P2779AG-08-SR [PULSECORE]
Low-Cost Notebook EMI Reduction IC; 低价笔记本EMI降低IC型号: | P2779AG-08-SR |
厂家: | PulseCore Semiconductor |
描述: | Low-Cost Notebook EMI Reduction IC |
文件: | 总8页 (文件大小:355K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
February 2007
rev 0.2
P2779A
Low-Cost Notebook EMI Reduction IC
Features
the clock source, which provides system-wide reduction of
EMI of all clock dependent signals. The P2779A 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 low EMI spread spectrum clock of
the input frequency
•
•
Operates between 20MHz and 38MHz input
frequency range
External loop filter for spread percentage
adjustment
The P2779A uses the most efficient and optimized
modulation profile approved by the FCC.
The P2779A 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.
•
•
•
•
•
•
•
Spreading ranges from ±0.25% to ±2.5%
Ultra low cycle-to-cycle jitter
Zero-Cycle slip at small deviations
3.3 V Operating Voltage
Low power CMOS design
Available in 8-pin SOIC and TSSOP Packages
Available in Industrial temperature operating
range (-40º C to 85º C)
Applications
The P2779A is targeted toward mobile 3D graphics chip set
applications.
Product Description
The P2779A is a versatile spread spectrum frequency
modulator designed specifically for mobile and digital
camera and other digital video and imaging applications.
The P2779A reduces electromagnetic interference (EMI) at
Block Diagram
VDD
PD
LF
PLL
Modulation
XIN
XOUT
REF
Frequency
Divider
Crystal
Oscillator
Output
Loop
Filter
Phase
VCO
Divider
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.
February 2007
P2779A
rev 0.2
Pin Configuration
XIN / CLKIN
XOUT
1
8
VDD
REF
2
7
6
5
P2779A
ModOUT
VSS
3
4
PD
LF
Pin Description
Pin#
Pin Name
XIN / CLKIN
XOUT
Type
Description
1
2
3
I
O
I
Connect to crystal or clock input.
Crystal output.
Power-down control pin. Pull low to enable power-down mode.
This pin has an internal pull-up resistor.1
PD
LF
External loop filter for the PLL. By changing the value of the CRC circuit,
the percentage spread can be adjusted accordingly.
4
I
(See Loop Filter Selection Table for detail values.)
5
6
7
8
VSS
ModOUT
REF
P
O
O
P
Ground connection. Connect to system ground.
Spread spectrum clock output.
Provides a reference clock output of the input frequency.
Connect to +3.3 V.
VDD
Note: 1. Connect to VDD if not used.
Loop Filter Selection Table VDD 3.3 V
Pin 4 LF
R1
C2
C1
BW = ± 0.50%
BW = ± 0.75%
BW = ± 1.00%
BW = ± 1.25%
Input
FS1 FS0
C1
C2
R1
(Ω)
C1
C2
R1
C1
C2
R1
C1
C2
R1
(MHz)
(pF)
(pF)
(pF)
(pF)
(Ω)
(pF)
(pF)
(Ω)
(pF)
(pF)
(Ω)
20
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
270 100,000
270 100,000
270 100,000
270 100,000
270 100,000
270 100,000
270 100,000
270 100,000
330
390
510
560
620
750
820
910
270 100,000 560
270 100,000 620
270 100,000 750
270 100,000 820
270 100,000 750
560 100,000
910
21-22
23-24
25-26
27-28
29-30
31-32
33-34
35-36
37-38
270 100,000 866(1%) 560 100,000
1,100
1,200
1,200
1,200
1,500
2,200
2,200
2,200
2,700
270 10,000
270 12,000
1,000
1,200
1,200
1,200
2,200
2,200
2,200
2,200
680 6,800
470 4,700
330 3,300
330 3,300
680 6,800
390 3,900
270 2,700
270 2,700
270 100,000 1,000 270 6,800
270 100,000 1,100 270 3,900
270 100,000 1,200 270 12,000
270 100,000 1,300 270 10,000
270 100,000 1,000 270 100,000 1,500 270 5,600
270 100,000 1,200 270 100,000 1,600 270 3,300
Please contact factory for loop filter values if desired spread settings are not listed.
Low-Cost Notebook EMI Reduction IC
2 of 8
Notice: The information in this document is subject to change without notice.
February 2007
rev 0.2
P2779A
Spread Spectrum Selection
The P2779A performs zero cycle slip when set at low percentage spreading. This prevents any 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 that the center frequency is the frequency of the external
reference input on XIN/CLKIN, pin 1.)
The P2779A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for
operation from 20MHz to 38MHz. The P2779A’s spread percentage selection is determined by the external LF value
specified in the Loop Filter Selection Table. The external LF allows the user to fine tune the spread percentage to optimize
the EMI reduction benefits of the spread spectrum.
Application Schematic
27 MHz
XIN/CLKIN VDD
1
2
3
4
8
7
6
5
0.1µF
XOUT
PD
REF
ModOUT
VSS
VDD
+3.3V
Modulated 27MHz
LF
R1
C1
P2779A
C2
PD selection: Power dissipation can be reduced by completely turning off the IC.
Low-Cost Notebook EMI Reduction IC
3 of 8
Notice: The information in this document is subject to change without notice.
