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參數(shù)資料
| 型號(hào)： | LM2429 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Monolithic Triple Channel 15 MHz DTV Driver |
| 中文描述： | 單片三頻道15兆赫數(shù)字電視驅(qū)動(dòng) |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大小： | 723K |
| 代理商： | LM2429 |
Application Hints
(Continued)
Figure 12
shows the typical cathode pulse response with an
output swing of 130V
PP
using a LM1269 preamplifier.
PC BOARD LAYOUT CONSIDERATIONS
For optimum performance, an adequate ground plane, iso-
lation between channels, good supply bypassing and mini-
mizing unwanted feedback are necessary.Also, the length of
the signal traces from the preamplifier to the LM2429 and
from the LM2429 to the CRT cathode should be as short as
possible. The following references are recommended:
Ott, Henry W., “Noise Reduction Techniques in Electronic
Systems”, John Wiley & Sons, New York, 1976.
“Video Amplifier Design for Computer Monitors”, National
Semiconductor Application Note 1013.
Pease,
Robert
A.,
“Troubleshooting
Butterworth-Heinemann, 1991.
Because of its high small signal bandwidth, the part may
oscillate in a TV if feedback occurs around the video channel
through the chassis wiring. To prevent this, leads to the video
amplifier input circuit should be shielded, and input circuit
wiring should be spaced as far as possible from output circuit
wiring.
Analog
Circuits”,
TYPICAL APPLICATION
A typical application of the LM2429 is shown in the sche-
matic for the NSC demonstration board in
Figure 14
and
Figure 15
. Used in conjunction with an LM126X preamplifier,
a complete video channel from input to CRT cathode can be
achieved. Performance is ideal for DTV applications. The
NSC demonstration board can be used to evaluate the
LM126X/LM2429 combination in a TV.
NSC DEMONSTRATION BOARD
Figure 16
shows the routing and component placement on
the NSC LM126X/LM2429 demonstration board. This board
provides a good example of a layout that can be used as a
guide for future layouts. Note the location of the following
components:
C19—V
bypass capacitor, located very close to pin 2
and ground pins
C20—V
BB
bypass capacitor, located close to pin 11 and
ground
C46, C48—V
bypass capacitors, near LM2429 and
V
CC
clamp diodes. Very important for arc protection.
The routing of the LM2429 outputs to the CRT is very critical
to achieving optimum performance.
Figure 17
shows the
routing and component placement from pin 10 (V1
OUT
) of
the LM2429 to the blue cathode. Note that the components
are placed so that they almost line up from the output pin of
the LM2429 to the blue cathode pin of the CRT connector.
This is done to minimize the length of the video path be-
tween these two components. Note also that D8, D9, R24
and D6 are placed to minimize the size of the video nodes
that they are attached to. This minimizes parasitic capaci-
tance in the video path and also enhances the effectiveness
of the protection diodes. The anode of protection diode D8 is
connected directly to a section of the the ground plane that
has a short and direct path to the LM2429 ground pins. The
cathode of D9 is connected to V
very close to decoupling
capacitor C48 which is connected to the same section of the
ground plane as D8. The diode placement and routing is
very important for minimizing the voltage stress on the
LM2429 during an arcover event. Lastly, notice that S3 is
placed very close to the blue cathode and is tied directly to
CRT ground.
This demonstration board uses large PCB holes to accom-
modate socket pins, which function to allow for multiple
insertions of the LM2429 in a convenient manner. To benefit
from the enhanced LM2429 package with thin leads, the
device should be secured in small PCB holes to optimize the
metal-to-metal spacing between the leads.
L
www.national.com
8
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| LM2432 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:220V Monolithic Single Channel 37 MHz HDTV CRT Driver |
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| LM2433 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:220V Monolithic Single Channel 16 MHz EDTV CRT Driver |
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