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部品番号 ASM3P2107A
部品説明 Peak EMI Reducing Solution
メーカ Alliance Semiconductor Corporation
ロゴ Alliance Semiconductor Corporation ロゴ 
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ASM3P2107A Datasheet, ASM3P2107A PDF,ピン配置, 機能
July 2005
ASM3P2107A
wrewvw.D0a.3taSheet4U.com
Peak EMI Reducing Solution
Features
ƒ FCC approved method of EMI attenuation.
ƒ Generates a 1X low EMI spread spectrum clock of
the input frequency.
ƒ Input frequency range: 12MHz to 22MHz.
ƒ Internal loop filter minimizes external components
and board space.
ƒ Frequency deviation: - 0.8%( Typ) @20MHz.
ƒ Low cycle-to-cycle jitter.
ƒ 5.0V ± 5% operating voltage range.
ƒ TTL or CMOS compatible outputs.
ƒ Available in 8-pin SOIC and TSSOP Packages.
Product Description
The ASM3P2107A is a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies from 12MHz to 22MHz. The ASM3P2107A
can generate an EMI reduced clock from crystal, ceramic
resonator, or system clock.
The ASM3P2107A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent
signals. The ASM3P2107A allows significant system cost
savings by reducing the number of circuit board layers
ferrite beads, shielding and other passive components
that are traditionally required to pass EMI regulations.
The ASM3P2107A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The ASM3P2107A 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 ASM3P2107A is targeted towards EMI management
for high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
VDD
XIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
CLOCKOUT
GND
Alliance Semiconductor
2575 Augustine Drive Santa Clara, CA Tel: 408.855.4900 Fax: 408.855.4999 www.alsc.com
Notice: The information in this document is subject to change without notice.

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ASM3P2107A pdf, 電子部品, 半導体, ピン配列
July 2005
ASM3P2107A
wrewvw.D0a.3taSheet4U.com
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VDD, VIN
TSTG
TA
Ts
TJ
Voltage on any pin with respect to Ground
Storage temperature
Operating temperature
Max. Soldering Temperature (10 sec)
Junction Temperature
-0.5 to +7.0
-65 to +125
0 to 70
260
150
V
°C
°C
°C
°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.
DC Electrical Characteristics
Symbol
VIL
VIH
IIL
IIH
IXOL
IXOH
VOL
VOH
ICC
IDD
VDD
tON
ZOUT
Parameter
Input low voltage
Input high voltage
Input low current
Input high current
XOUT output low current (@ 0.4, VDD = 5V)
XOUT output high current (@2.5V, VDD = 5V)
Output low voltage (VDD = 5V, IOL = 20mA)
Output high voltage (VDD = 5V, IOH = 20mA)
Dynamic supply current normal mode
(5V, 18MHz and 15pF loading)
Static supply current standby mode
Operating voltage
Power up time (first locked clock cycle after power up)
Clock out impedance
Min Typ Max Unit
GND – 0.3
-
0.8 V
2.0 - VDD + 0.3 V
- 44 - µA
- 66 - µA
- 3 - mA
- 3 - mA
- - 0.4 V
2.5 - - V
- 40 - mA
- 40 - µA
4.75 5.0 5.25 V
-
0.18 -
mS
- 50 -
AC Electrical Characteristics
Symbol
Parameter
fIN
MODOUT
fd
tLH*
tHL*
tJC
tD
Input frequency
Output frequency
Frequency Deviation
Input Frequency =12MHz
Input Frequency =22MHz
Output rise time (measured at 0.8V to 2.0V)
Output fall time (measured at 2.0V to 0.8V)
Jitter (cycle to cycle)
Output duty cycle
* VDD = +5V, Input Frequency = 18MHz, tLH and tHL are measured into a capacitive load of 15pF
Min
12
12
-
-
-
-
-
45
Typ
-
-
-2.13
-0.62
440
300
-
50
Max
22
22
-
-
-
-
360
55
Unit
MHz
MHz
%
pS
pS
pS
%
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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