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| 型號： | ADV7152LS220 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顯示控制器 |
| 英文描述： | CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC |
| 中文描述： | PALETTE-DAC DSPL CTLR, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 31/32頁 |
| 文件大?。?/td> | 454K |
| 代理商： | ADV7152LS220 |
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ADV7152
–31–
REV. B
APPE NDIX 7
T HE RMAL AND E NVIRONME NT AL CONSIDE RAT IONS
T able A. T hermal Characteristics vs. Airflow
Air Velocity
(Linear feet/min)
0
(Still Air)
50
100
200
θ
JA
(
°
C/W)
No Heatsink
EG&G D10100-28 Heatsink 32
T hermalloy 2290 Heatsink
35
31
28
21
28
25
18
25
22
15
25
T hermal Model
T he junction temperature of the device in a specific application
is given by:
T
J
=
T
A
+
P
D
(
θ
J C
+
θ
CA
)
or
T
J
=
T
A
+
P
D
(
θ
J A
)
(1)
(2)
where:
T
J
= Junction T emperature of Silicon (
°
C)
T
A
= Ambient T emperature (
°
C)
P
D
= Power Dissipation (W)
θ
J C
= Junction to Case T hermal Resistance (
°
C/W)
θ
CA
= Case to Ambient T hermal Resistance (
°
C/W)
θ
J A
= Junction to Ambient T hermal Resistance (
°
C/W)
Package E nhancements
T he standard QFP package has been enhanced to a PowerQuad2
package. T his supports an improved thermal performance come
pared to standard QFP. In this case, the die is attached to
heatslug so that the power that is dissipated can be conducted to
the external surface of the package. T his provides a highly effi-
cient path for the transfer of heat to the package surface. T he
package configuration also provides an efficient thermal path
from the ADV7152 to the Printed Circuit Board via the leads.
Heatsinks
T he maximum silicon junction temperature should be limited to
100
°
C. T emperatures greater than this will reduce long term
device reliability. T o ensure that the silicon junction tempera-
ture stays within prescribed limits, the addition of an external
heatsink may be necessary. Heatsinks, will reduce
θ
JA
as shown
in the “T hermal Characteristics vs. Airflow” table.
T he ADV7152 is a very highly integrated monolithic silicon
device. T his high level of integration, in such a small package,
inevitably leads to consideration of thermal and environmental
conditions in which the ADV7152 must operate. Reliability of
the device is significantly enhanced by keeping it as cool as pos-
sible. In order to avoid destructive damage to the device, the
absolute maximum junction temperature of 150
°
C must never
be exceeded. Certain applications, depending on pixel data
rates, may require forced air cooling, or external heatsinks. T he
following data is intended as a guide in evaluating the operating
conditions of a particular application so that optimum device
and system performance is achieved.
I
t should be noted that information on package characteristics pub-
lished herein may not be the most up to date at the time of reading
this. Advances in package compounds and manufacture will inevita-
bly lead to improvements in the thermal data. Please contact your
local sales office for the most up-to-date information.
Power Dissipation
T he diagram shows graphs of power dissipation in watts vs.
pixel clock frequency for the ADV7152.
1.50
0.75
0.50
1.25
1.00
P
V
AA
= +5V
V
REF
= +1.2V
T
A
= 25
°
C
180
80
160
140
120
100
PIXEL CLOCK FREQUENCY – MHz
60
200
220
THE "TYPICAL ON-SCREEN PATTERN" CORRESPONDS TO LINEAR CHANGES IN THE
PIXEL
INPUT (I. E., A BLACK TO WHITE RAMP). IN GENERAL, COLOR IMAGES TEND TO
APPROXIMATE THIS CHARACTERISTIC.
*
Typical Power Dissipation vs. Pixel Rate
Package Characteristics
T he table of thermal characteristics shows typical information
for the ADV7152 (100-Lead Plastic Power QFP) using various
values of Airflow.
Junction to Case (
θ
JC
) T hermal Resistance for this particular
part is:
θ
J C
(
100-Lead Plastic Power QFP)
=
1.0
°
C/W
(
Note: 0
°
C is independent of airflow.)
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