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X2784AG-08TT

更新时间：2025-06-10 01:56:47
品牌：ALSC
描述：General Purpose EMI Reduction IC

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中文翻译

免费 PCB/SMT

X2784AG-08TT 概述

General Purpose EMI Reduction IC 通用EMI降低IC

X2784AG-08TT 数据手册

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July 2005  
rev 1.5  
P2781/82/84  
General Purpose EMI Reduction IC  
Features  
other digital video and imaging applications. The P278xA  
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.  
ƒ
ƒ
ƒ
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  
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
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”  
Zero-cycle slip  
the bandwidth of  
a synthesized clock and, more  
3.3V operating voltage range  
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.  
10 mA output drives  
TTL or CMOS compatible outputs  
Ultra-low power CMOS design  
P278XA is available in 8 pin SOIC and TSSOP  
Packages  
ƒ
Available for industrial and automotive  
temperature ranges.  
Applications  
Product Description  
The P278xA is a versatile spread spectrum frequency  
modulator designed specifically for digital camera and  
The P278xA is targeted towards MFP, xDSL, fax modem,  
set-top box, USB controller, DSC, and embedded systems.  
LF  
VDD  
FS1  
FS0  
Block Diagram  
PLL  
Modulation  
XIN /CLKIN  
Frequency  
Crystal  
Divider  
Output  
Divider  
Oscillator  
XOUT  
Phase  
Detector  
VCO  
Feedback  
Divider  
ModOUT  
VSS  
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  
P2781/82/84  
rev 1.5  
Pin Configuration  
XIN / CLKIN  
XOUT  
FS1  
VDD  
1
2
3
4
8
7
6
5
FS0  
P278XA-08S  
P278XA-08T  
ModOUT  
VSS  
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.  
Digital logic input used to select input frequency range  
(see the Input Frequency Selection Table). This pin has an internal pull-up  
resistor.  
1
XIN/CLKIN  
I
2
3
XOUT  
FS1  
O
I
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.  
Spread Spectrum Clock Output.  
ModOUT  
O
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  
2 of 11  
Notice: The information in this document is subject to change without notice.  
July 2005  
P2781/82/84  
rev 1.5  
Loop Filter Selection Table VDD 3.3V  
Contact Alliance 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)  
(pF)  
(ohm) (pF)  
(pF)  
(ohm) (pF)  
(pF)  
(ohm)  
(pF)  
(ohm)  
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
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 1,000 270  
270 100,000 1,200 270  
270 100,000  
270 100,000  
270 100,000  
390  
560  
750  
1,000  
1,200  
2,200  
2,200  
750  
560  
560  
560  
680  
330  
680  
270  
560  
100,000  
100,000  
100,000  
6,800  
3,300  
6,800  
510  
680  
910  
270  
10,000  
5,600  
1,200  
1,200  
2,200  
2,200  
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  
910  
1,100  
1,200  
1,200  
1,200  
1,500  
2,200  
2,200  
2,200  
2,700  
12,000  
5,600  
270 100,000  
270 100,000 1,000 270 100,000 1,500 270  
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  
270 100,000 510  
270 100,000 560  
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  
100,000  
100,000  
6,800  
4,700  
3,300  
3,300  
6,800  
3,900  
2,700  
270 100,000 866(1%) 560  
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  
3,900  
12,000  
10,000  
5,600  
270 100,000 1,000 270 100,000 1,500 270  
270 100,000 1,200 270 100,000 1,600 270  
19  
20  
3,300  
270 100,000  
270 100,000 866 (1%) 560  
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  
100,000  
100,000  
6,800  
4,700  
3,300  
3,300  
6,800  
3,900  
2,700  
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  
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  
3,900  
12,000  
10,000  
5,600  
270 100,000 1,000 270 100,000 1,500 270  
270 100,000 1,200 270 100,000 1,600 270  
3,300  
270 100,000  
270 100,000 866 (1%) 560  
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  
100,000  
100,000  
6,800  
4,700  
3,300  
3,300  
6,800  
3,900  
2,700  
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  
270 100,000 1,000 270 100,000 1,600 270  
270 100,000 1,200 270 100,000 1,800 270  
2,700  
1 The BW value is representative of typical conditions  
General Purpose EMI Reduction IC  
3 of 11  
Notice: The information in this document is subject to change without notice.  
July 2005  
P2781/82/84  
rev 1.5  
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.  
16 MHz  
XIN/CLKIN VDD  
1
2
3
4
8
7
6
5
0.1µF  
+3.3V  
2.2 K  
XOUT  
FS0  
FS1  
Modulated 16MHz Clock  
To target Chip  
ModOUT  
LF  
VSS  
R1  
C1  
P2781A  
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.  
July 2005  
P2781/82/84  
rev 1.5  
Absolute Maximum Ratings  
Symbol  
VDD  
VI  
Parameter  
Rating  
(VSS – 0.5) to 7  
(VSS-0.5) to (VDD+0.5)  
