Datasheet > FMS6408-6

FMS6408-6

更新时间： 2022-12-12 00:10:50

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		驱动器
页数	文件大小	规格书
9页	248K
描述
Triple Video Filter Driver for RGB and YUV Signals

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FMS6408-6 数据手册

FMS6408

DATA SHEET

Application Notes

P_diss(Y) = (5V - 1.55V) * 20.6mA = 71mW

Output Drive Capability

The average DC level for the U and V channels is set by the

clamp circuit to 1.125V. The signal will be symmetrical

about this voltage so:

The FMS6408 can drive dual 75Ω loads where each load

consists of a 75Ω resistor in series with a 75Ω termination

resistor in the driven device. This presents a 150Ω load to

the output so two similar loads in parallel look like 75Ω from

the output to ground. In some cases it may be desirable to

drive a single load on one or more outputs with a dual load

on the remaining outputs. This is an acceptable loading con-

dition but might cause a slight degradation in gain matching.

I_load(U) = 1.125V/75Ω = 15mA

The device dissipation due to this load will be the internal

voltage drop multiplied by the load current:

P_diss(U) = (5V - 1.125V) * 15mA = 58.125mW

Since the U and V power dissipation are approximately the

same, the total dissipation due to the load can be estimated

by:

Device Power Dissipation

P_diss(load) = P (Y) + 2 * P (U) = 71mW +

(2 * 58.125mW) = 187.55mW

The FMS6408 speciﬁcations provide a quiescent no-load

supply current of 52mA (typical). With a nominal 5V

supply, this results in a power dissipation of 260mW. The

overall power dissipation can be signiﬁcantly affected by the

applied load, particularly in DC-coupled applications. In

order to calculate the total power dissipation the typical

output voltages and the loading must be known.

This will bring the typical total device power dissipation to

260mW (quiescent power) + 187.55mW (load power) or

447.55mW. It is advisable to calculate the highest possible

power dissipation using worst-case quiescent supply current

and the maximum allowable power supply voltage. This

result should be used when calculating the die temperature

rise with the supplied θ_JA, thermal resistance value.

The highest power dissipation will occur for YUV video sig-

nals that are DC-coupled into dual video loads. Refer to the

the diagram in Figure 3 below.

Field Time Distortion

In applications with AC-coupled outputs, the AC-coupling

capacitors will dominate the ﬁeld time distortion. Perfor-

mance is speciﬁed with 220µF coupling capacitors; if better

performance is desired, the capacitors may be increased or

the outputs may be DC-coupled.

Assume a video signal on the Y channel that averages 50%

luminance with an output voltage of 1.55V then calculate the

load current:

I_load(Y) = 1.55V/75Ω = 20.6mA

The device dissipation due to this load will be the internal

voltage drop multiplied by the load current:

+5V

75Ω Video Cables

75Ω

2.25V

1.55V

75Ω

0.85V

0.25V

75Ω

OUT

Driver

+ VI

75Ω

1.825V

1.125V

0.425V

75Ω

OUT

Driver

+ VI

75Ω

1.825V

1.125V

0.425V

75Ω

OUT

Driver

+ VI

75Ω

Figure 3. YUV Video Signals that are DC-Coupled into Dual Video Loads

REV. 2C August 31, 2004

1...4 5 678 9

中文翻译

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与FMS6408-6相关器件

型号	品牌	获取价格	描述	数据表
FMS6408-7	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408-8	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408-9	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC141	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC141_NL	FAIRCHILD	获取价格	Video Amplifier, 3 Channel(s), 1 Func, PDSO14, LEAD FREE, TSSOP-14
FMS6408MTC1410	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC1411	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC1412	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC141X	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC142	FAIRCHILD	获取价格	Triple Video Filter Driver for RGB and YUV Signals

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