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ASM3P2759A Datasheet, PDF (1/9 Pages) Alliance Semiconductor Corporation – Low Power Peak EMI Reducing Solution | |||
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ASM3P2759A
Low Power Peak EMI
Reducing Solution
Description
The ASM3P2759A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock frequencies.
The ASM3P2759A reduces electromagnetic interference (EMI) at the
clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2759A allows significant system cost
savings by reducing the number of circuit board layers, ferrite beads
and shielding that are traditionally required to pass EMI regulations.
The ASM3P2759A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2759A modulates the output of a single PLL in order to
âspreadâ 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 signalâs bandwidth is called âspread
spectrum clock generation.â
Applications
The ASM3P2759A is targeted towards all portable devices with
very low power requirements like MP3 players and digital still
cameras.
Features
⢠Generates an EMI Optimized Clock Signal at the Output
⢠Integrated Loop Filter Components
⢠Operates with a 3.3 V / 2.5 V Supply
⢠Operating Current less than 4 mA
⢠Low Power CMOS Design
⢠Input Frequency Range:
3 MHz to 5 MHz for 2.5 V
3 MHz to 6 MHz for 3.3 V
⢠Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
⢠Frequency Deviation: ±1% @ 3 MHz
⢠Available in 6âpin TSOTâ23, 8âpin SOIC and 8âpin TSSOP
Packages
⢠These Devices are PbâFree, Halogen Free/BFR Free and are RoHS
Compliant
http://onsemi.com
TSOTâ6
O SUFFIX
CASE 419AF
TSSOPâ8
T SUFFIX
CASE 948AL
SOICâ8
S SUFFIX
CASE 751BD
PIN CONFIGURATIONS
1
PD
VSS
XOUT
ModOUT
XIN / CLKIN
VDD
6âPin TSOTâ23 Package
(Top View)
1
XIN / CLKIN
VDD
XOUT
NC
PD
ModOUT
NC
VSS
8âPin SOIC and TSSOP Packages
(Top View)
KEY SPECIFICATIONS
Description
Supply Voltages
CycleâtoâCycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 3.3 V / 2.5 V
200 pS (Max)
45/55%
FIN/128
±1% @ 3 MHz
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 â Rev. 3
Publication Order Number:
ASM3P2759A/D
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