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LM3916N Datasheet

  • LM3916N

  • National Semiconductor [Dot/Bar Display Driver]

  • 511.04KB

  • NSC

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LM3916 Dot/Bar Display Driver
January 2000
LM3916
Dot/Bar Display Driver
General Description
The LM3916 is a monolithic integrated circuit that senses
analog voltage levels and drives ten LEDs, LCDs or vacuum
fluorescent displays, providing an electronic version of the
popular VU meter. One pin changes the display from a bar
graph to a moving dot display. LED current drive is regulated
and programmable, eliminating the need for current limiting
resistors. 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
卤
35V. The input buffer drives 10 individual com-
parators referenced to the precision divider. Accuracy is typi-
cally better than 0.2 dB.
Audio applications include average or peak level indicators,
and power 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 interpreta-
tion of an analog display.
The LM3916 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 LM3916 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 for increased range and/or resolu-
tion. Useful in other applications are the linear LM3914 and
the logarithmic LM3915.
Features
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Fast responding electronic VU meter
Drivers LEDs, LCDs, or vacuum fluorescents
Bar or dot display mode externally selectable by user
Expandable to displays of 70 dB
Internal voltage reference from 1.2V to 12V
Operates with single supply of 3V to 25V
Inputs operate down to ground
Output current programmable from 1 mA to 30 mA
Input withstands
卤
35V without damage or false outputs
Outputs are current regulated, open collectors
Directly drives TTL or CMOS
The internal 10-step divider is floating and can be
referenced to a wide range of voltages
The LM3916 is rated for operation from 0藲C to +70藲C. The
LM3916N-1 is available in an 18-lead molded DIP package.
漏 2000 National Semiconductor Corporation
DS007971
www.national.com

LM3916N 产品属性

  • 20

  • 集成电路 (IC)

  • PMIC - 显示器驱动器

  • -

  • LED，LCD，真空荧光

  • 点/条显示器

  • -

  • 10 步

  • 6.1mA

  • 3 V ~ 25 V

  • 0°C ~ 70°C

  • 通孔

  • 18-DIP（0.300"，7.62mm）

  • 18-DIP

  • 管件

  • *LM3916NLM3916

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