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參數(shù)資料
| 型號： | FMS6145MTC14 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Low-Cost Five-Channel 4th-Order Standard Defi nition Video Filter Driver |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封裝： | LEAD FREE, MO-153AB, TSSOP-14 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 558K |
| 代理商： | FMS6145MTC14 |
2006 Fairchild Semiconductor Corporation
FMS6145 Rev. 2.0.4
www.fairchildsemi.com
7
F
fi
Application Information
Application Circuits
The FMS6145 Low Cost Video Filter (LCVF) provides
6dB gain from input to output. In addition, the input is
slightly offset to optimize the output driver performance.
The offset is held to the minimum required value to
decrease the standing DC-current into the load. Typical
voltage levels are shown in the diagram below:
There is a 280mV offset from the DC input level to the
DC output level. V
OUT
= 2 * V
IN
+ 280mV.
0.0 -> 0.02V
0.3 -> 0.32V
0.65 -> 0.67V
1.0 -> 1.02V
V
IN
0.28V
0.88V
1.58V
2.28V
Driven by:
DC-Coupled DAC Outputs
AC-Coupled and Clamped
Y, CV, R, G, B
V
OUT
0.15V
0.5V
0.85V
V
IN
0.58V
1.28V
1.98V
Driven by:
AC-Coupled and Biased
U, V, Pb, Pr, C
V
OUT
Figure 7. Typical Voltage Levels
The FMS6145 provides an internal diode clamp to sup-
port AC-coupled input signals. If the input signal does not
go below ground, the input clamp does not operate. This
allows DAC outputs to directly drive the FMS6145 without
an AC coupling capacitor. When the input is AC coupled,
the diode clamp sets the sync tip (or lowest voltage) just
below ground. The worst-case sync tip compression due
to the clamp cannot exceed 7mV. The input level set by
the clamp, combined with the internal DC offset, keeps
the output within its acceptable range.
For symmetric signals like Chroma, U, V, Pb, and Pr, the
average DC bias is fairly constant and the inputs can be
AC coupled with the addition of a pull-up resistor to set
the DC input voltage. DAC outputs can also drive these
same signals without the AC coupling capacitor. A conceptual
illustration of the input clamp circuit is shown in Figure 8.
YOUT
Video Cables
Video Cables
75
Ω
75
Ω
75
Ω
75
Ω
Driver
YIN
LOAD1
LOAD2
(optional)
0.65V
Figure 8. Input Clamp Circuit
I/O Con
fi
gurations
For a DC-coupled DAC drive with DC-coupled outputs,
use the con
fi
guration in Figure 9.
DVD or
STB
SoC
DAC
Output
75
Ω
LCVF
Clamp
Inactive
0V - 1.4V
Figure 9. DC-Coupled Inputs and Outputs
Alternatively, if the DAC’s average DC output level causes
the signal to exceed the range of 0V to 1.4V, it can be AC
coupled as shown in FIgure 10.
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Active
0.1μ
0V - 1.4V
75Ω
Figure 10. AC-Coupled Inputs,
DC-Coupled Outputs
When the FMS6145 is driven by an unknown external
source or a SCART switch with its own clamping circuitry,
the inputs should be AC coupled as shown in Figure 11.
75Ω
LCVF
Clamp
Active
0.1μ
External video
source must
be AC coupled
0V - 1.4V
75Ω
Figure 11. SCART with DC-Coupled Outputs
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FMS6145MTC14X | Low-Cost Five-Channel 4th-Order Standard Defi nition Video Filter Driver |
| FMS6145 | Low Cost Five Channel 4th Order Standard Definition Video Filter Driver |
| FMS6145MTC14X_NL | RF CONNECTOR; SMA FEMALE, 4 HOLE PANEL MOUNT, SOLDER CUP CONTACT; MATERIALS: ; BODY PASSIVATED STAINLESS STEEL; CONTACT: GOLD PLATED; INSULATOR: PTFE |
| FMS6145MTC14_NL | RF CONNECTOR; SMA FEMALE, 2 HOLE PANEL MOUNT, STUB CONTACT, EXTENDED DIELECTRIC |
| FMS6146MTC14 | .68 UF/400VDC METAL POLY CAP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FMS6145MTC14_NL | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low Cost Five Channel 4th Order Standard Definition Video Filter Driver |
| FMS6145MTC14X | 功能描述:視頻 IC Video Filter Driver 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 |
| FMS6145MTC14X_NL | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low Cost Five Channel 4th Order Standard Definition Video Filter Driver |
| FMS6146 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PCB Layout Considerations for Video Filter / Drivers |
| FMS6146_07 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Cost Six-Channel 4th-Order Standard Defi nition Video Filter Driver |
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