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  ON Semiconductor Electronic Components Datasheet  

ASM3P2870A Datasheet

Low Power Peak EMI Reducing Solution

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ASM3P2870A pdf
ASM3P2870A
Low Power Peak EMI
Reducing Solution
Description
The ASM3P2870A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock frequencies.
The ASM3P2870A reduces electromagnetic interference (EMI) at the
clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2870A 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 ASM3P2870A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2870A 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 ASM3P2870A 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:
13 MHz to 30 MHz for 2.5 V
13 MHz to 30 MHz for 3.3 V
Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
Frequency Deviation: ±0.75% (Typ) @ 22 MHz Input Frequency
Available in 6pin TSOT23, 8pin SOIC and 8pin TSSOP
Packages
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
http://onsemi.com
TSOT6
O SUFFIX
CASE 419AF
TSSOP8
T SUFFIX
CASE 948AL
SOIC8
S SUFFIX
CASE 751BD
PIN CONFIGURATIONS
1
REFOUT
VSS
XOUT
ModOUT
XIN / CLKIN
VDD
6Pin TSOT23 Package
(Top View)
XIN / CLKIN
XOUT
1
VDD
NC
REFOUT
ModOUT
NC VSS
8Pin SOIC and TSSOP Packages
(Top View)
KEY SPECIFICATIONS
Description
Supply Voltages
CycletoCycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 3.3 V / 2.5 V
200 pS (Max)
45/55%
FIN/640
±0.75% (Typ) @
22 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
August, 2011 Rev. 3
1
Publication Order Number:
ASM3P2870A/D


  ON Semiconductor Electronic Components Datasheet  

ASM3P2870A Datasheet

Low Power Peak EMI Reducing Solution

No Preview Available !

ASM3P2870A pdf
ASM3P2870A
VDD
XIN
XOUT
Crystal
Oscillator
REFOUT
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
VSS
Figure 1. Block Diagram
Table 1. PIN DESCRIPTION (6Pin TSOT23 Package)
Pin#
Pin Name
Type
Description
1 REFOUT O Buffered output of the input frequency.
2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected.
3 XIN / CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. It can be
connected either to an external crystal or an external reference clock.
4 VDD P Power supply for the entire chip.
5 ModOUT O Spread spectrum clock output.
6 VSS P Ground connection.
Table 2. PIN DESCRIPTION (8Pin SOIC and TSSOP Packages)
Pin#
Pin Name
Type
Description
1 XIN / CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. It can be
connected either to an external crystal or an external reference clock.
2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected.
3 REFOUT O Buffered output of the input frequency.
4 NC No connect.
5 VSS P Ground connection.
6 ModOUT O Spread spectrum clock output.
7 NC No connect.
8 VDD P Power supply for the entire chip.
http://onsemi.com
2


Part Number ASM3P2870A
Description Low Power Peak EMI Reducing Solution
Maker ON Semiconductor
Total Page 10 Pages
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