P2041A-08TR [ALSC]
Versatile EMI Reduction IC; 多才多艺的EMI降低IC
| 型号： | P2041A-08TR |
| 厂家： | 
ALLIANCE SEMICONDUCTOR CORPORATION |
| 描述： | Versatile EMI Reduction IC |
| 文件： | 总9页 (文件大小：286K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2003
rev F
P2041A
Versatile EMI Reduction IC
Features
the clock source which provides system wide
reduction of EMI of all clock dependent signals. The
P2041 allows significant system cost savings by
reducing the number of circuit board layers and
shielding that are traditionally required to pass EMI
regulations.
FCC approved method of EMI attenuation
Provides up to 20 dB of EMI suppression
Generates a low EMI spread spectrum clock
of the input frequency
Optimized for 25 MHz to 60MHz input
frequency range
Internal loop filter minimizes external
components and board space
4 selectable spread ranges
The P2041 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
SSON control pin for spread spectrum
enable and disable options
The P2041 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”.
Characterizes to work with EMI-Lator®, EMC
simulation program.
Low cycle-to-cycle jitter
3.3 V or 5.0 V operating range
16 mA output drives
TTL or CMOS compatible outputs
Low power CMOS design
Available in 8 pin SOIC and TSSOP
Product Description
The P2041 is
Applications
a
selectable spread spectrum
The P2041 is targeted towards the embedded
controller market and PC peripheral markets
including scanners, MFP’s, printers, PDA, IA , and
GPS devices.
frequency modulator designed specifically for PC
peripheral and embedded controller markets .The
P2041 reduces electromagnetic interference (EMI) at
Block Diagram
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.
November 2003
rev F
P2041A
Pin Configuration
Pin Description
Pin#
1
2
Pin Name
XIN/CLK
Type
Description
I
Connect to crystal or externally generated clock signal.
XOUT
SR1
I
I
Connect to crystal. No connect if externally generated clock signal is used.
Digital logic input used to select Spreading Range (see Table 1). This pin
3
4
has an internal pull-up resistor.
VSS
SSON
P
I
Ground Connection. Connect to system ground.
Digital logic input used to enable Spread Spectrum function (Active Low).
Spread Spectrum function enable when low. This pin has an internal pull-
low resistor.
5
6
7
8
ModOUT
SR0
O
I
Spread Spectrum Clock Output.
Digital logic input used to select Spreading Range (see Table 1). This pin
has an internal pull-up resistor.
VDD
P
Connect to +3.3V or +5.0V
Table 1 - Spread Range Selection
FS0
SR0 Spreading Range
Input Frequency
Modulation rate
0
0
1
1
0
1
0
1
+/- 1.50%
+/- 2.50%
+/- 0.50%
+/- 1.00%
(Fin/40)*34.72 KHz
(Fin/40)*34.72 KHz
(Fin/40)*34.72 KHz**
(Fin/40)*34.72 KHz**
0
0
1
1
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 9
November 2003
P2041A
rev F
Spread spectrum selection
Table 1 illustrates the possible spread spectrum options. The optimal setting should minimize system EMI to the
fullest without affecting system performance. The spreading is described as a percentage deviation of the center
frequency (Note: the center frequency is the frequency of the external reference input on CLKIN, Pin 1).
Example of a typical printer or scanner application that operates on a clock frequency of 40 MHz:
A spreading selection of SR1=1 and SR0=1 provides a percentage deviation of +/-1.00%* (see Table 1) of Fcen.
This results in the frequency on ModOUT being swept from 40.40 MHz to 39.60 MHz at a modulation rate of
40/40*34.72=34.72 KHz (see Table 1). This particular example (see Figure below) given here is a common EMI
reduction method for scanners and has already been implemented by most of the leading manufacturers.
NOTE: Spreading range selection varies from different system manufacturers and their designs. The spreading range of P2041 can be set
to +/-2.5% when working with certain scanner model.
P2041 Application Schematic for Flat-Bed Scanner
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
3 of 9
November 2003
P2041A
rev F
EMC Software Simulation
By using Alliance Semiconductor’s proprietary EMC simulation software – EMI-lator®, radiated system level EMI
analysis can be made easier to allow a quantitative assessment on Alliance’s EMI reduction products. The
simulation engine of this EMC software has already been characterized to correlate with the electrical
characteristics of Alliance EMI reduction IC’s. The figure below is an example of the simulation result. Please
visit our web site at www.alsc.comfor information on how to obtain a free copy and demonstration of EMI-lator®.
