Kategori: IC LM LF


LM3915 LM3915N LM3915 N LM 3915 LM 3915 N
 

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 analog
display. 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
accurate 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 comparators
referenced to the precision divider. Accuracy is
typically better than 1 dB.


The LM3915s 3 dB/step display is suited for signals with
wide dynamic range, such as audio level, power, light intensity
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

 

 

The LM3914 is an integrated circuit (IC) designed by National Semiconductor and used to operate displays that visually show the magnitude of an analog signal.

One LM3914 can drive up to 10 LEDs, LCDs, or vacuum fluorescent displays on its outputs. The linear scaling of the output thresholds makes the device usable, for example, as a voltmeter. In the basic configuration it provides a ten step scale which is expandable to over 100 segments with other LM3914 ICs in series.

This IC was introduced by National Semiconductor in 1980 and is still available as of 2013 from Texas Instruments. There are also two variants of it produced, the only difference being using 3dB logarithmic (LM3915)[1] or VU-meter (LM3916)[2] scale.

 

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