Datasheet > FMS6246-9

FMS6246-9

更新时间： 2024-02-09 21:06:15

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

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中文翻译

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数据手册

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FMS6246-9 数据手册

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

OUT

Driver

800kΩ

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

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

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

LCVF

Clamp

Active

External Video

source must

be AC-coupled.

Figure 5. SCART Configuration with DC-coupled

Outputs

www.fairchildsemi.com

FMS6246 Rev. 1A

1 2 3 456 7 8...10

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与FMS6246-9相关器件

型号	品牌	获取价格	描述	数据表
FMS6246MTC20	FAIRCHILD	获取价格	Six Channel, 6th Order SD/PS Video Filter Driver
FMS6246MTC20_NL	FAIRCHILD	获取价格	Consumer Circuit, PDSO20, LEAD FREE, TSSOP-20
FMS6246MTC209	FAIRCHILD	获取价格	Six Channel, 6th Order SD/PS Video Filter Driver
FMS6246MTC20X	FAIRCHILD	获取价格	Six Channel, 6th Order SD/PS Video Filter Driver
FMS6246MTC20X_NL	FAIRCHILD	获取价格	Consumer Circuit, PDSO20, LEAD FREE, TSSOP-20
FMS6303	FAIRCHILD	获取价格	Low-Cost, 3-Channel, Video Filter Driver for SD/ED/HD (1080i)/HD (1080P)
FMS6303_12	FAIRCHILD	获取价格	Low-Cost, 3-Channel, Video Filter Driver for SD/ED/HD (1080i)/HD (1080P)
FMS6303MTC1406X	FAIRCHILD	获取价格	Low-Cost, 3-Channel, Video Filter Driver for SD/ED/HD (1080i)/HD (1080P)
FMS6303MTC1406X	ONSEMI	获取价格	视频滤波器驱动器，3 沟道，用于 SD、ED、HD (1080i) 和 HD (1080p
FMS6346	FAIRCHILD	获取价格	Six Channel, 6th Order SD/HD Video Filter Driver

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