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參數(shù)資料
| 型號： | LM1247 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器512個字符OSD光盤，512個字符RAM和4 DAC的內(nèi)置 |
| 文件頁數(shù)： | 8/48頁 |
| 文件大小： | 3141K |
| 代理商： | LM1247 |
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Typical Performance Characteristics
V
CC
= 5V, T
A
= 25C unless otherwise specified (Continued)
SYSTEM INTERFACE SIGNALS
The Horizontal and Vertical Blanking and the Clamping input signals are important for proper functionality of the LM1247. Both
blanking inputs must be present for OSD synchronization. In addition, the Horizontal blanking input also assists in setting the
proper cathode black level, along with the Clamping pulse. The Vertical blanking input initiates a blanking level at the LM1247
outputs which is programmable from 3 to 127 lines (we recommend at least 10). Both horizontal and vertical blanking can be
individually disabled, if desired.
Figure 2
and
Figure 3
show the case where the Horizontal and Vertical inputs are logic levels.
Figure 2
shows the smaller pin 24
voltage superimposed on the horizontal blanking pulse input to the neck board with R
= 4.7k and C
= 0.1 μF. Note where the
voltage at pin 24 is clamped to about 1 volt when the pin is sinking current.
Figure 3
shows the smaller pin 1 voltage
superimposed on the vertical blanking input to the neck board with C
4
jumpered and R
V
= 4.7k. These component values
correspond to the application circuit of
Figure 9
.
Figure 4
and
Figure 5
show the case where the horizontal and vertical inputs are from deflection.
Figure 4
shows the pin 24
voltage which is derived from a horizontal flyback pulse of 35V peak to peak with R
= 8.2K and C
jumpered.
Figure 5
shows
the pin 1 voltage which is derived from a vertical flyback pulse of 55V peak to peak with C
4
= 1500 pF and R
V
= 120k.
Figure 6
shows the pin 23 clamp input voltage superimposed on the neck board clamp logic input pulse. R
= 1k and should be
chosen to limit the pin 23 voltage to about 2.5V peak to peak. This corresponds to the application circuit given in
Figure 9
.
CATHODE RESPONSE
Figure 7
shows the response at the red cathode for the application circuit in
Figures 9, 10
. The input video risetime is 1.5 ns. The
resulting leading edge has a 7.1 ns risetime and a 7.6% overshoot, while the trailing edge has a 7.1 ns risetime and a 6.9%
overshoot with an LM2467 driver.
ABL GAIN REDUCTION
The ABL function reduces the contrast level of the LM1247 as the voltage on pin 22 is lowered from V
to around 2V.
Figure 8
shows the amount of gain reduction as the voltage is lowered from V
(5.0V) to 2V. The gain reduction is small until V
reaches
the knee anound 3.7V, where the slope increases. Many system designs will require about 3 dB to 5 dB of gain reduction in full
beam limiting. Additional attenuation is possible, and can be used in special circumstances. However, in this case, video
performance such as video linearity and tracking between channels will tend to depart from normal specifications.
OSD PHASE LOCKED LOOP
Table 3
shows the recommended horizontal scan rate ranges (in kHz) for each combination of PLL register setting, 0x843E [1:0],
and the pixels per line register setting, 0x8401 [7:5]. These ranges are recommended for chip ambient temperatures of 25
o
C to
70
o
C. While the OSD PLL will lock for other register combinations and at scan rates outside these ranges, the performance of the
loop will be improved if these recommendations are followed. NR means the combination of PLL and PPL is not recommended
for any scan rate.
20048408
FIGURE 8. ABL Gain Reduction Curve
L
www.national.com
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1247AAG/NA | 功能描述:IC PREAMP CMOS 150MHZ 24DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| LM1247DMC/NA | 制造商:Texas Instruments 功能描述: |
| LM124A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power Quad Operational Amplifiers |
| LM124AD | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER QUAD OPERATIONAL AMPLIFIERS |
| LM124ADR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUADRUPLE OPERATIONAL AMPLIFIERS |
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