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PDF ASM3P2760A Data sheet ( Hoja de datos )

Número de pieza ASM3P2760A
Descripción Peak EMI Reducing Solution
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ASM3P2760A Hoja de datos, Descripción, Manual
ASM3P2760A
Peak EMI Reducing Solution
Product Description
The ASM3P2760A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock frequencies.
The ASM3P2760A reduces electromagnetic interference (EMI) at the
clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2760A 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 ASM3P2760A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2760A 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 an EMI Optimized Clock Signal at the Output
Integrated Loop Filter Components
Operates with a 2.5/3.3 V Supply
Operating Current less than 4 mA
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: ±0.65% @ 8 MHz
Available in TSOP−6 Package
This Device is Pb-Free and is RoHS Compliant
Applications
The ASM3P2760A is targeted towards all portable devices like
MP3 players 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
±200 ps (Typ)
45/55%
FIN/256
±0.65% @ 8 MHz
www.onsemi.com
1
TSOP−6
CASE 318G
PIN CONNECTION
PD 1
6 VSS
XOUT 2 ASM3P2760A 5 ModOUT
XIN/CLKIN 3
4 VDD
MARKING DIAGRAM
E4LAYWG
G
1
E4L = 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:
ASM3P2760/D

1 page

ASM3P2760A pdf
ASM3P2760A
Table 9. TYPICAL CRYSTAL SPECIFICATIONS
Fundamental AT Cut Parallel Resonant Crystal
Rating
Nominal Frequency
8 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 3. Typical Crystal Interface Circuit
VDD
C1
0.1 mF
VDD
C2
2.2 mF
ASM3P2760A
ModOUT
Rs
ModOUT Clock
VSS
Figure 4. Typical Application Schematic
www.onsemi.com
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