P2041A [PULSECORE]
Versatile EMI Reduction IC; 多才多艺的EMI降低IC
| 型号： | P2041A |
| 厂家： | 
PulseCore Semiconductor |
| 描述： | Versatile EMI Reduction IC |
| 文件： | 总8页 (文件大小：179K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2006
rev 0.2
P2041A
Versatile EMI Reduction IC
Features
which provides system wide reduction of EMI of all clock
dependent signals. The P2041A 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 20dB of EMI suppression
Generates a low EMI spread spectrum clock of the
input frequency
Optimized for 25MHz to 60MHz input frequency
range
Internal loop filter minimizes external components
and board space
The P2041A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
4 selectable spread ranges
SSON control pin for spread spectrum enable and
disable options
Low Cycle-to-cycle jitter
3.3V or 5.0V operating voltage
Low power CMOS design
The P2041A 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 result 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”.
Available in 8 pin SOIC and TSSOP Packages
Product Description
Applications
The P2041A is a selectable spread spectrum frequency
modulator designed specifically for PC peripheral and
embedded controller markets. The P2041A reduces
electromagnetic interference (EMI) at the clock source
The P2041A is targeted towards the embedded controller
market and PC peripheral markets including scanners,
MFP’s, printers, PDA, IA , and GPS devices.
Block Diagram
VDD
SSON
SR1
SR0
PLL
Modulation
XIN
Frequency
Divider
Crystal
Oscillator
XOUT
Output
Divider
Phase
Loop
Filter
VCO
Detector
Feedback
Divider
ModOUT
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
November 2006
P2041A
rev 0.2
Pin Configuration
8
1
XIN/CLK
XOUT
2
7
SR0
P2041A
6
3
4
ModOUT
5
SSON
Pin Description
Pin#
Pin Name
Type
Description
1
XIN/CLK
I
Connect to crystal or externally generated clock signal.
2
XOUT
I
Connect to crystal. No connect if externally generated clock signal is used.
Digital logic input used to select Spreading Range (see Table 1).
3
4
5
6
7
8
SR1
VSS
I
P
I
This pin has an internal pull-up resistor.
Ground Connection. Connect to system ground.
Digital logic input used to enable Spread Spectrum function (Active Low). Spread
SSON
ModOUT
SR0
Spectrum function enable when low. This pin has an internal pull-low resistor.
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
Spread Range Selection
SR1
SR0
Spreading Range
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
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Notice: The information in this document is subject to change without notice.
November 2006
P2041A
rev 0.2
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 XIN/CLK, Pin 1).
Example of a typical printer or scanner application that operates on a clock frequency of 40MHz:
A spreading selection of SR1=1 and SR0=1 provides a percentage deviation of +/-1.00%* (see Table 1) of Center
Frequency. This results in the frequency on ModOUT being swept from 40.40MHz to 39.60MHz at a modulation rate of
(40/40)*34.72 = 34.72KHz (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 P2041A can be set to +/-2.5% when
working with certain scanner model.
P2041A Application Schematic for Flat-Bed Scanner
VDD
40MHz
XIN/CLK
XOUT
VDD
SR0
1
2
3
4
8
7
6
5
0.1µF
SR1
VSS
ModOUT
Modulated 40MHz signal with ± 1.00%
Deviation and modulation rate of
34.72KHz. This signal is connected back
to the clock crystal Input pin of the
system ASIC.
SSON
P2041A
NOTE: The above schematic indicates
The exact setting of this example:
Default setting (no connection on pin 3,
7 and 5)
Absolute Maximum Ratings
Symbol
Parameter
Rating
-0.5 to +7.0
-65 to +125
-40 to +85
260
Unit
V
°C
°C
°C
°C
VDD, VIN
Voltage on any pin with respect to Ground
TSTG
TA
Storage temperature
Operating temperature
Ts
TJ
Max. Soldering Temperature (10 sec)
Junction Temperature
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.
