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參數(shù)資料
| 型號(hào)： | P2779A-08TRF |
| 廠商： | Alliance Semiconductor Corporation |
| 英文描述： | Low-Cost Notebook EMI Reduction IC |
| 中文描述： | 低成本筆記本電腦芯片降低電磁干擾 |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大?。?/td> | 197K |
| 代理商： | P2779A-08TRF |
June 2005
rev 0.1
Pin Configuration
Pin Description
P2779A
Low-Cost Notebook EMI Reduction IC
2 of 8
Notice: The information in this document is subject to change without notice.
Pin#
Pin Name
Type
Description
1
XIN / CLKIN
I
Connect to crystal or clock input.
2
XOUT
O
Crystal output.
3
PD
I
Power-down control pin. Pull low to enable power-down mode.
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 Loop Filter Selection Table for detail values.)
4
LF
I
5
VSS
P
Ground connection. Connect to system ground.
6
ModOUT
O
Spread spectrum clock output.
7
REF
O
Provides a reference clock output of the input frequency.
8
VDD
P
Connect to +3.3 V.
Note: 1. Connect to VDD if not used.
Loop Filter Selection Table VDD 3.3 V
Input
(MHz)
BW = ± 0.50%
C2
(pF)
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
BW = ± 0.75%
C2
(pF)
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
BW = ± 1.00%
C2
(pF)
100,000
100,000
10,000
12,000
6,800
3,900
12,000
10,000
5,600
3,300
BW = ± 1.25%
C2
(pF)
100,000
100,000
6,800
4,700
3,300
3,300
6,800
3,900
2,700
2,700
FS1
FS0
C1
(pF)
270
270
270
270
270
270
270
270
270
270
R1
(
)
330
390
510
560
620
750
820
910
1,000
1,200
C1
(pF)
270
270
270
270
270
270
270
270
270
270
R1
(
)
560
620
750
820
1,000
1,100
1,200
1,300
1,500
1,600
C1
(pF)
270
270
270
270
270
270
270
270
270
270
R1
(
)
C1
(pF)
560
560
680
470
330
330
680
390
270
270
R1
(
)
910
1,100
1,200
1,200
1,200
1,500
2,200
2,200
2,200
2,700
20
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
750
866(1%)
1,000
1,200
1,200
1,200
2,200
2,200
2,200
2,200
21-22
23-24
25-26
27-28
29-30
31-32
33-34
35-36
37-38
Please contact factory for loop filter values if desired spread settings are not listed.
C2
C1
R1
Pin 4 LF
REF
VSS
1
2
3
4
5
6
7
8
P2779A
XIN/ CLKIN
XOUT
PD
LF
VDD
ModOUT
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| P2782A-08SR | General Purpose EMI Reduction IC |
| P2781AF-08SR | General Purpose EMI Reduction IC |
| P2781AF-08ST | General Purpose EMI Reduction IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P2779A-08TT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| P2779A-08TTF | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| P2779AF-08SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| P2779AF-08-SR | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Low-Cost Notebook EMI Reduction IC |
| P2779AF-08ST | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
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