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參數(shù)資料
| 型號： | MAX11505 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Four-Channel, Standard-Definition Video Filter |
| 中文描述： | 四通道、標(biāo)清視頻濾波器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 247K |
| 代理商： | MAX11505 |
M
Four-Channel, Standard-Definition
Video Filter
8
_______________________________________________________________________________________
Applications Information
Output Configuration
The MAX11504/MAX11505 outputs may be either DC-
or AC-coupled. If AC-coupled, choose a capacitor that
passes the lowest frequency content of the video sig-
nal, and keep the line-time distortion within desired lim-
its. The capacitor value is a function of the input leakage
and impedance of the circuit being driven. Common
industry practice is to use a 220μF or larger coupling
capacitor. If any or all outputs are driving two parallel
loads, refer to the junction temperature calculations.
The MAX11504/MAX11505 outputs are fully protected
against short circuits either to the ground or the positive
supply of the device. The short-circuit protection cir-
cuitry limits the output current to 80mA (typical) per out-
put. Shorting more than one output simultaneously can
exceed the maximum package power dissipation.
Junction Temperature Calculations
Die temperature is a function of quiescent power dissi-
pation and the power dissipation in the output drivers.
Calculate the power dissipated P
D
using:
where P
DS
is the quiescent power dissipated in the die,
and given by:
and where P
DOn
is the power dissipated in the n
th
dri-
ver stage and given by:
where V
ORMSn
is the RMS output voltage and R
L
is the
load resistance.
Example - Assuming these conditions:
1. Video standard = 525/60/2:1
2. Video format = RGB with syncs on all channels
3. Picture content = 100% white
4. The input signal is AC-coupled
5. The output signal is DC-coupled
6. V
CC
= 5.0V
7. I
CC
= 24mA
A sync tip exists at 280mV and peak white exists at
2.28V. The RMS voltage will be approximately 1.88V on
each output (80% of the peak-peak voltage, plus the
offset) giving:
and
The junction temperature is given by:
where T
J
= junction temperature, T
A
= ambient temper-
ature (assume +70°C) and R
θ
JA
= thermal resistance
junction to ambient.
From the Absolute Maximum Ratings section of the
data sheet, the derating factor is 8.8mW/°C above
+70°C. R
θ
JA
= 1/(derating factor) = 1/(8.8mW/°C) =
113°C/W.
Therefore:
If there is only one video load on each output, the junc-
tion temperature lowers to:
The above calculations assume the use of a multilay-
ered board with extensive ground planes for high ther-
mal efficiency. Using such a board is especially
important in applications where there are two video
loads on each channel.
T
C
J
= +
°
101
T
C
J
=
×
= +
°
70 113
0 432
.
119
T
T
R
(
P
J
A
JA
θ
D
=
+
×
)
P
W
D
=
+
+
+
+
=
0 12
.
0 078
.
0 078
.
0 078
.
0 078
.
0 432
.
P
W
DOn
=
×
=
(
.
)
.
.
5 1 88
1 88
75
0 078
P
W
DS
=
=
5 0 024
0 12
.
.
P
V
V
V
R
DOn
CC
ORMSn
ORMSn
L
=
×
(
)
P
V
I
DS
CC
CC
=
×
P
P
P
P
P
P
D
DS
DO
DO
DO
DO
=
+
+
+
+
1
2
3
4
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| MAX11505CUB+ | 功能描述:視頻 IC 4Ch Standard-Def Video Filter 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 |
| MAX11505CUB+T | 功能描述:視頻 IC 4Ch Standard-Def Video Filter 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 |
| MAX11506 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Cost, 6-Channel SD Plus HD/SD Selectable Video Filters and Buffers |
| MAX11506CEE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Cost, 6-Channel SD Plus HD/SD Selectable Video Filters and Buffers |
| MAX11506CEE+ | 功能描述:視頻 IC 6Ch SD+HD/SD Select Video Filters & Buff 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 |
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