ASM3P2760_15 Datasheet, PDF (1/7 Pages) ON Semiconductor – Peak EMI Reducing Solution

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
V_DD = 2.5/3.3 V
±200 ps (Typ)
45/55%
F_IN/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
1
July, 2015 − Rev. 3
Publication Order Number:
ASM3P2760/D