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参数资料
| 型号： | LM1276AAA/NA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 6/50页 |
| 文件大小： | 6075K |
| 代理商： | LM1276AAA/NA |
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Pin
No.
Pin Name
Schematic
Description
23
24
25
Green Output
Red Output
Blue Output
These are the three video output pins. They are
intended to drive the LM2476 and LM246X family of
cathode drivers. Nominally, about 2V peak to peak will
produce 40V peak to peak of cathode drive.
26
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 26 begins to drop. The
LM1276 then lowers the gain of the three video
channels until the beam current reaches an
equilibrium value.
27
CLAMP
This pin accepts either TTL or CMOS logic levels. This
pin can also be internally connected to the Horizontal
sync pin. The internal switching threshold is
approximately one-half of V
CC. An external series
resistor, R, of about 1k is recommended to avoid
overdriving the input devices. In any event, R must be
large enough to prevent the voltage at pin 27 from
going higher than V
CC or below GND.
28
H Flyback
Proper operation requires current reversal. R
H should
be large enough to limit the peak current at pin 28 to
about +4 mA during blanking, and 500 A during
scan. C
1 is usually needed for logic level inputs and
should be large enough to make the time constant,
R
HC1 significantly larger than the horizontal period.
R
1 and C2 are typically 300 and 330 pF when the
flyback waveform has ringing and needs filtering. C
3
may be needed to filter extraneous noise and can be
up to 100 pF.
www.national.com
14
200969 Version 2 Revision 4
Print Date/Time: 2011/07/11 11:20:12
LM1276
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1279 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:110 MHz RGB Video Amplifier System with OSD |
| LM12791DL WAF | 制造商:Texas Instruments 功能描述: |
| LM1279A | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| LM1279AN | 功能描述:IC AMP RGB VIDEO SYSTEM 20-DIP RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LM1279DL WAF | 制造商:Texas Instruments 功能描述: |
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