(VSS-0.5) to (VDD + 0.5)  
-50 to +50  
Unit  
V
Supply voltage, DC  
Input voltage, DC  
V
VO  
Output voltage, DC  
V
IIK  
Input clamp current (VI<0 or VI>VDD)  
Output clamp current (VI<0 or VI>VDD)  
Storage temperature  
mA  
mA  
°C  
°C  
°C  
°C  
IOK  
-50 to +50  
TS  
-65 to +125  
TA  
Ambient temperature range, under bias  
Junction temperature  
-55 to 125  
TJ  
150  
Lead temperature (soldering 10 sec)  
260  
Input static discharge voltage protection  
(As per JEDEC STD22- A114-B)  
2
kV  
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods 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  
Unit  
V
Input low voltage  
-
-
VIH  
Input high voltage  
Input low current  
VDD +0.3  
V
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  
-
3
-
mA  
Typical dynamic supply current  
(25pF scope probe loading)  
ICC  
5.2 at 3MHz  
3.0  
21.2 at 82MHz mA  
3.6  
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.  
July 2005  
P2781/82/84  
rev 1.5  
AC Electrical Characteristics  
Symbol  
Parameter  
Min  
Typ  
Max  
Unit  
fIN  
Input frequency: P278XA  
3
-
78  
MHz  
P2781A  
P2782A  
P2784A  
3
6
12  
78  
156  
312  
fOUT  
Output frequency:  
-
MHz  
tLH  
Output rise time (measured at 0.8 V to 2.0 V,  
-
1
-
nS  
nS  
pS  
%
P278XA 25pF scope probe loading)  
tHL  
Output fall time (measured at 2.0 V to 0.8 V, 25  
-
1
-
P278XA pF scope probe loading)  
tJC  
Jitter (cycle to cycle, ± 6sigma, 1000 sweeps,  
-
±250  
-
P2781A ± 0.5% spread, I/O frequency = 16MHz)  
tD  
Output duty cycle deviation (error from 50% duty  
±1 at 3MHz  
-20  
-
±2 at 82MHz  
+20  
P2781A cycle, 25pF scope probe loading)  
∆F  
Frequency deviation tolerance from BW% stated  
0
%
P278XA in the Loop Filter Selection Table  
General Purpose EMI Reduction IC  
6 of 11  
Notice: The information in this document is subject to change without notice.  
July 2005  
P2781/82/84  
rev 1.5  
Package Information  
Mechanical Package Outline 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.  
July 2005  
rev 1.5  
P2781/82/84  
Mechanical Package Outline 8-Pin TSSOP Package  
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
Note: Controlling dimensions are millimeters  
TSSOP - 0.0325 grams unit weight  
General Purpose EMI Reduction IC  
8 of 11  
Notice: The information in this document is subject to change without notice.  
July 2005  
P2781/82/84  
rev 1.5  
Ordering Codes  
Ordering #  
P278XA-08ST  
P278XA-08SR  
P278XA-08TT  
P278XA-08TR  
P278XAF-08ST  
P278XAF-08SR  
P278XAF-08TT  
P278XAF-08TR  
P278XAG-08ST  
P278XAG-08SR  
P278XAG-08TT  
P278XAG-08TR  
I278XA-08ST  
Marking  
P278XA  
P278XA  
P278XA  
P278XA  
P278XAF  
P278XAF  
P278XAF  
P278XAF  
P278XAG  
P278XAG  
P278XAG  
P278XAG  
I278XA  
Package Type  
QTY / Reel  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
2,500  
Temperature  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
See flow  
8 PIN SOIC, TUBE  
8 PIN SOIC, TAPE & REEL  
8 PIN TSSOP, TUBE  
8 PIN TSSOP, TAPE & REEL  
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  
I278XA-08SR  
I278XA  
8 PIN SOIC, TAPE & REEL  
I278XA-08TT  
I278XA  
8 PIN TSSOP, TUBE  
I278XA-08TR  
I278XA  
8 PIN TSSOP, TAPE & REEL  
8 PIN SOIC, TUBE, Pb Free  
I278XAF-08ST  
I278XAF-08SR  
I278XAF-08TT  
I278XAF-08TR  
I278XAG-08ST  
I278XAG-08SR  
I278XAG-08TT  
I278XAG-08TR  
X278XA-08ST  
X278XA-08SR  
X278XA-08TT  
X278XA-08TR  
X278XAF-08ST  
X278XAF-08SR  
X278XAF-08TT  
X278XAF-08TR  
X278XAG-08ST  
X278XAG-08SR  
X278XAG-08TT  
X278XAG-08TR  
I278XAF  
I278XAF  
I278XAF  
I278XAF  
I278XAG  
I278XAG  
I278XAG  
I278XAG  
X278XA  
X278XA  
X278XA  
X278XA  
X278XAF  
X278XAF  
X278XAF  
X278XAF  
X278XAG  
X278XAG  
X278XAG  
X278XAG  
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  
8 PIN SOIC, TAPE & REEL  
8 PIN TSSOP, TUBE  
8 PIN TSSOP, TAPE & REEL  
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  
General Purpose EMI Reduction IC  
9 of 11  
Notice: The information in this document is subject to change without notice.  
July 2005  
P2781/82/84  
rev 1.5  
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  
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)  
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920  
General Purpose EMI Reduction IC  
10 of 11  
Notice: The information in this document is subject to change without notice.  
July 2005  
rev 1.5  
P2781/82/84  
Copyright © Alliance Semiconductor  
All Rights Reserved  
Part Number: P2781/82/84  
Document Version: 1.5  
Alliance Semiconductor Corporation  
2575, Augustine Drive,  
Santa Clara, CA 95054  
Tel# 408-855-4900  
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.  
General Purpose EMI Reduction IC  
11 of 11  
Notice: The information in this document is subject to change without notice.  

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