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參數(shù)資料
| 型號： | LM3915 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dot/Bar Display Driver |
| 中文描述： | 點(diǎn)/酒吧顯示驅(qū)動程序 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 602K |
| 代理商： | LM3915 |
LM3915
Dot/Bar Display Driver
General Description
The LM3915 is a monolithic integrated circuit that senses
analog voltage levels and drives ten LEDs, LCDs or vacuum
fluorescent displays, providing a logarithmic 3 dB/step ana-
log display. One pin changes the display from a bar graph to
a moving dot display. LED current drive is regulated and pro-
grammable, eliminating the need for current limiting resis-
tors. The whole display system can operate from a single
supply as low as 3V or as high as 25V.
The IC contains an adjustable voltage reference and an ac-
curate ten-step voltage divider. The high-impedance input
buffer accepts signals down to ground and up to within 1.5V
of the positive supply. Further, it needs no protection against
inputs of
±
35V. The input buffer drives 10 individual com-
parators referenced to the precision divider. Accuracy is typi-
cally better than 1 dB.
The LM3915’s 3 dB/step display is suited for signals with
wide dynamic range, such as audio level, power, light inten-
sity or vibration. Audio applications include average or peak
level indicators, power meters and RF signal strength
meters. Replacing conventional meters with an LED bar
graph results in a faster responding, more rugged display
with high visibility that retains the ease of interpretation of an
analog display.
The LM3915 is extremely easy to apply. A 1.2V full-scale
meter requires only one resistor in addition to the ten LEDs.
One more resistor programs the full-scale anywhere from
1.2V to 12V independent of supply voltage. LED brightness
is easily controlled with a single pot.
The LM3915 is very versatile. The outputs can drive LCDs,
vacuum fluorescents and incandescent bulbs as well as
LEDs of any color. Multiple devices can be cascaded for a
dot or bar mode display with a range of 60 or 90 dB.
LM3915s can also be cascaded with LM3914s for a linear/
log display or with LM3916s for an extended-range VU
meter.
Features
n
3 dB/step, 30 dB range
n
Drives LEDs, LCDs, or vacuum fluorescents
n
Bar or dot display mode externally selectable by user
n
Expandable to displays of 90 dB
n
Internal voltage reference from 1.2V to 12V
n
Operates with single supply of 3V to 25V
n
Inputs operate down to ground
n
Output current programmable from 1 mA to 30 mA
n
Input withstands
±
35V without damage or false outputs
n
Outputs are current regulated, open collectors
n
Directly drives TTL or CMOS
n
The internal 10-step divider is floating and can be
referenced to a wide range of voltages
The LM3915 is rated for operation from 0C to +70C. The
LM3915N-1 is available in an 18-lead molded DIP package.
January 2000
L
2000 National Semiconductor Corporation
DS005104
www.national.com
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| LM391N-100 | LM391 Audio Power Driver |
| LM3914VX | LED Display Driver |
| LM391 | LM391 Audio Power Driver |
| LM39301R-3.3 | 3A Low-Voltage Low-Dropout Regulator |
| LM393 | Dual Differential Comparators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3915J/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Display Driver |
| LM3915N | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC LED DISPLAY DRIVER 3915 DIP18 |
| LM3915N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Display Driver |
| LM3915N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Display Driver |
| LM3915N-1 | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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