Simulation Result from EMI-lator®
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
4 of 9
November 2003
P2041A
rev F
Absolute Maximum Ratings
Symbol
VDD, VIN
TSTG
Parameter
Voltage on any pin with respect to GND
Storage temperature
Rating
-0.5 to + 7.0
-65 to +125
0 to +70
Unit
V
°C
°C
TA
Operating temperature
DC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VIL
Input Low Voltage
GND – 0.3
0.8
V
-
VIH
IIL
Input High Voltage
2.0
VDD + 0.3
V
-
-
Input Low Current (pull-up resistor on inputs SR0, 1)
Input High Current (pull-down resistor on input SSON)
-
-
-35
35
-
µA
µA
mA
mA
V
IIH
-
3
IXOL
IXOH
VOL
VOH
IDD
-
XOUT Output Low Current (@ 0.4V, VDD = 3.3V)
XOUT Output High Current (@ 2.5V, VDD = 3.3V)
Output Low Voltage (VDD=3.3V, IOL = 20 mA)
-
3
-
-
-
0.4
-
2.5
-
-
V
Output High Voltage (VDD=3.3V, IOH = 20 mA)
Static Supply Current
0.6
8.6
-
mA
mA
ICC
Dynamic Supply Current (3.3V and 15 pF loading)
Operating Voltage
7
10
VDD
2.7
3.3
5.5
V
AC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
25
40
0.9
0.8
60
MHz
fIN
Input Frequency when
0.7
0.6
1.1
1.0
ns
Output rise time
tLH*
tHL*
(Measured at 0.8V to 2.0V)
Output fall time
ns
(Measured at 0.8V to 2.0V)
360
55
tJC
tD
Jitter (cycle to cycle)
Output duty cycle
-
45
-
50
ps
%
*tLH and tHL are measured into a capacitive load of 15pF
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
5 of 9
November 2003
P2041A
rev F
Package Information
Mechanical Package Outline 8-Pin SOIC
Dimensions in inches
Dimensions in millimeters
Symbol
Min
Nor
0.064
0.007
0.061
0.016
0.006
0.194
0.156
0.050 BSC
0.236
0.020
5°
Max
0.071
0.010
0.069
0.020
0.01
Min
1.45
0.10
1.35
0.31
0.10
4.72
3.75
Nor
1.63
Max
1.80
0.25
1.75
0.51
0.25
5.12
4.15
A
A1
A2
B
0.057
0.004
0.053
0.012
0.004
0.186
0.148
0.18
1.55
0.41
C
D
E
0.15
0.202
0.164
4.92
3.95
e
1.27 BSC
6.00
H
L
0.224
0.012
0°
0.248
0.028
8°
5.70
0.30
0°
6.30
0.70
8°
0.50
a
5°
Note: Controlling dimensions are millimeters
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
6 of 9
November 2003
rev F
P2041A
Mechanical Package Outline 8-Pin TSSOP
Dimensions in inches
Dimensions in millimeters
Symbol
Min
Nor
Max
Min
Nor
Max
1.10
0.15
1.05
0.30
0.20
3.10
4.50
A
A1
A2
B
0.047
0.006
0.041
0.012
0.008
0.122
0.177
0.002
0.031
0.007
0.004
0.114
0.169
0.05
0.80
0.19
0.09
2.90
4.30
0.039
1.00
C
D
E
0.118
0.173
3.00
4.40
e
0.026 BSC
0.252
0.65 BSC
6.40
H
L
0.244
0.018
0°
0.260
0.030
8°
6.20
0.45
0°
6.60
0.75
8°
0.024
0.60
5°
5°
a
Note: Controlling dimensions are millimeters
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
7 of 9
November 2003
P2041A
rev F
Ordering Codes
Temperature
Part Number
Marking
Package Type
Qty per reel
(°C)
P2041A-08ST
P2041A-08SR
P2041A-08TT
P2041A-08TR
P2041A
P2041A
P2041A
P2041A
8 PIN SOIC, TUBE
8 PIN SOIC, TAPE & REEL
8 PIN TSSOP, TUBE
0 TO 70
2,500
2,500
0 TO 70
0 TO 70
0 TO 70
8 PIN TSSOP, TAPE & REEL
Licensed under US patent Nos 5,488,627 and 5,631,920.
Preliminary datasheet. Specification subject to change without notice.
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
8 of 9
November 2003
rev F
P2041A
Alliance Semiconductor Corporation
2595, Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: P2041A
Document Version: F
Fax: 408-855-4999
www.alsc.com
© 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.
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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