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部品番号 ASM3P2853A
部品説明 Peak EMI Reducing Solution
メーカ ON Semiconductor
ロゴ ON Semiconductor ロゴ 
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ASM3P2853A Datasheet, ASM3P2853A PDF,ピン配置, 機能
ASM3P2853A
Peak EMI Reducing Solution
Features
Generates an EMI optimized clock signal at output.
Input frequency: 25MHz.
Frequency outputs:
o USB Clock (48MHz unmodulated)
o 50MHz (modulated), ±1% centre spread
Modulation rate: 39KHz.
Spread Spectrum ON/OFF control
Supply voltage range 2.5V ± 5%.
Available in 8-Pin SOIC package.
Product Description
The ASM3P2853A is a versatile spread spectrum
frequency modulator. The ASM3P2853A reduces
electromagnetic interference (EMI) at the clock source.
The ASM3P2853A allows significant system cost savings
by reducing the number of circuit board layers and
shielding that are required to pass EMI regulations. The
ASM3P2853A modulates the output of PLL in order to
spread the bandwidth of a synthesized clock, thereby
decreasing 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 clock generators. Lowering EMI by increasing a
signal’s bandwidth is called spread spectrum clock
generation.
Applications
ASM3P2853A is targeted towards EMI management for
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
VDD
PWDNB
XIN
XOUT
SSONB
Crystal
Oscillator
VSS
PLL1
PLL2
USB Clock
(48MHz
Unmodulated)
50MHz
Modulated
©2010 SCILLC. All rights reserved.
FEBRUARY 2012 – Rev. 3
Publication Order Number:
ASM3P2853/D

--------------------------------------------
ASM3P2853A pdf, 電子部品, 半導体, ピン配列
ASM3P2853A
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VDD, VIN Voltage on any pin with respect to Ground
-0.5 to +4.6
V
TSTG
Storage temperature
-65 to +125
°C
Ts Max. Soldering Temperature (10 sec)
260 °C
TJ Junction Temperature
150 °C
TDV Static Discharge Voltage (As per JEDEC STD22- A114-B) 2 KV
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
device reliability.
Operating Conditions
Parameter
Supply Voltage
Ambient Operating
Temperature Range
Crystal Resonator Frequency
Output Driver Load Capacitance
Symbol
VDD
TA
FXIN
CL
Condition / Description
2.5V ± 5%
Min Typ
2.375 2.5
-40 -
25
--
Max
2.625
+85
15
Unit
V
°C
MHz
pF
Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
25MHz
Frequency tolerance
±50ppm or better at 25°C
Operating temperature range
-25°C to +85°C
Storage temperature
-40°C to +85°C
Load capacitance
18pF
Shunt capacitance
7pF maximum
ESR
25
Note: CY is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency.
Typical Crystal Interface Circuit
R
Crystal
XIN
CY
CY = 2*(CP – CS),
Where CP = Load capacitance of crystal from crystal vendor datasheet
CS = Stray capacitance due to CIN, PCB, Trace etc.
Rx
XOUT
CY
Rev. 2 | Page 3 of 7 | www.onsemi.com





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