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PDF ASM3P2274A Data sheet ( Hoja de datos )
| Número de pieza | ASM3P2274A | |
| Descripción | 4X Multiplier EMI Reduction IC | |
| Fabricantes | ON Semiconductor | |
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ASM3P2274A
4x Multiplier EMI
Reduction IC
Product Description
The ASM3P2274 is a versatile Spread Spectrum Frequency
Modulator designed specifically for a wide range of clock frequencies.
It provides a 4x Spread Spectrum Modulated output from an input
clock source.
The ASM3P2274A reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2274A 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 ASM3P2274A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2274A 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.’
Features
• Generates a 4x EMI Optimized Clock Signal at the Output
• Integrated Loop Filter Components
• Operates with a 2.5/3.3 V Supply
• CMOS Design
• Input Frequency Range:
♦ 12 MHz to 30 MHz for 2.5 V
♦ 12 MHz to 30 MHz for 3.3 V
• Frequency Deviation: −1.5% (Typ) @ 66 MHz Output Frequency
• Available in TSOP−6 Package
• This Device is Pb-Free and is RoHS Compliant
Applications
The ASM3P2274A is targeted towards all portable devices like
MP3 players, MFP, LCD Panel Module and digital still cameras.
Table 1. KEY SPECIFICATIONS
Description
Supply Voltages
Cycle-to-Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 2.5/3.3 V
±360 ps (Typ)
45/55%
FIN/640
−1.5% (Typ) @ 66 MHz Output
www.onsemi.com
1
TSOP−6
CASE 318G
PIN CONNECTION
PD 1
6 VSS
XOUT 2 ASM3P2274A 5 ModOUT
XIN/CLKIN 3
4 VDD
MARKING DIAGRAM
Z4LAYWG
G
1
Z4L = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 6 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
July, 2015 − Rev. 3
1
Publication Order Number:
ASM3P2274/D
1 page  
ASM3P2274A
Table 10. TYPICAL CRYSTAL SPECIFICATIONS
Fundamental AT Cut Parallel Resonant Crystal
Rating
Nominal Frequency
14.31818 MHz
Frequency Tolerance
±50 ppm or Better at 25°C
Operating Temperature Range
−25 to +85°C
Storage Temperature
−40 to +85°C
Load Capacitance (CP)
Shunt Capacitance
18 pF
7 pF Maximum
ESR
25 W
NOTE: CL is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency.
R
Crystal
Rx
CL CL
CL = 2 ⋅ (CP − CS)
Where: CL = Load Capacitance of Crystal
CS = Stray Capacitance due to CIN, PCB, Trace, etc.
Figure 4. Typical Crystal Interface Circuit
VDD
C1
0.1 mF
VDD
C2
2.2 mF
ASM3P2274A
ModOUT
Rs
ModOUT Clock
VSS
Figure 5. Typical Application Schematic
www.onsemi.com
5
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