February 2007
P2779A
rev 0.2
Absolute Maximum Ratings
Symbol
Parameter
Voltage on any pin with respect to Ground
Rating
-0.5 to +4.6
-65 to +125
-40 to +85
260
Unit
V
°C
°C
°C
°C
VDD, VIN
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.
DC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VIL
Input low voltage
VSS - 0.3
-
0.8
V
VIH
IIL
IIH
Input high voltage
Input low current
Input high current
2.0
-
-
-
60
0
VDD + 0.3
V
µA
µA
-
-
IXOL
IXOH
VOL
VOH
IDD
XOUT output low current (at 0.4 V, VDD = 3.3V)
XOUT output high current (at 2.5 V, VDD = 3.3V)
Output low voltage (VDD = 3.3V, IOL = 20 mA)
Output high voltage (VDD = 3.3V, IOH = 20 mA)
Static supply current
-
-
10
10
-
-
-
mA
mA
V
-
0.4
-
2.5
-
-
V
3
-
mA
Dynamic supply current
ICC
-
12
-
mA
(3.3 V, 25 pF loading, 32 MHz)
VDD
tON
Operating voltage
3.0
3.3
7
3.6
V
mS
Ω
Power-up time (first locked cycle after power up)
Clock output impedance
-
-
-
-
ZOUT
28
AC Electrical Characteristics
Symbol
Parameter
Min
Typ
-
-
1
1
±175
50
Max
Unit
fIN
Input frequency
20
20
-
-
-
38
38
-
-
-
MHz
MHz
nS
nS
pS
fOUT
Output frequency
1
tLH
tHL
Output rise time (measured at 0.8 V to 2.0 V)
Output fall time (measured at 2.0 V to 0.8 V)
Jitter (Cycle to cycle)
1
tJC
tD
Output duty cycle
45
55
%
Note: 1. tLH and tHL are measured into a capacitive load of 15 pF
Low-Cost Notebook EMI Reduction IC
4 of 8
Notice: The information in this document is subject to change without notice.
February 2007
P2779A
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
Note: Controlling dimensions are millimeters
SOIC – 0.074 grams unit weight
Low-Cost Notebook EMI Reduction IC
5 of 8
Notice: The information in this document is subject to change without notice.
February 2007
rev 0.2
P2779A
8-lead Thin Shrunk Small Outline Package (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
Note: Controlling dimensions are millimeters
TSSOP – 0.0325 grams unit weight
Low-Cost Notebook EMI Reduction IC
6 of 8
Notice: The information in this document is subject to change without notice.
February 2007
P2779A
rev 0.2
Ordering Information
Part number
P2779AF-08-ST
P2779AF-08-SR
P2779AG-08-ST
P2779AG-08-SR
I2779AF-08-ST
I2779AF-08-SR
I2779AG-08-ST
I2779AG-08-SR
P2779AF-08-TT
P2779AF-08-TR
P2779AG-08-TT
P2779AG-08-TR
I2779AF-08-TT
I2779AF-08-TR
I2779AG-08-TT
I2779AG-08-TR
Marking
P2779AF
Package Type
8-Pin SOIC, Tube, Pb Free
8-Pin SOIC, Tape and Reel, Pb Free
8-Pin SOIC, Tube, Green
8-Pin SOIC, Tape and Reel, Green
8-Pin SOIC, Tube, Pb Free
8-Pin SOIC, Tape and Reel, Pb Free
8-Pin SOIC, Tube, Green
8-Pin SOIC, Tape and Reel, Green
8-Pin TSSOP, Tube, Pb Free
8-Pin TSSOP, Tape and Reel, Pb Free
8-Pin TSSOP, Tube, Green
8-Pin TSSOP, Tape and Reel, Green
8-Pin TSSOP, Tube, Pb Free
8-Pin TSSOP, Tape and Reel, Pb Free
8-Pin TSSOP, Tube, Green
Temperature
Commercial
Commercial
Commercial
Commercial
Industrial
Industrial
Industrial
Industrial
Commercial
Commercial
Commercial
Commercial
Industrial
Industrial
Industrial
Industrial
P2779AF
P2779AG
P2779AG
I2779AF
I2779AF
I2779AG
I2779AG
P2779AF
P2779AF
P2779AG
P2779AG
I2779AF
I2779AF
I2779AG
I2779AG
8-Pin TSSOP, Tape and Reel, Green
Device Ordering Information
P 2 7 7 9 A F - 0 8 - S T
SR - SOIC, T/R
TT – TSSOP, TUBE
TR - TSSOP, T/R
ST – SOIC, TUBE
F = LEAD FREE AND RoHS COMPLIANT PART
G = GREEN PACKAGE, LEAD FREE, and RoHS
Flow:
P = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (-40°C to 85°C)
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Low-Cost Notebook EMI Reduction IC
7 of 8
Notice: The information in this document is subject to change without notice.
February 2007
rev 0.2
P2779A
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Copyright © PulseCore Semiconductor
All Rights Reserved
Preliminary Information
Part Number: P277A
Document Version: v0.2
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 2007 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.
Low-Cost Notebook EMI Reduction IC
8 of 8
Notice: The information in this document is subject to change without notice.
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