ASM3P2969A Datasheet, PDF (1/10 Pages) Alliance Semiconductor Corporation – Low Power Peak EMI Reducing Solution

ASM3P2969A
Low Power Peak EMI
Reducing Solution
Description
The ASM3P2969A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock frequencies.
The ASM3P2969A reduces electromagnetic interference (EMI) at the
clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2969A 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 ASM3P2969A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2969A 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 ASM3P2969A is targeted towards all portable devices with
very low power requirements like MP3 players, Notebooks 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:
6 MHz to 12 MHz for 2.5 V
6 MHz to 13 MHz for 3.3 V
• Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
• Frequency Deviation: ±1% @ 10 MHz
• Available in 6−pin TSOT−23, 8−pin SOIC and 8−pin TSSOP
Packages
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
http://onsemi.com
TSOT−6
O SUFFIX
CASE 419AF
TSSOP−8
T SUFFIX
CASE 948AL
SOIC−8
S SUFFIX
CASE 751BD
PIN CONFIGURATIONS
1
REFOUT/2
VSS
XOUT
ModOUT
XIN / CLKIN
VDD
6−Pin TSOT−23 Package
(Top View)
1
XIN / CLKIN
VDD
XOUT
NC
REFOUT/2
ModOUT
NC
VSS
8−Pin SOIC and TSSOP Packages
(Top View)
KEY SPECIFICATIONS
Description
Supply Voltages
Cycle−to−Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 3.3 V / 2.5 V
200 pS (Max)
45/55%
F_IN/256
±1% @ 10 MHz
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 − Rev. 3
Publication Order Number:
ASM3P2969A/D