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參數(shù)資料
| 型號： | MAX11505CUB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC STD VIDEO FILTER 4CH 10UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 視頻濾波器 |
| 應(yīng)用： | DVD，機頂盒 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 帶卷 (TR) |
MAX11504/MAX11505
Four-Channel, Standard-Definition
Video Filters
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 signal,
and keep the line-time distortion within desired limits. The
capacitor value is a function of the input leakage and
impedance of the circuit being driven. Common industry
practice is to use a 220F or larger coupling capacitor. If
any or all outputs are driving two parallel loads, see the
Junction Temperature Calculations section.
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 PD using:
where PDS is the quiescent power dissipated in the die,
and given by:
and where PDOn is the power dissipated in the nth dri-
ver stage and given by:
where VORMSn is the RMS output voltage and RL 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) VCC = 5.0V.
7) ICC = 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 TJ = junction temperature, TA = ambient temper-
ature (assume +70°C) and RθJA = 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. RθJA = 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.
TC
J =+
°
101
TC
J =+
×
= +
°
70 113
0 432
119
.
TT
R
P
J
A
JA
D
=+
×
()
θ
PW
D =
++++=
0 12 0 078 0 078 0 078 0 078 0 432
.
.....
PW
DOn =
×
=
(.
)
.
5 1 88
1 88
75
0 078
PW
DS =×
=
5 0 024
0 12
..
P
VV
V
R
DOn
CC
ORMSn
L
=
×
()
PV
I
DS
CC
=×
P
PPP
D
DS
DO
DODODO
=
+
+++
1
234
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