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參數(shù)資料
| 型號： | LM1253 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| 中文描述： | 單片三180兆赫的I2C顯像管預(yù)先集成在屏幕顯示（OSD）發(fā)生器模擬放大器 |
| 文件頁數(shù)： | 12/57頁 |
| 文件大?。?/td> | 1621K |
| 代理商： | LM1253 |
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Pin Descriptions
(Continued)
VFLYBACK vertical flyback pulse is kept high during that ini-
tial period to prevent the output VBLANK from switching be-
tween high and low states.
Loss of vertical flyback pulse implies that the monitor is not
scanning, and therefore no image is being displayed. The
VBLANK pulses are still required by the LM2453 CRT driver
in order to maintain correct bias conditions in the CRT until
the power supplies are switched off, but video will be set at
black level to prevent front of screen problems, using the
NO_VID line. See also the Loss of Vertical Flyback Pulse
section. Figure 29 shows the external schematic of pin 15,
Figure 19 shows the internal schematic.
Pin 16—SDA
The I
2
C data line. A pull up resistor of about
2 k
should be connected between this pin and +5V.A300
resistor should be connected in series with the data line to
protect the IC against arcing. Figure 29 shows the external
schematic of pin 16, Figure 20shows the internal schematic.
Pin 17—SCL
The I
2
C clock line. A pull up resistor of about
2 k
should be connected between this pin and +5V.A300
resistor should be connected in series with the clock line to
protect the IC against arcing. Figure 29 shows the external
schematic of pin 17, Figure 20shows the internal schematic.
Pin 18—Digital Ground
Ground for the OSD section of the
LM1253A. All ground pins of the LM1253A should be con-
nected together by a ground plane under the LM1253A. See
Figure 31 which shows a sample layout.
Pin 19—Digital Supply
5V supply for the OSD section of
the LM1253A. A 0.1 μF capacitor should be connected be-
tween pin 18 and pin 19, as close as possible to the
LM1253A.
DS101265-5
FIGURE 10. Vertical Flyback Input Pulse
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM1253AN | Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM1253A | Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM1262 | 200 MHz I2C Compatible RGB Video Amplifier System with OSD and DACs |
| LM1262NA | 200 MHz I2C Compatible RGB Video Amplifier System with OSD and DACs |
| LM1267NA | 150 MHz I2C Compatible RGB Video Amplifier System with OSD and DACs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1253A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM1253AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM-1256 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16 x 16 matrix displays |
| LM-1256_1 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16】16 matrix displays |
| LM-1256LB1 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16】16 matrix displays |
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