P2782AG-08TT [PULSECORE]
General Purpose EMI Reduction IC; 通用EMI降低IC
| 型号： | P2782AG-08TT |
| 厂家： | 
PulseCore Semiconductor |
| 描述： | General Purpose EMI Reduction IC |
| 文件： | 总11页 (文件大小：180K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
October 2006
rev 1.6
P2781/82/84
General Purpose EMI Reduction IC
Features
reduces electromagnetic interference (EMI) at the clock
source, which provides system wide reduction of EMI of
all clock dependent signals. The P278xA allows
significant system cost savings by reducing the number of
circuit board layers and shielding that are traditionally
required to pass EMI regulations.
•
•
•
Provides up to 15dB of EMI suppression
FCC approved method of EMI attenuation
Generates a 1X, 2X, and 4X low EMI spread
spectrum clock of the input frequency
Input frequency range from 3 to 78MHz
External loop filter for spread % adjustment
Spreading ranges from ±0.25% to ±5.0%
Ultra low cycle-to-cycle jitter
Zero-cycle slip
3.3V operating voltage range
Ultra-low power CMOS design
P278xA is available in 8 pin SOIC and TSSOP
Packages
•
•
•
•
•
•
•
•
The P278xA uses the most efficient and optimized
modulation profile approved by the FCC. The P278xA
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 for industrial and automotive
temperature ranges.
Product Description
Applications
The P278xA is a versatile spread spectrum frequency
modulator designed specifically for digital camera and
other digital video and imaging applications. The P278xA
The P278xA is targeted towards MFP, xDSL, fax modem,
set-top box, USB controller, DSC, and embedded systems.
Block Diagram
FS0
FS1
LF
VDD
PLL
XIN /CLKIN
XOUT
Frequency
Divider
Crystal
Output
Divider
Oscillator
Phase
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.
October 2006
rev 1.6
P2781/82/84
Pin Configuration
1
2
3
4
8
7
6
5
XIN / CLKIN
XOUT
VDD
FS0
P278xA
ModOUT
VSS
FS1
LF
Standard pin Configuration offered in both
8 pin SOIC and TSSOP Packages
Pin Description (P278xA)
Pin#
Pin Name
Type
Description
Connect to crystal or clock input. This pin has dual functions. It can be connected
either to an external crystal or an external reference clock.
Crystal connection. If using an external reference, this pin must be left
unconnected.
1
XIN/CLKIN
I
2
3
XOUT
FS1
O
I
Digital logic input used to select input frequency range
(see the Input Frequency Selection Table). This pin has an internal pull-up
resistor.
External Loop Filter for the PLL. By changing the value of the CRC circuit, the
percentage spread can be adjusted accordingly. See the Loop Filter Selection
Table for detail value.
4
LF
I
5
6
VSS
I
Ground Connection. Connect to system ground.
ModOUT
O
Spread Spectrum Clock Output.
Digital logic input used to select input frequency range
(see the Input Frequency Selection Table). This pin has an internal pull-up
resistor.
7
8
FS0
I
VDD
P
Connect to +3.3 V
Input Frequency Selection Table
Output Frequency Scaling (MHz)
Modulation Rate (KHz)
FS1
FS0
Input (MHz)
P2781A
3 to 9
P2782A
6 to 18
P2784A
12 to 36
0
0
1
1
0
1
0
1
3 to 9
Fin / 128
Fin / 256
Fin / 512
Fin / 1024
10 to 19
20 to 38
39 to 78
10 to 19
20 to 38
39 to 78
20 to 38
40 to 76
78 to 156
40 to 76
80 to 152
156 to 312
General Purpose EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
Loop Filter Selection Table VDD 3.3V
Contact PulseCore for loop values that are not listed in the table and for
component selection values for industrial and automotive temperatures.
