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參數(shù)資料
| 型號(hào)： | MAX445 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, High-Resolution, 200MHz Video CRT Driver(低功耗,高分辨率,Z軸視頻顯示器) |
| 中文描述： | 低成本，高解析度，200MHz的視頻CRT顯示器驅(qū)動(dòng)（低功耗，高分辨率，?軸視頻顯示器） |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 96K |
| 代理商： | MAX445 |
M
Table 1. Peaking Networks
(R
L
= 200
, R
S
= 100
)
Inductors L1, L2, and L3 should be air or ferrite-core
coils with self-resonant frequencies higher than
500MHz.
T hermal Environment
The MAX445 can dissipate a large amount of power
depending on speed and load-driving requirements. The
power-tab package provides a low thermal resistance
path from the chip to an external heatsink. Be sure the
board design provides sufficient heatsinking capacity for
the intended operating range. When mounting to a chas-
sis, it should be noted that the device tab is attached to
V
EE
(-10.5V). This tab should be electrically isolated from
ground through a thermally conductive insulator.
It is highly recommended that the external heatsink be
connected to ground, since an arc or electrostatic dis-
charge entering the heatsink may break down or
bypass the tab insulator and damage the device. Also,
the grounded heatsink to package tab capacitance will
help to bypass the V
EE
supply. Another option would
be to bypass the heatsink to ground with a 0.01μF
capacitor with no tab insulator. Inadvertently shorting
the package tab to ground for less than 10 seconds will
not cause component damage. J unction-to-case ther-
mal resistance is rated at 6°C/W for the power-tab DIP
package. Table 2 shows the relationship of output volt-
age and duty cycle to total power.
Table 2. Power Dissipation at V
AA
= 70V
and Load Resistor = 200
Circ uit Layout and Bypassing
Due to the extremely high-speed performance of the
MAX445, layout design precautions are required to
realize the display driver’s full high-speed capability.
The precautions are as follows:
1) A printed circuit board with a good, unbroken, low-
inductance ground plane is required.
2) Place a decoupling capacitor (0.01μF ceramic) as
close to V
CC
as possible.
3) Pay close attention to the decoupling capacitors’
resonant frequency and keep leads short.
4) On the inputs and outputs, keep lead lengths short
to avoid unwanted parasitic feedback around the
display driver.
5) Solder the MAX445 directly to the printed circuit
board. Do not use sockets.
Low-Cost, High-Resolution, 200MHz
Video CRT Driver
6
_______________________________________________________________________________________
Output Level
Relative to
Black (V)
Duty Cycle
(%)
IC Power
(W)
Load Power
(W)
Total
(W)
0
0
1.6
0
1.6
35
100
7.8
6.1
13.9
35
80
6.5
4.9
11.4
50
80
5.6
10.0
15.6
200
125
100
2
4
6
8
10
12
M
LOAD CAPACITANCE (pF)
B
150
175
3.0
1.5
1.0
2
4
6
8
10
12
M
LOAD CAPACITANCE (pF)
R
2.0
2.5
Figure 2. Typical Rise/Fall Time vs. Loading, with Peaking Network Optimized for Load Capacitance
C
L
(pF)
2
4
6
8
10
12
L3 (nH)
0
0
20
50
75
100
L1 (nH)
20
40
60
80
100
120
L2 (nH)
60
120
180
240
300
360
C
B
(pF)
0.4
0.8
1.1
1.5
2.0
2.2
t
R
(ns)
1.7
1.9
2.1
2.3
2.7
3.0
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