Datasheet > FMS6246-9

FMS6246-9

更新时间： 2022-11-24 21:17:35

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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FMS6246-9 数据手册

The same method can be used for biased signals with the addi-

tion of a pull-up resistor to make sure the clamp never operates.

The internal pull-down resistance is 800kΩ 20% so the exter-

nal resistance should be 7.5MΩ to set the DC level to 500mV. If

a pull-up resistance less than 7.5MΩ is desired, an external

pull-down can be added such that the DC input level is set to

500mV.

Power Dissipation

The FMS6246 output drive configuration must be considered

when calculating overall power dissipation. Care must be taken

not to exceed the maximum die junction temperature. The fol-

lowing example can be used to calculate the FMS6246’s power

dissipation and internal temperature rise.

T_j= T_A+ P_d• Θ_JA

where P_d= P_CH1+ P_CH2+ P_CHx

and P_CHx= V_s• I_CH- (V_O²/R_L)

where

External Video

source must

be AC-coupled.

0.1u

LCVF

Bias

Input

7.5M

V_O= 2V_in+ 0.280V

I_CH= (I_CC/ 6) + (V_O/R_L)

V_in= RMS value of input signal

I_CC= 60mA

500mV +/-350mV

Figure 6. Biased SCART with DC-coupled Outputs

V_s= 5V

The same circuits can be used with AC-coupled outputs if

desired.

R_L= channel load resistance

Board layout can also affect thermal characteristics. Refer to the

Layout Considerations Section for more information.

0V - 1.4V

220u

DVD or

STB

SoC

LCVF

Clamp

Inactive

Layout Considerations

General layout and supply bypassing play major roles in high

frequency performance and thermal characteristics. Fairchild

offers a demonstration board, FMS6246DEMO, to use as a

guide for layout and to aid in device testing and characterization.

The FMS6246DEMO is a 4-layer board with a full power and

ground plane. Following this layout configuration will provide the

optimum performance and thermal characteristics. For optimum

results, follow the steps below as a basis for high frequency lay-

out:

DAC

Output

Figure 7. DC-coupled inputs, AC-coupled Outputs

0V - 1.4V

•

Include 10µF and 0.1µF ceramic bypass capacitors

0.1u

220u

DVD or

STB

SoC

DAC

Output

LCVF

Clamp

Active

Place the 10µF capacitor within 0.75 inches of the power pin

Place the 0.1µF capacitor within 0.1 inches of the power pin

For multi-layer boards, use a large ground plane to help dissi-

pate heat

•

For 2 layer boards, use a ground plane that extends beyond

the device by at least 0.5”

Figure 8. AC-coupled inputs and outputs

Minimize all trace lengths to reduce series inductances

External video

source must

be AC-coupled.

0.1u

220u

LCVF

Clamp

Active

7.5M

500mV +/-350mV

Figure 9. Biased SCART with AC-Coupled Outputs

NOTE: The video tilt or line time distortion will be dominated by

the AC-coupling capacitor. The value may need to be increased

beyond 220uF in order to obtain satisfactory operation in some

applications.

www.fairchildsemi.com

FMS6246 Rev. 1A

1...3 4 567 8 9 10

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与FMS6246-9相关器件

型号	品牌	描述	获取价格	数据表
FMS6246MTC20	FAIRCHILD	Six Channel, 6th Order SD/PS Video Filter Driver	获取价格
FMS6246MTC20_NL	FAIRCHILD	Consumer Circuit, PDSO20, LEAD FREE, TSSOP-20	获取价格
FMS6246MTC209	FAIRCHILD	Six Channel, 6th Order SD/PS Video Filter Driver	获取价格
FMS6246MTC20X	FAIRCHILD	Six Channel, 6th Order SD/PS Video Filter Driver	获取价格
FMS6246MTC20X_NL	FAIRCHILD	Consumer Circuit, PDSO20, LEAD FREE, TSSOP-20	获取价格
FMS6303	FAIRCHILD	Low-Cost, 3-Channel, Video Filter Driver for SD/ED/HD (1080i)/HD (1080P)	获取价格

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