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參數(shù)資料
| 型號(hào)： | FMS6243MTC14X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)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(shù)： | 5/10頁 |
| 文件大?。?/td> | 476K |
| 代理商： | FMS6243MTC14X |
2007 Fairchild Semiconductor Corporation
FMS6243 Rev. 1.0.0
www.fairchildsemi.com
5
Application Information
The FMS6243 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:
Figure 3. Typical Voltage Levels
The FMS6243 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 FMS6243 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 can not 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
signals without the AC-coupling capacitor. A conceptual
illustration of the input clamp circuit is shown below:
Figure 4. Input Clamp Circuit
I/O Configurations
For DC-coupled DAC drive with DC-coupled outputs, use
this configuration:
Figure 5. 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 follows:
Figure 6. AC-Coupled Inputs, DC-Coupled Outputs
When driven by an unknown external source or a
SCART switch with its own clamping circuitry, the inputs
should be AC-coupled like this:
Figure 7. SCART with DC-Coupled Outputs
The same method can be used for biased signals with
the addition of a pull-up resistor to make sure the clamp
never operates. The internal pull-down resistance is
800k
Ω
±20% so the external resistance should be
7.5M
Ω
to set the DC level to 500mV.
Figure 8. Biased SCART with DC-Coupled Outputs
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相關(guān)代理商/技術(shù)參數(shù) |
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| FMS6246 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Six Channel, 6th Order SD/PS Video Filter Driver |
| FMS6246_06 | 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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| 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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