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FMS6246-9 PDF预览

FMS6246-9

更新时间: 2024-02-28 14:22:58
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 驱动器
页数 文件大小 规格书
10页 93K
描述
Six Channel, 6th Order SD/PS Video Filter Driver

FMS6246-9 数据手册

 浏览型号FMS6246-9的Datasheet PDF文件第2页浏览型号FMS6246-9的Datasheet PDF文件第3页浏览型号FMS6246-9的Datasheet PDF文件第4页浏览型号FMS6246-9的Datasheet PDF文件第6页浏览型号FMS6246-9的Datasheet PDF文件第7页浏览型号FMS6246-9的Datasheet PDF文件第8页 
coupling capacitor. A conceptual illustration of the input clamp  
circuit is shown below:  
Applications Information  
Functional Description  
The FMS6246 Low Cost Video Filter (LCVF) provides 6dB gain  
(9dB optional, contact factory for further information) from input  
to output. In addition, the input will be 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.  
0.65V  
Y
OUT  
Y
Driver  
IN  
800k  
1.0 -> 1.02V  
0.65 -> 0.67V  
0.3 -> 0.32V  
Figure 2. Input Clamp Circuit  
I/O Configurations  
0.0 -> 0.02V  
Vin  
For DC-coupled DAC drive with DC-coupled outputs, use this  
configuration:  
Driven by:  
2.28V  
1.58V  
DC-Coupled DAC Outputs or  
AC-Coupled and Clamped  
Y, R, G, B, CV  
0V - 1.4V  
75  
DVD or  
STB  
SoC  
LCVF  
Clamp  
Inactive  
0.88V  
0.28V  
Vout  
DAC  
Output  
There will be a 280mV offset from the DC input level to  
the DC output level.  
Vout = 2 * Vin + 280mV  
0.85V  
0.5V  
Figure 3. 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:  
0.15V  
Vin  
0V - 1.4V  
1.98V  
0.1u  
75  
Driven by:  
DC-Coupled DAC Outputs  
AC-Coupled and Biased  
U, V, Pb, Pr, C  
DVD or  
STB  
SoC  
DAC  
Output  
LCVF  
Clamp  
Active  
1.28V  
0.58V  
Vout  
Figure 1. Typical Voltage Levels  
The FMS6246 provides an internal diode clamp to support AC-  
coupled input signals. If the input signal does not go below  
ground, the input clamp will not operate. This allows DAC out-  
puts to directly drive the FMS6246 without an AC coupling  
capacitor. The worst-case sync tip compression due to the  
clamp will not exceed 7mV. The input level set by the clamp  
combined with the internal DC offset will keep the output within  
its acceptable range. When the input is AC-coupled, the diode  
clamp will set the sync tip (or lowest voltage) just below ground.  
Figure 4. AC-coupled Inputs, DC-coupled Outputs  
When the FMS6246 is driven by an unknown external source or  
a SCART switch with its own clamping circuitry the inputs  
should be AC-coupled as follows:  
0V - 1.4V  
For symmetric signals like C, U, V, Cb, Cr, Pb and Pr, the aver-  
age 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  
0.1u  
75  
LCVF  
Clamp  
Active  
External Video  
source must  
be AC-coupled.  
75  
Figure 5. SCART Configuration with DC-coupled  
Outputs  
5
www.fairchildsemi.com  
FMS6246 Rev. 1A  

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