概述
数据手册ASM3P2108A 概述
Peak EMI Reducing Solution 峰值EMI降低解决方案
ASM3P2108A 数据手册
通过下载ASM3P2108A数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载July 2005
rev 0.3
ASM3P2108A
Peak EMI Reducing Solution
Features
savings by reducing the number of circuit board layers
ferrite beads, shielding and other passive components
that are traditionally required to pass EMI regulations.
FCC approved method of EMI attenuation.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
The ASM3P2108A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Input frequency range: 25MHz to 45MHz.
Internal loop filter minimizes external components
and board space.
Frequency deviation: - 1.3%( Typ) @32MHz.
Low cycle-to-cycle jitter.
5.0V ± 5% operating voltage range.
TTL or CMOS compatible outputs.
Available in 8-pin SOIC and TSSOP Packages.
The ASM3P2108A 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’.
Product Description
The ASM3P2108A is
a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies from 25MHz to 45MHz. The ASM3P2108A
can generate an EMI reduced clock from crystal, ceramic
resonator, or system clock.
Applications
The ASM3P2108A is targeted towards EMI management
for high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
The ASM3P2108A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent
signals. The ASM3P2108A allows significant system cost
Block Diagram
VDD
PLL
Modulation
XIN
Crystal
Frequency
Divider
Oscillator
Output
Phase
Loop
Filter
VCO
XOUT
Divider
Detector
Feedback
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.
July 2005
rev 0.3
ASM3P2108A
Pin Configuration
XIN / CLKIN
XOUT
GND
1
2
3
4
8
7
6
5
NC
NC
ASM3P2108A
VDD
CLOCKOUT
NC
Pin Description
Pin# Pin Name
Type
Description
Crystal connection or external reference frequency input. This pin has dual functions. It
1
XIN/CLKIN
I
can be connected to either an external crystal or an external reference clock.
2
3
4
5
6
7
8
XOUT
GND
O
P
-
Crystal connection. If using an external reference, this pin must be left unconnected.
Ground to entire chip.
No connect.
NC
CLOCKOUT
VDD
O
P
-
Spread spectrum low EMI output.
Power supply for the entire chip (5V).
No connect.
NC
NC
-
No connect.
Peak EMI Reducing Solution
2 of 7
Notice: The information in this document is subject to change without notice.
July 2005
ASM3P2108A
rev 0.3
Absolute Maximum Ratings
Symbol
Parameter
Rating
-0.5 to +7.0
-65 to +125
0 to 70
Unit
V
°C
°C
°C
°C
Voltage on any pin with respect to Ground
Storage temperature
Operating temperature
VDD, VIN
TSTG
TA
Max. Soldering Temperature (10 sec)
Junction Temperature
Ts
TJ
260
150
Static Discharge Voltage
TDV
2
KV
(As per JEDEC STD22- A114-B)
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
Parameter
Min
GND – 0.3
Typ
-
-
44
66
3
3
-
Max
0.8
VDD + 0.3
Unit
V
V
µA
µA
mA
mA
V
Input low voltage
Input high voltage
Input low current
Input high current
VIH
IIL
IIH
IXOL
IXOH
VOL
VOH
2.0
-
-
-
-
-
-
-
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)
-
-
0.4
-
2.5
-
V
Dynamic supply current normal mode
ICC
-
40
-
mA
(5V, 32MHz and 15pF loading)
IDD
VDD
tON
Static supply current standby mode
Operating voltage
Power up time (first locked clock cycle after power up)
Clock out impedance
-
40
5.0
0.18
50
-
µA
V
mS
Ω
4.75
-
-
5.25
-
-
ZOUT
AC Electrical Characteristics
Symbol
Parameter
Min
25
Typ
-
Max
45
Unit
MHz
fIN
Input frequency
MODOUT
Output frequency
25
-
45
MHz
Input Frequency =25MHz
Input Frequency =45MHz
-
-
-1.98
-0.60
-
-
fd
Frequency Deviation
%
tLH*
tHL*
tJC
Output rise time (measured at 0.8V to 2.0V)
Output fall time (measured at 2.0V to 0.8V)
Jitter (cycle to cycle)
-
-
-
440
300
-
-
-
pS
pS
pS
%
360
55
tD
Output duty cycle
45
50
* VDD = +5V, Input Frequency = 32MHz, tLH and tHL are measured into a capacitive load of 15pF
Peak EMI Reducing Solution
3 of 7
Notice: The information in this document is subject to change without notice.
July 2005
ASM3P2108A
rev 0.3
Package Information
8-Pin SOIC Package
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Millimeters
Min
Max
0.010
0.069
0.059
0.020
0.010
Min
0.10
1.35
1.25
0.31
0.18
Max
0.25
1.75
1.50
0.51
0.25
A1
A
0.004
0.053
0.049
0.012
0.007
A2
B
C
D
E
0.193 BSC
0.154 BSC
0.050 BSC
0.236 BSC
4.90 BSC
3.91 BSC
1.27 BSC
6.00 BSC
e
H
L
0.016
0°
0.050
8°
0.41
0°
1.27
8°
θ
Peak EMI Reducing Solution
4 of 7
Notice: The information in this document is subject to change without notice.
