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参数资料
| 型号： | LM1247AAG/NA/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封装： | PLASTIC, DIP-24 |
| 文件页数： | 3/48页 |
| 文件大小： | 3141K |
| 代理商： | LM1247AAG/NA/NOPB |
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Pin Descriptions and Application Information (Continued)
Pin
No.
Pin Name
Schematic
Description
19
20
21
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 VBB
and normally keeps D
INT forward biased. When
the current resupplying the CRT capacitance
(averaged by C
ABL) exceeds this limit, then DINT
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 A during scan. C
17 is usually needed for
logic level inputs and should be large enough to
make the time constant, R
HC17 significantly
larger than the horizontal period. R
34 and C8 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.
LM1247
www.national.com
11
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相关代理商/技术参数 |
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|---|---|
| LM1247DMC/NA | 制造商:Texas Instruments 功能描述: |
| LM124A | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Low Power Quad Operational Amplifiers |
| LM124AD | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER QUAD OPERATIONAL AMPLIFIERS |
| LM124ADR | 制造商:TI 制造商全称:Texas Instruments 功能描述:QUADRUPLE OPERATIONAL AMPLIFIERS |
| LM124ADT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
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