- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄30743 > LM1247AAG/NA/NOPB (NATIONAL SEMICONDUCTOR CORP) 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 PDF資料下載
參數(shù)資料
| 型號： | LM1247AAG/NA/NOPB |
| 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(shù)： | 45/48頁 |
| 文件大小： | 3141K |
| 代理商： | LM1247AAG/NA/NOPB |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁當前第45頁第46頁第47頁第48頁
LM1253A and LM1237 Compatibility
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. If datasheet compatibility is not required,
then the DAC assignments can be arbitrary.
TABLE 2. LM1253A/LM1237 Compatibility
DAC Bias Outputs
LM1247 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 LM1247 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 pins, including SDA and SCL. If any signal
other than these two is applied to the LM1247 while the V
CC
is near zero, such as horizontal and vertical deflection pulses
of sufficient amplitude, this protection will activate and pre-
vent any communication on the I
2C bus common to the
LM1247, until the other signal or signals are removed. Nor-
mally, with all other pins unenergized, the LM1247 will not
affect I
2C communication when it is powered down.
LM1247
www.national.com
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LM1279AN/NOPB | 3 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LM124ADT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
發(fā)布緊急采購，3分鐘左右您將得到回復。