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参数资料
| 型号： | FMS6408MTC147 |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | Triple Video Filter Driver for RGB and YUV Signals |
| 中文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| 封装： | 4.40 MM, LEAD FREE, MO-153, TSSOP-14 |
| 文件页数： | 11/11页 |
| 文件大小： | 389K |
| 代理商： | FMS6408MTC147 |
2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FMS6408 Rev. 3.0.0
9
FM
S6408
—
Triple
Video
Filt
er
D
river
f
o
rR
G
B
and
YU
V
Signals
Application Notes
Introduction
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 condition, but can cause a slight degradation
in gain matching.
Device Power Dissipation
The FMS6408 specications 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
signicantly affected by the applied load, particularly
in DC-coupled applications. To calculate the total
power dissipation the typical output voltages and the
loading must be known.
The highest power dissipation occurs for YUV video
signals DC-coupled into dual video loads (refer to
Figure 3).
Assume a video signal on the Y channel that
averages 50% luminance with an output voltage of
1.55V, then calculate the load current:
mA
6
.
20
75
/
V
55
.
1
)
Y
(
ILOAD
=
Ω
=
(1)
The device dissipation due to this load is the
internal voltage drop multiplied by the load current:
mW
71
mA
6
.
20
)
V
55
.
1
V
5
(
)
Y
(
PD
=
=
(2)
The average DC level for the U and V channels is set
by the clamp circuit to 1.125V. The signal is
symmetrical about this voltage, therefore:
mA
15
75
/
V
125
.
1
)
U
(
ILOAD
=
Ω
=
(3)
The device dissipation due to this load is the internal
voltage drop multiplied by the load current:
mW
125
.
58
mA
15
)
V
125
.
1
V
5
(
)
U
(
PD
=
=
(4)
Since the U and the V power dissipation are
approximately the same, the total dissipation due to
load can be estimated by:
mW
55
.
187
mW
125
.
58
2
mW
71
)
U
(
P
2
)
Y
(
P
)
load
(
PD
=
+
=
+
=
(5)
This brings 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 θJA, thermal resistance value.
Field Time Distortion
In applications with AC-coupled outputs, the AC-
coupling capacitors dominate the eld time distortion.
Performance is specied with 220F coupling
capacitors; if better performance is desired, the
capacitors may be increased or the outputs may be
DC-coupled.
+5V
VCC
YOUT
U
OUT
V
OUT
75
Ω
75
Ω Video Cables
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
Driver
I
Y
I
U
IV
+ VIY -
+ VIU -
+ VI
V
-
0.25V
0.85V
1.55V
2.25V
0.425V
1.125V
1.825V
0.425V
1.125V
1.825V
Figure 12.
YUV Video Signals that are DC-Coupled into Dual Video Loads
相关PDF资料 |
PDF描述 |
|---|---|
| FMS6408MTC148 | Triple Video Filter Driver for RGB and YUV Signals |
| FMS6410CS | Dual Channel Video Drivers with Integrated Filters and Composite Video Summer |
| FMS6410CSX | Dual Channel Video Drivers with Integrated Filters and Composite Video Summer |
| FMS6413 | Single Channel Video Driver with Integrated Filter and Clamp |
| FMS6414CS | Dual Channel Video Drivers with Integrated Filters |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FMS6408MTC148 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Precision Triple Video Filter Driver for RGB and YUV Signals |
| FMS6408MTC149 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Precision Triple Video Filter Driver for RGB and YUV Signals |
| FMS6410 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual Channel Video Drivers with Integrated Filters |
| FMS6410_04 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual Channel Video Drivers with Integrated Filters |
| FMS6410B | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual-Channel Video Drivers with Integrated Filters and Composite Video Summer |
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