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LM3915 Datasheet(PDF) 1 Page - Texas Instruments

Part No. LM3915
Description  LM3915 Dot/Bar Display Driver
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3915 Datasheet(HTML) 1 Page - Texas Instruments

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LM3915
www.ti.com
SNVS740C – JANUARY 2000 – REVISED MARCH 2013
LM3915 Dot/Bar Display Driver
Check for Samples: LM3915
1
FEATURES
DESCRIPTION
The LM3915 is a monolithic integrated circuit that
2
3 dB/step, 30 dB Range
senses analog voltage levels and drives ten LEDs,
Drives LEDs, LCDs, or Vacuum Fluorescents
LCDs or vacuum fluorescent displays, providing a
Bar or Dot Display Mode Externally Selectable
logarithmic
3
dB/step
analog
display.
One
pin
by User
changes the display from a bar graph to a moving dot
display.
LED
current
drive
is
regulated
and
Expandable to Displays of 90 dB
programmable, eliminating the need for current
Internal Voltage Reference from 1.2V to 12V
limiting resistors. The whole display system can
Operates with Single Supply of 3V to 25V
operate from a single supply as low as 3V or as high
as 25V.
Inputs Operate Down to Ground
Output Current Programmable from 1 mA to 30
The IC contains an adjustable voltage reference and
an accurate ten-step voltage divider. The high-
mA
impedance input buffer accepts signals down to
Input Withstands ±35V without Damage or
ground and up to within 1.5V of the positive supply.
False Outputs
Further, it needs no protection against inputs of ±35V.
Outputs are Current Regulated, Open
The input buffer drives 10 individual comparators
Collectors
referenced to the precision divider. Accuracy is
typically better than 1 dB.
Directly Drives TTL or CMOS
The Internal 10-step Divider is Floating and
The LM3915's 3 dB/step display is suited for signals
with wide dynamic range, such as audio level, power,
can be Referenced to a Wide Range of
light intensity or vibration. Audio applications include
Voltages
average or peak level indicators, power meters and
The LM3915 is Rated for Operation from 0°C to
RF signal strength meters. Replacing conventional
+70°C. The LM3915N-1 is Available in an 18-
meters with an LED bar graph results in a faster
lead PDIP Package.
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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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