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參數資料
| 型號： | FMS6243MTC14X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Low-Cost, 3-Channel, SD Video Filter Drivers with External Delay Control |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封裝： | 4.40 MM, ROHS COMPLIANT, MO-153AB, TSSOP-14 |
| 文件頁數： | 7/10頁 |
| 文件大小： | 476K |
| 代理商： | FMS6243MTC14X |
2007 Fairchild Semiconductor Corporation
FMS6243 Rev. 1.0.0
www.fairchildsemi.com
7
Signal Peaking Adjustment
The peaking of a video input signal can be adjusted by
placing a peaking capacitor across the series-75ohm
resistor on the output of the FMS6243. Where the input
video signal to the FMS6243 has a soft roll-off, meaning
the input video signal is attenuated at 4Mhz by -0.5dB,
the Chroma/Luma gain is approximately -5% and fails a
system specification of +- 2.5%. This attenuation can be
adjusted by adding a 150pF capacitor across the series-
75ohm resistor on the output (see Figure 15). This brings
the attenuation at 4.0Mhz to approximately 0dB, giving a
Chroma/Luma gain of 0%. Figure 13 shows the peaking
effect of adding a peaking capacitor across the series-
75ohm resistor. The graph shows a 10pF delay capacitor
with a 10pF, 50pF, and 100pF peaking capacitor.
Figure 13. Frequency Response Delay Capacitor vs.
Peaking Capacitor
Group Delay and Peaking Adjustment
Simultaneously
If both a group delay adjustment and a peaking adjust-
ment need to be incorporated into the system design, the
following methodology should be followed. Address the
group delay adjustment first, then the peaking adjus-
ment, because the group delay adjustment causes a
video signal attenuation at 4Mhz.
Figure 14. Frequency Response vs. Delay Cap. Value
Figure 15. Schematic
5.90
5.95
6.00
6.05
6.10
6.15
6.20
6.25
6.30
6.35
6.40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Frequency (MHz)
G
10pF10pF
10pF50pF
10pF100pF
5.90
5.95
6.00
6.05
6.10
6.15
6.20
6.25
6.30
6.35
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Frequency (MHz)
G
10pF
40pF
80pF
400KHz
3.58MHz
4.43MHz
peaking
Delay Cap
Delay Cap
In1
220μF
In2
220μF
75
peaking
Out1
In3
75
220μF
peaking
75
3
4
5
14
13
10
11
12
9
8
1
2
6
7
IN1
IN2
IN3
VCC
GND4
OUT3
OUT2
OUT1
DCAP3
GND3
DCAP1
GND1
GND2
DCAP2
+
Out2
+
Delay Cap
+
V
CC
Out3
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相關代理商/技術參數 |
參數描述 |
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| FMS6246MTC20 | 功能描述:視頻 IC Ang fg 6Chanl 6thOrd SD/PSVidFiltrDr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| FMS6246MTC209 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Six Channel, 6th Order SD/PS Video Filter Driver |
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