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PDF ASM3P2590A Data sheet ( Hoja de datos )
| Número de pieza | ASM3P2590A | |
| Descripción | Low Power Peak EMI Reducing Solution | |
| Fabricantes | PulseCore Semiconductor | |
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www.DataSheet4U.com
September 2006
rev 0.4
ASM3P2590A
Low Power Peak EMI Reducing Solution
Features
• Generates a 1X low EMI optimized clock signal at the
output.
• Integrated loop filter components.
• Operates with a 3.3 / 2.5V Supply.
• Operating current less than 5mA.
• Low power CMOS design.
• Input frequency range
60MHz to 120MHz for 2.5V
60MHz to 120MHz for 3.3V
• Frequency deviation: ±0.75% (Typ) @85MHz Output
frequency.
• Available in 6-pin TSOT-23 Package.
Product Description
The ASM3P2590A is a versatile spread spectrum
frequency modulator designed specifically for a wide
range of clock frequencies. The ASM3P2590A reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2590A allows significant
system cost savings by reducing the number of circuit
board layers ferrite beads, shielding that are traditionally
required to pass EMI regulations.
The ASM3P2590A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all digital method.
The ASM3P2590A 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’.
Applications
The ASM3P2590A is targeted towards all portable
devices with very low power requirements like MP3
players,MFP, LCD Panel Module and digital still cameras.
Key Specifications
Description
Supply voltages
Cycle-to-Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 3.3V / 2.5V
360pS (Typ)
45/55%
FIN/2560
±0.75% (Typ) @85MHz
Output
Block Diagram
VDD
SSON
CLKIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
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.
1 page  
September 2006
rev 0.4
Package Information
6-pin TSOT-23 Package
www.DataSheet4U.com
ASM3P2590A
Symbol
A
A1
A2
b
H
D
B
e
C
L
θ
Dimensions
Inches
Millimeters
Min Max
Min
Max
0.04 1.00
0.00 0.004
0.00
0.10
0.033
0.036
0.84
0.90
0.012
0.02
0.30
0.50
0.005 BSC
0.127 BSC
0.114 BSC
2.90 BSC
0.06 BSC
1.60 BSC
0.0374 BSC
0.950 BSC
0.11 BSC
2.80 BSC
0.0118
0.02
0.30
0.50
0° 4°
0°
4°
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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