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參數(shù)資料
| 型號： | LM2426 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Monolithic Triple Channel 30 MHz DTV Driver |
| 中文描述： | 單片三通道30兆赫數(shù)字電視驅(qū)動 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 808K |
| 代理商： | LM2426 |
Application Hints
(Continued)
Figure 12
shows the typical cathode pulse response with an
output swing of 110V
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 LM2426TE and
from the LM2426TE 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 LM2426TE 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 HDTV applications. The
NSC demonstration board can be used to evaluate the
LM126X/2426 combination in a TV.
NSC DEMONSTRATION BOARD
Figure 16
shows the routing and component placement on
the NSC LM126X/2426 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 LM2426TE and
V
CC
clamp diodes. Very important for arc protection.
The routing of the LM2426TE 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 LM2426TE to the blue cathode. Note that the compo-
nents are placed so that they almost line up from the output
pin of the LM2426TE to the blue cathode pin of the CRT
connector. This is done to minimize the length of the video
path between 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
capacitance in the video path and also enhances the effec-
tiveness 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 LM2426TE
ground pins. The cathode of D9 is connected to V
very
close to decoupling capacitor C48 (see
Figure 17
) which is
connected to the same section of the ground plane as D8.
The diode placement and routing is very important for mini-
mizing the voltage stress on the LM2426TE during an ar-
cover 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 LM2426TE in a convenient manner. To
benefit from the enhanced LM2426TE 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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2426TE | Monolithic Triple Channel 30 MHz DTV Driver |
| LM2429 | Monolithic Triple Channel 15 MHz DTV Driver |
| LM2432 | 220V Monolithic Single Channel 37 MHz HDTV CRT Driver |
| LM2432TE | 220V Monolithic Single Channel 37 MHz HDTV CRT Driver |
| LM2436 | Monolithic Triple 7.5 ns CRT Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2426CT WAF | 制造商:Texas Instruments 功能描述: |
| LM2426TA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM2426TE | 制造商:Rochester Electronics LLC 功能描述:DTV TRIPLE DRIVER, 30 MHZ, 180 - Bulk |
| LM2426TE/NOPB | 功能描述:IC DRIVER DTV 3CH 30MHZ 11-TO220 RoHS:是 類別:集成電路 (IC) >> PMIC - 顯示器驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 顯示器類型:真空熒光 (VF) 配置:5 x 7（矩陣） 接口:串行 數(shù)字或字符:- 電流 - 電源:3.5mA 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-QSOP 包裝:帶卷 (TR) |
| LM2427 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Triple 80 MHz CRT Driver |
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