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參數資料
型號: FMS6408MTC142
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 音頻/視頻放大
英文描述: Triple Video Filter Driver for RGB and YUV Signals
中文描述: 3 CHANNEL, VIDEO AMPLIFIER, PDSO14
封裝: 4.40 MM, LEAD FREE, MO-153, TSSOP-14
文件頁數: 7/9頁
文件大小: 250K
代理商: FMS6408MTC142
REV. 2C August 31, 2004
7
FMS6408
DATA SHEET
+5V
V
CC
YOUT
UOUT
VOUT
75
75
Video Cables
75
75
75
75
75
75
75
75
75
75
75
Driver
Driver
Driver
IY
IU
IV
+ VIY -
+ VIU -
+ VIV -
0.25V
0.85V
1.55V
2.25V
0.425V
1.125V
1.825V
0.425V
1.125V
1.825V
Application Notes
Output Drive Capability
The FMS6408 can drive dual 75
loads where each load
consists of a 75
resistor in series with a 75
termination
resistor in the driven device. This presents a 150
load to
the output so two similar loads in parallel look like 75
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.
Device Power Dissipation
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.
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.
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/75
= 20.6mA
The device dissipation due to this load will be the internal
voltage drop multiplied by the load current:
P
diss
(Y) = (5V - 1.55V) * 20.6mA = 71mW
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:
I
load
(U) = 1.125V/75
= 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:
P
diss
(load) = P (Y) + 2 * P (U) = 71mW +
(2 * 58.125mW) = 187.55mW
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.
Field Time Distortion
In applications with AC-coupled outputs, the AC-coupling
capacitors will dominate the field time distortion. Perfor-
mance is specified with 220
μ
F coupling capacitors; if better
performance is desired, the capacitors may be increased or
the outputs may be DC-coupled.
Figure 3. YUV Video Signals that are DC-Coupled into Dual Video Loads
相關PDF資料
PDF描述
FMS6408MTC143 Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC143X Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC144 Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC145 Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC141 Triple Video Filter Driver for RGB and YUV Signals
相關代理商/技術參數
參數描述
FMS6408MTC143 功能描述:視頻 IC Triple Video Drivers RGB-YUV Signals 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
FMS6408MTC143X 功能描述:視頻 IC TrplVidFiltrDrvr/RGB &YUV Sig_0.9dB Peak 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
FMS6408MTC144 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Precision Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC145 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Precision Triple Video Filter Driver for RGB and YUV Signals
FMS6408MTC146 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Precision Triple Video Filter Driver for RGB and YUV Signals
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