Versatile EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 0.2
P2041A
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)
Symbol
Parameter
Min
Typ
Max
Unit
( For 3.3V Supply Voltage)
VSS –0.3
-
0.8
VIL
Input low Voltage
Input low Voltage
V
( For 5V Supply Voltage)
( For 3.3V Supply Voltage)
( For 5V Supply Voltage)
( For 3.3V Supply Voltage)
( For 5V Supply Voltage)
( For 3.3V Supply Voltage)
( For 5V Supply Voltage)
-
-
1.5
2.0
-
VDD + 0.3
VIH
IIL
V
3.5
-
-
-35
-100
35
100
-
Input Low Current
(pull-up resistor on inputs
SR0, SR1)
Input High Current
(pull-down resistor on input
SSON )
-
-
µA
µA
-
-
-
-
IIH
-
-
3
IXOL
IXOH
XOUT Output Low Current (VXOL @ 0.4V, VDD = 3.3V)
XOUT Output High Current ( VXOH@ 2.5V, VDD = 3.3V)
-
mA
mA
-
3
-
(VDD=3.3V, IOL = 20 mA)
Output Low Voltage
-
-
-
0.4
0.5
-
VOL
V
(VDD=5V, IOL = 20 mA)
-
(VDD=3.3V, IOH = 20 mA)
Output High Voltage
2.5
4.5
-
-
VOH
IDD
V
mA
mA
V
(VDD=5V, IOH = 20 mA)
-
-
Static Supply Current
1.0
-
-
3.3V and 15pF loading
-
22
35
5.5
ICC
Dynamic Supply Current
5V and 15pF loading
-
-
VDD
Operating Voltage
2.7
3.3
AC Electrical Characteristics
Symbol
Parameter
Min
25
Typ
40
Max
60
Unit
MHz
nS
fIN
Input Frequency
Output rise time
tLH*
0.7
1.0
1.3
( Measured at 0.8V to 2.0V )
Output fall time
tHL*
0.6
0.8
1.0
nS
( Measured at 2.0 to 0.8V )
tJC
tD
Jitter (Cycle to cycle)
Output duty cycle
-
45
360
50
-
55
pS
%
*tLH and tHL are measured into a capacitive load of 15pF
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Notice: The information in this document is subject to change without notice.
November 2006
P2041A
rev 0.2
Package Information
8-lead (150-mil) 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
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Notice: The information in this document is subject to change without notice.
November 2006
rev 0.2
P2041A
8-lead TSSOP (4.40-MM Body)
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Millimeters
Min
Max
Min
Max
A
A1
A2
B
0.043
0.006
0.037
0.012
0.008
0.122
0.177
1.10
0.002
0.033
0.008
0.004
0.114
0.169
0.05
0.85
0.19
0.09
2.90
4.30
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
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Notice: The information in this document is subject to change without notice.
November 2006
P2041A
rev 0.2
Ordering Information
Part number
Marking
Package Configuration
Temperature Range
P2041AF-08ST
P2041AF-08SR
P2041AF-08TT
P2041AF-08TR
P2041AG-08ST
P2041AG-08SR
P2041AG-08TT
P2041AG-08TR
I2041AF-08ST
I2041AF-08SR
I2041AF-08TT
I2041AF-08TR
I2041AG-08ST
I2041AG-08SR
I2041AG-08TT
I2041AG-08TR
P2041AF
8-Pin SOIC, Tube, Pb Free
8-Pin SOIC, Tape and Reel, Pb Free
8-Pin TSSOP, Tube, Pb Free
8-Pin TSSOP, Tape and Reel, Pb Free
8-Pin SOIC, Tube, Green
8-Pin SOIC, Tape and Reel, Green
8-Pin TSSOP, Tube, Green
8-Pin TSSOP, Tape and Reel, Green
8-Pin SOIC, Tube, Pb Free
8-Pin SOIC, Tape and Reel, Pb Free
8-Pin TSSOP, Tube, Pb Free
8-Pin TSSOP, Tape and Reel, Pb Free
8-Pin SOIC, Tube, Green
8-Pin SOIC, Tape and Reel, Green
8-Pin TSSOP, Tube, Green
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Industrial
Industrial
Industrial
Industrial
Industrial
P2041AF
P2041AF
P2041AF
P2041AG
P2041AG
P2041AG
P2041AG
I2041AF
I2041AF
I2041AF
I2041AF
I2041AG
I2041AG
I2041AG
I2041AG
Industrial
Industrial
Industrial
8-Pin TSSOP, Tape and Reel, Green
Device Ordering Information
P 2 0 4 1 A F - 0 8 S T
SR - SOIC, T/R
TT – TSSOP, TUBE
TR - TSSOP, T/R
ST – SOIC, TUBE
PIN COUNT
F =Lead Free and and RoHS compliant part
G = GREEN PACKAGE, LEAD FREE, and RoHS
P = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (-40°C to 85°C)
Licensed under US patent Nos 5,488,627 and 5,631,920.
Versatile EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 0.2
P2041A
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Copyright © PulseCore Semiconductor
All Rights Reserved
Part Number: P2041A
Document Version: 0.2
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or
registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their
respective companies. PulseCore reserves the right to make changes to this document and its products at any time without
notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein
represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore 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. PulseCore 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 PulseCore 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 PulseCore’s Terms and Conditions of Sale (which are available from
PulseCore). All sales of PulseCore products are made exclusively according to PulseCore’s Terms and Conditions of Sale.
The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights,
trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore 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 PulseCore products in such life-supporting systems implies that the
manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use.
Versatile EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
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