max
1.75
0.25
0.51
0.25
5.00
4.00
Min
Max
1.35
0.10
0.33
0.19
4.80
3.80
.0532
.0040
.013
.0075
.1890
.1497
.0688
.0098
.020
.0098
.1968
.1574
A1
E
H
INDEX
AREA
B
C
D
E
e
1
2
1.27 BASIC
0.050 BASIC
H
h
L
5.80
0.25
0.40
0°
6.20
.2284
.010
.016
0°
.2440
.020
.050
8°
D
0.50
1.27
8°
α
A
h x 45
A1
C
- C -
e
SEATING
PLANE
B
L
.10 (.004)
C
MDS 1709 D
7
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
Package Outline and Package Dimensions (8-pin TSSOP, 173 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Min Max
Inches
Max
8
Symbol
A
Min
--
--
1.20
0.15
1.05
0.30
0.20
3.10
0.047
0.006
0.041
0.012
A1
A2
b
0.05
0.80
0.19
0.09
3.90
0.002
0.032
0.007
E1
E
INDEX
AREA
C
D
E
0.0035 0.008
0.114 0.122
0.252 BASIC
0.169 0.177
0.0256 Basic
6.40 BASIC
4.30 4.50
0.65 Basic
1
2
E1
e
L
D
0.45
0°
0.75
8°
0.018
0.030
8°
α
0°
aaa
-
0.10
-
0.004
A
2
A
A
1
c
- C -
e
SEATING
PLANE
b
L
aaa
C
MDS 1709 D
8
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK1709
Low EMI Clock Generator
Ordering Information
Part / Order Number Marking
Shipping
packaging
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Package
Temperature
MK1709S
MK1709STR
MK1709AG
(see page 6)
MK1709AGTR
MK1709AGLF
8-pin SOIC
8-pin SOIC
8-pin TSSOP
8-pin TSSOP
8-pin TSSOP
8-pin TSSOP
0 to +85° C
0 to +85° C
0 to +85° C
0 to +85° C
0 to +85° C
0 to +85° C
MK1709AGLFTR
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 1709 D
9
Revision 031204
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
相关型号：
©2020 ICPDF网 联系我们和版权申明