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W180

Description
Peak Reducing EMI Solution
File Size181KB,10 Pages
ManufacturerCypress Semiconductor
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W180 Overview

Peak Reducing EMI Solution

W180
Peak Reducing EMI Solution
Features
Cypress PREMIS™ family offering
• Generates an EMI optimized clocking signal at the
output
• Selectable output frequency range
• Single 1.25% or 3.75% down or center spread output
• Integrated loop filter components
• Operates with a 3.3V or 5V supply
• Low power CMOS design
• Available in 8-pin SOIC (Small Outline Integrated
Circuit)
FS2
0
0
1
1
FS1
0
1
0
1
-01, 51
(MHz)
8 < F
IN
< 10
10 < F
IN
< 15
15 < F
IN
< 18
18 < F
IN
< 28
SS%
0
1
Table 1. Modulation Width Selection
W180-01, 02, 03
Output
W180-51, 52, 53
Output
F
in
> F
out
> F
in
– 1.25% F
in
+ 0.625% > F
in
> – 0.625%
F
in
> F
out
> F
in
– 3.75% F
in
+ 1.875% > F
in
> –1.875%
Table 2. Frequency Range Selection
W180 Option#
-02, 52
(MHz)
8 < F
IN
< 10
10 < F
IN
< 15
N/A
N/A
-03, 53
(MHz)
N/A
N/A
15 < F
IN
< 18
18 < F
IN
< 28
Key Specifications
Supply Voltages:............................................V
DD
= 3.3V±5%
or V
DD
= 5V±10%
Frequency Range:...............................8 MHz < F
in
< 28 MHz
Cycle to Cycle Jitter: ........................................300 ps (max.)
Selectable Spread Percentage:.................... 1.25% or 3.75%
Output Duty Cycle: ............................... 40/60% (worst case)
Output Rise and Fall Time:...................................5 ns (max.)
Simplified Block Diagram
3.3V or 5.0V
Pin Configurations
SOIC
W180-01/51
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8
7
6
5
FS2
FS1
VDD
CLKOUT
X1
XTAL
Input
X2
W180
Spread Spectrum
Output
(EMI suppressed)
W180-02/03
W180-52/53
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8
7
6
5
SSON#
FS1
VDD
CLKOUT
3.3V or 5.0V
Oscillator or
Reference Input
W180
Spread Spectrum
Output
(EMI suppressed)
Cypress Semiconductor Corporation
Document #: 38-07156 Rev. *B
198 Champion Court
San Jose
,
CA 95134-1709
408-943-2600
Revised October 5, 2005

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