BW = ±0.50%1
C2
BW = ±0.75%1
C2
BW = ±1.00%1
C2
BW = ±1.25%1
C2 R1
Input
MHz
FS1 FS0
C1
(pF)
R1
C1
R1
C1
R1
C1
(pF)
(ohm) (pF)
(pF)
(ohm) (pF)
(pF)
(ohm)
(pF)
(pF)
(ohm)
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
270 330,000 220
270 100,000 270
270 100,000 390
270 100,000 510
270 100,000 620
270 100,000 820
270 330,000 300
270 100,000 390
270 100,000 560
270 100,000 750
270 100,000
270 100,000
270 100,000
390
560
560
560
560
680
330
680
270
560
100,000
100,000
100,000
6,800
510
4
680
5
750
910
6
270
10,000
5,600
1,000
1,200
2,200
2,200
750
1,200
1,200
2,200
2,200
910
7
270 100,000 1,000 270
270 100,000 1,200 270
3,300
8
12,000
5,600
6,800
2,700
9
270 100,000 1,000 270 100,000 1,500 270
10
270 100,000 330
270 100,000 390
270 100,000 510
270 100,000 560
270 100,000 620
270 100,000 750
270 100,000 820
270 100,000 910
270 100,000 510
270 100,000 560
270 100,000 750
270 100,000 820
270 100,000
100,000
100,000
6,800
11
270 100,000 866(1%) 560
1,100
1,200
1,200
1,200
1,500
2,200
2,200
2,200
2,700
910
1,100
1,200
1,200
1,200
1,500
2,200
2,200
2,200
2,700
910
1,100
1,200
1,200
1,200
1,500
2,200
2,200
2,200
2,700
12
270
270
10,000
12,000
5,600
1,000
1,200
1,200
1,200
2,200
2,200
2,200
2,200
750
680
470
330
330
680
390
270
270
560
13
4,700
14
270 100,000 1,000 270
270 100,000 1,100 270
270 100,000 1,200 270
270 100,000 1,300 270
3,300
15
3,900
3,300
16
12,000
10,000
5,600
6,800
17
3,900
18
270 100,000 1,000 270 100,000 1,500 270
270 100,000 1,200 270 100,000 1,600 270
2,700
19
3,300
2,700
20
270 100,000 330
270 100,000 390
270 100,000 510
270 100,000 560
270 100,000 620
270 100,000 750
270 100,000 820
270 100,000 910
270 100,000 560
270 100,000 620
270 100,000 750
270 100,000 820
270 100,000 1,000 270
270 100,000 1,100 270
270 100,000 1,200 270
270 100,000 1,300 270
270 100,000
100,000
100,000
6,800
21-22
23-24
25-26
27-28
29-30
31-32
33-34
35-36
37-38
39-42
43-46
47-50
51-54
55-58
59-62
63-66
67-70
71-74
75-78
270 100,000 866 (1%) 560
270
270
10,000
12,000
6,800
1,000
1,200
1,200
1,200
2,200
2,200
2,200
2,200
750
680
470
330
330
680
390
270
270
560
4,700
3,300
3,900
3,300
12,000
10,000
5,600
6,800
3,900
270 100,000 1,000 270 100,000 1,500 270
270 100,000 1,200 270 100,000 1,600 270
2,700
3,300
2,700
270 100,000 330
270 100,000 390
270 100,000 510
270 100,000 560
270 100,000 620
270 100,000 750
270 100,000 820
270 100,000 910
270 100,000 560
270 100,000 620
270 100,000 750
270 100,000 820
270 100,000 1,000 270
270 100,000 1,100 270
270 100,000 1,200 270
270 100,000 1,300 270
270 100,000
100,000
100,000
6,800
270 100,000 866 (1%) 560
270
270
10,000
12,000
6,800
3,900
12,000
8,200
5,600
3,300
1,000
1,200
1,200
1,200
2,200
2,200
2,200
2,200
680
470
330
330
680
390
270
270
4,700
3,300
3,300
6,800
3,900
270 100,000 1,000 270 100,000 1,600 270
270 100,000 1,200 270 100,000 1,800 270
2,700
2,700
1 The BW value is representative of typical conditions
General Purpose EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
Spread Spectrum Selection
The P278xA performs Zero Cycle Slip when set at low percentage spreading. This allows no occurrence of system timing
error. 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.)
The P2781A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for
operation between 3 to 78MHz range. In the following application schematic example, the P2781A spread percentage
selection is determined by the external LF value specified in the Loop Filter Selection Table. The Input Frequency Selection
Table specifies the input frequency range. The external LF allows the user to fine tune the spread percentage to optimize the
EMI reduction benefits of the spread spectrum.
+3.3V
16 MHz
XIN/CLKIN VDD
1
2
3
4
8
7
6
5
0.1µF
2.2 K
XOUT
FS0
FS1
Modulated 16MHz Clock
To target Chip
ModOUT
LF
VSS
P278xA
R1
C1
0 Ohm
C2
Note: Both logic input pins FS1 and FS0 have to be connected to either VDD or VSS. Do not leave them floating.
General Purpose EMI Reduction IC
4 of 11
Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
Absolute Maximum Ratings
Symbol
Parameter
Voltage on any pin with respect to Ground
Rating
Unit
V
°C
°C
°C
°C
VDD, VIN
TSTG
TA
-0.5 to +4.6
-65 to +125
-40 to +85
260
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.
