P2041A-08TR [ALSC]

Versatile EMI Reduction IC; 多才多艺的EMI降低IC
P2041A-08TR
型号: P2041A-08TR
厂家: ALLIANCE SEMICONDUCTOR CORPORATION    ALLIANCE SEMICONDUCTOR CORPORATION
描述:

Versatile EMI Reduction IC
多才多艺的EMI降低IC

晶体 时钟发生器 微控制器和处理器 外围集成电路 光电二极管
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.  
ƒ
ƒ
ƒ
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  
ƒ
ƒ
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.  
ƒ
ƒ
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”.  
ƒ
Characterizes to work with EMI-Lator®, EMC  
simulation program.  
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
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.  
9 of 9  

相关型号:

P2041A-08TT

Versatile EMI Reduction IC
ALSC

P2041A-8ST

40.4MHz, OTHER CLOCK GENERATOR, PDSO8, 0.150 INCH, SOIC-8
PULSECORE

P2041A-8TR

Clock Generator, 40.4MHz, CMOS, PDSO8, 4.40 MM, TSSOP-8
ALSC

P2041A-8TT

Clock Generator, 40.4MHz, CMOS, PDSO8, 4.40 MM, TSSOP-8
PULSECORE

P2041AF-08SR

Versatile EMI Reduction IC
PULSECORE

P2041AF-08ST

Versatile EMI Reduction IC
PULSECORE

P2041AF-08TR

Versatile EMI Reduction IC
PULSECORE

P2041AF-08TT

Versatile EMI Reduction IC
PULSECORE

P2041AF-8SR

40.4MHz, OTHER CLOCK GENERATOR, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8
PULSECORE

P2041AG-08SR

Versatile EMI Reduction IC
PULSECORE

P2041AG-08ST

Versatile EMI Reduction IC
PULSECORE

P2041AG-08TR

Versatile EMI Reduction IC
PULSECORE