July 2005
rev 0.3
ASM3P2108A
8-Pin TSSOP Package
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Inches
Symbol
Millimeters
Min
Max
Min
Max
A
A1
A2
B
……
0.043
…..
0.05
0.85
0.19
0.09
2.90
4.30
1.10
0.002
0.033
0.008
0.004
0.114
0.169
0.006
0.037
0.012
0.008
0.122
0.177
0.15
0.95
0.30
0.20
3.10
4.50
c
D
E
e
0.026 BSC
0.252 BSC
0.65 BSC
6.40 BSC
H
L
0.020
0°
0.028
8°
0.50
0°
0.70
8°
θ
Peak EMI Reducing Solution
5 of 7
Notice: The information in this document is subject to change without notice.
July 2005
ASM3P2108A
rev 0.3
Ordering Codes
Marking
3P2108AF
Part Number
Package
8-PIN SOIC, TAPE AND REEL, Pb Free
8-PIN SOIC, TUBE, Pb Free
Temperature
Commercial
Commercial
ASM3P2108AF-08-SR
ASM3P2108AF-08-ST
ASM3P2108AF-08-TR
ASM3P2108AF-08-TT
ASM3P2108AG-08-SR
ASM3P2108AG-08-ST
ASM3P2108AG-08-TR
ASM3P2108AG-08-TT
ASM3P2108A-08-SR
ASM3P2108A-08-ST
ASM3P2108A-08-TR
ASM3P2108A-08-TT
3P2108AF
3P2108AF
3P2108AF
3P2108AG
3P2108AG
3P2108AG
3P2108AG
3P2108A
8-PIN TSSOP, TAPE AND REEL, Pb Free
8-PIN TSSOP, TUBE, Pb Free
8-PIN SOIC, TAPE AND REEL, Green
8-PIN SOIC, TUBE, Green
8-PIN TSSOP, TAPE AND REEL, Green
8-PIN TSSOP, TUBE, Green
8-PIN SOIC, TAPE AND REEL
8-PIN SOIC, TUBE
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
3P2108A
3P2108A
3P2108A
8-PIN TSSOP, TAPE AND REEL
8-PIN TSSOP, TUBE
Device Ordering Information
A S M 3 P 2 1 0 8 A G - 0 8 - S T
R = Tape & reel, T = Tube or Tray
O = SOT
U = MSOP
S = SOIC
T = TSSOP
A = SSOP
V = TVSOP
B = BGA
E = TQFP
L = LQFP
U = MSOP
P = PDIP
D = QSOP
X = SC-70
Q = QFN
DEVICE PIN COUNT
F = LEAD FREE AND RoHS COMPLIANT PART
G = GREEN PACKAGE
PART NUMBER
X= Automotive
I= Industrial
P or n/c = Commercial
(0C to +70C)
(-40C to +125C) (-40C to +85C)
1 = Reserved
6 = Power Management
7 = Power Management
8 = Power Management
9 = Hi Performance
2 = Non PLL based
3 = EMI Reduction
4 = DDR support products
ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Peak EMI Reducing Solution
6 of 7
Notice: The information in this document is subject to change without notice.
July 2005
rev 0.3
ASM3P2108A
Copyright © Alliance Semiconductor
Alliance Semiconductor Corporation
2575 Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
All Rights Reserved
Preliminary Information
Part Number: ASM3P2108A
Document Version: v0.3
Fax: 408-855-4999
www.alsc.com
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are
trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their
respective companies. Alliance reserves the right to make changes to this document and its products at any time without
notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein
represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this
data at any time, without notice. If the product described herein is under development, significant changes to these
specifications are possible. The information in this product data sheet is intended to be general descriptive information for
potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or
customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product
described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products
including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual
property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance).
All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of
products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any
other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical
components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant
injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer
assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
Peak EMI Reducing Solution
7 of 7
Notice: The information in this document is subject to change without notice.
ASM3P2108A 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| ASM3P2108A-08-SR | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108A-08-ST | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108A-08-TR | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108A-08-TT | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108AF-08-SR | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108AF-08-SR | PULSECORE | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108AF-08-ST | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108AF-08-ST | PULSECORE | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108AF-08-TR | ALSC | Peak EMI Reducing Solution | 获取价格 |
|
| ASM3P2108AF-08-TR | PULSECORE | Peak EMI Reducing Solution | 获取价格 |
|
ASM3P2108A 相关文章
Bourns 密封通孔金属陶瓷微调电位计产品选型手册(英文版)
- 2024-09-20
- 6
Bourns 精密环境传感器产品选型手册(英文版)
- 2024-09-20
- 9
Bourns POWrTher 负温度系数(NTC)热敏电阻手册 (英文版)
- 2024-09-20
- 8
Bourns GMOV 混合过压保护组件产品选型手册(英文版)
- 2024-09-20
- 6