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)
Symbol
VIL
Parameter
Min
VSS – 0.3
2.0
Typ
-
-
Max
0.8
VDD +0.3
Unit
V
V
Input low voltage
Input high voltage
Input low current
VIH
IIL
-
-
60
60
-
-
µA
µA
(internal input pull-up resistor on FS0 and FS1)
Input high current
IIH
(internal input pull-up resistor on FS0 and FS1)
IXOL
IXOH
XOUT output low current
XOUT output high current
-
-
10
10
-
-
mA
mA
VOL
VOH
Output low voltage (VDD = 3.3V, IOL = 20mA)
-
-
-
0.4
V
Output high voltage (VDD = 3.3V, IOH = 20mA)
Static supply current
2.5
-
-
V
IDD
ICC
-
3
-
mA
Typical dynamic supply current
5.2 at 3MHz
3.0
21.2 at 82MHz mA
3.6
(25pF scope probe loading)
VDD
Operating voltage
3.3
V
General Purpose EMI Reduction IC
5 of 11
Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
AC Electrical Characteristics
Symbol
Parameter
Input frequency: P278xA
Min
3
Typ
Max
78
Unit
fIN
-
-
-
-
P2781A
P2782A
P2784A
3
78
MHz
fOUT
Output frequency:
6
156
312
12
Output rise time (measured at 0.8 V to 2.0 V,
25pF scope probe loading)
tLH
tHL
tJC
tD
P278xA
P278xA
P2781A
P2781A
-
1
-
nS
nS
pS
%
Output fall time (measured at 2.0 V to 0.8 V,
25 pF scope probe loading)
-
1
±250
-
-
Jitter (cycle to cycle, ± 6sigma, 1000 sweeps,
± 0.5% spread, I/O frequency = 16MHz)
-
-
Output duty cycle deviation (error from 50%
duty cycle, 25pF scope probe loading)
±1 @ 3MHz
±2 @ 82MHz
Frequency deviation tolerance from BW%
stated in the Loop Filter Selection Table
∆F
P278xA
-20
0
+20
%
General Purpose EMI Reduction IC
6 of 11
Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
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
Note: Controlling dimensions are millimeters
SOIC - 0.074 grams unit weight
General Purpose EMI Reduction IC
7 of 11
Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
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
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
0.05
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
Note: Controlling dimensions are millimeters
TSSOP - 0.0325 grams unit weight
General Purpose EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
Ordering Codes
Ordering #
P278xAF-08ST
P278xAF-08SR
P278xAF-08TT
P278xAF-08TR
P278xAG-08ST
P278xAG-08SR
P278xAG-08TT
P278xAG-08TR
I278xAF-08ST
I278xAF-08SR
I278xAF-08TT
I278xAF-08TR
I278xAG-08ST
I278xAG-08SR
I278xAG-08TT
I278xAG-08TR
X278xAF-08ST
X278xAF-08SR
X278xAF-08TT
X278xAF-08TR
X278xAG-08ST
X278xAG-08SR
X278xAG-08TT
Top Marking
P278xAF
P278xAF
P278xAF
P278xAF
P278xAG
P278xAG
P278xAG
P278xAG
I278xAF
Package Type
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
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
Temperature
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Automotive
Automotive
Automotive
Automotive
Automotive
Automotive
Automotive
Automotive
I278xAF
I278xAF
I278xAF
I278xAG
I278xAG
I278xAG
I278xAG
X278xAF
X278xAF
X278xAF
X278xAF
X278xAG
X278xAG
X278xAG
X278xAG
8 PIN SOIC, TAPE AND REEL, Green
8 PIN TSSOP, TUBE, Green
8 PIN TSSOP, TAPE AND REEL, Green
X278xAG-08TR
Note: x=1/2/4
General Purpose EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
Device Ordering Information
P 2 7 8 x A
F
0 8 X X
Package:
ST – SOIC, TUBE
SR - SOIC, T/R
TT – TSSOP, TUBE
TR - TSSOP, T/R
Pin Count
F = LEAD FREE or RoHS COMPLIANT PART
G = GREEN PACKAGE, LEAD FREE, and RoHS
DEVICE NUMBER
Flow:
P = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (-40°C to 85°C)
X = Automotive Temperature Range (-40°C to +125°C)
Note: x=1/2/4
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920
General Purpose EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
October 2006
rev 1.6
P2781/82/84
Copyright © PulseCore Semiconductor
PulseCore Semiconductor Corporation
1715 S. Bascom Avenue Suite 200,
Campbell, CA 95008
All Rights Reserved
Part Number: P2781/82/84
Document Version: 1.6
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.
General Purpose EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
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