MAX11505CUB+T Maxim Integrated Products, MAX11505CUB+T Datasheet - Page 8

• Manufacturer Part Number: MAX11505CUB+T
• Description: IC STD VIDEO FILTER 4CH 10UMAX
• Manufacturer: Maxim Integrated Products
• Type: Video Filterr

Specifications of MAX11505CUB+T

• Applications: DVD, Set-Top Boxes
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Four-Channel, Standard-Definition
Video Filters
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 220µF 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.
Die temperature is a function of quiescent power dissi-
pation and the power dissipation in the output drivers.
Calculate the power dissipated P
where P
and given by:
and where P
ver stage and given by:
where V
load resistance.
Example - Assuming these conditions:
8
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
7) I
_______________________________________________________________________________________
CC
CC
DS
ORMSn
P
= 24mA.
D
P
= 5.0V.
is the quiescent power dissipated in the die,
DOn
DOn
=
P
Applications Information
is the RMS output voltage and R
DS
=
is the power dissipated in the n
Junction Temperature Calculations
(
+
V
P
P
CC
DS
DO
−
1
=
+
V
V
ORMSn
P
CC
Output Configuration
DO
R
×
2
L
D
+
I
CC
)
P
using:
×
DO
V
ORMSn
3
+
P
DO
4
L
th
is the
dri-
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
ature (assume +70°C) and R
junction to ambient.
From the Absolute Maximum Ratings section of the
data sheet, the derating factor is 8.8mW/°C above
+70°C. R
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.
P
D
=
0 12 0 078 0 078 0 078 0 078 0 432
J
.
= junction temperature, T
θJA
P
DOn
+
T
= 1/(derating factor) = 1/(8.8mW/°C) =
J
.
P
=
DS
=
T
70 113 0 432
J
(
5 1 88
=
+
= ×
+
−
T
5 0 024 0 12
T
A
.
J
.
+
= +
75
.
(
×
)
R
+
×
101
θ
.
1 88
JA
θJA
.
.
=
°
×
C
.
= thermal resistance
= +
=
P
A
+
D
0 078
= ambient temper-
W
.
)
119
.
°
W
C
=
.
W