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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)： | 11/48頁 |
| 文件大小： | 3141K |
| 代理商： | LM1247 |
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Pin Descriptions and Application Information
(Continued)
Pin
No.
19
20
21
Pin Name
Schematic
Description
Green Output
Red Output
Blue Output
These are the three video output pins. They are
intended to drive the LM246x family of cathode
drivers. Nominally, about 2V peak to peak will
produce 40V peak to peak of cathode drive.
22
ABL
The Automatic Beam Limiter input is biased to
the desired beam current limit by R
ABL
and V
BB
and normally keeps D
INT
forward biased. When
the current resupplying the CRT capacitance
(averaged by C
ABL
) exceeds this limit, then D
INT
begins to turn off and the voltage at pin 22
begins to drop. The LM1247 then lowers the
gain of the three video channels until the beam
current reaches an equilibrium value.
23
CLAMP
This pin accepts either TTL or CMOS logic
levels. The internal switching threshold is
approximately one-half of V
CC
. An external
series resistor, R
31
, of about 1K is
recommended to avoid overdriving the input
devices. In any event, R
EXT
must be large
enough to prevent the voltage at pin 23 from
going higher than V
CC
or below GND.
24
H Flyback
Proper operation requires current reversal. R
H
should be large enough to limit the peak current
at pin 24 to about +4 ma during blanking, and
500 μA during scan. C
17
is usually needed for
logic level inputs and should be large enough to
make the time constant, R
H
C
17
significantly
larger than the horizontal period. R
34
and C
8
are
typically 300
and 330 pF when the flyback
waveform has ringing and needs filtering. C
18
may be needed to filter extraneous noise and
can be up to 100 pF.
L
www.national.com
11
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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(jī)，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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