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參數資料
| 型號： | LM1246AAA/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數： | 49/51頁 |
| 文件大?。?/td> | 2794K |
| 代理商： | LM1246AAA/NA |
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Compatibility with LM1237 and
LM1247 (Continued)
The Compatibility of the LM1246 to the LM1237 and
LM1253A is the same as that of the LM1247. Please refer to
the LM1247 datasheet for details.
In order to maintain register compatibility with the LM1253A
and LM1237 preamplifier datasheet assignments for bias
and brightness, the color assignments are recommended as
shown in Table 2. LM1253A/LM1237 Compatibility.If
datasheet compatibility is not required, then the DAC assign-
ments can be arbitrary.
TABLE 2. LM1253A/LM1237 Compatibility
DAC Bias Outputs
LM1246 Pin:
DAC 1
DAC 2
DAC 3
DAC 4
Assignment:
Blue
Green
Red
Brightness
OSD vs Video Intensity
The OSD amplitude has been increased over the LM1237
level. During monitor alignment, the three gain registers are
used to achieve the desired front of screen color balance.
This also causes the OSD channels to be adjusted accord-
ingly, since these are inserted into the video channels prior
to the gain attenuators. This provides the means to fine tune
the intensity of the OSD relative to the video as follows. If a
typical starting point for the alignment is to have the gains at
maximum (0x7F) and the contrast at 0x55, the resultant
OSD intensity will be higher than if the starting point is with
the gains at 0x55 and the contrast at maximum (0x7F). This
tradeoff allows fine tuning the final OSD intensity relative to
the video. In addition, the OSD contrast register, 0x8438
[4:3], provides 4 major increments of intensity. Together,
these allow setting the OSD intensity to the most pleasing
level.
ESD Protection
The LM1246 features a 3.0 kV ESD protection level (see
(Notes 4, 13)). This is provided by special internal circuitry
which activates when the voltage at any pin goes beyond the
supply rails by a preset amount. At that time, the protection is
applied to all the pins, including SDA and SCL.
LM1246
www.national.com
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相關PDF資料 |
PDF描述 |
|---|---|
| LM1247AAG/NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1253AAE/NA | ON-SCREEN DISPLAY IC, PDIP28 |
| LM1267NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1269NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1276AAA/NA | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1246AAC/NA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:IC 150MHZ RGB PREAMP 1246 DIP24 |
| LM1246AAC/NA/NOPB | 功能描述:IC PREAMP RGB 150MHZ 24-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用: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 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| LM1246NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1247 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 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:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用: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 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
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