The LM3914 is an integrated circuit (IC), designed by National Semiconductor in the late 1970s, used to operate displays that visually show the magnitude of an analog signal.[1] It 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.[1]
LM3914 driving an LEDbargraph displayLM3915 IC in DIP-18 package
The LM3914 / LM3915 / LM3916 are identical except for the ten resistor divider inside each part.
LM3914 - linear steps, scaled by a resistor divider consisting of ten 1000 ohm resistors.[1]
LM3915 - 3dBlogarithmic steps, scaled by a resistor divider consisting of 6630, 4690, 3310, 2340, 1660, 1170, 830, 590, 410, 1000 ohm resistors.[2]
LM3916 - VU-meter steps, scaled by a resistor divider consisting of 1087, 970, 864, 769, 1298, 1031, 819, 923, 1531, 708 ohm resistors.[3]
All the devices in this group operate with a range of voltages from 3-25 V, can drive LED and VFD displays.[4] They can provide a regulated output current between 2-30 mA to directly drive displays.
Internally, each device contains ten comparators and a resistor scaling network, as well as a 1.25 volt reference source. As the input voltage increases, each comparator turns on. The device can be configured for either a bar-graph mode, where all lower-output terminals switch on, or "dot" mode in which only one output goes on. [5] The device is packaged in an 18 pin dual in-line package or in a surface mount leadless chip carrier.
^Note that the voltage measured has to be no closer than about 1.5-2.0V to supply voltage rail.
^R. M. Marston Audio IC Users Handbook Newnes, 1997 ISBN0080572634, pp. 177-192
External linksedit
LM3914 Datasheet - Texas Instruments
December 12, 2023
lm3914, integrated, circuit, designed, national, semiconductor, late, 1970s, used, operate, displays, that, visually, show, magnitude, analog, signal, drive, leds, lcds, vacuum, fluorescent, displays, outputs, linear, scaling, output, thresholds, makes, device. The LM3914 is an integrated circuit IC designed by National Semiconductor in the late 1970s used to operate displays that visually show the magnitude of an analog signal 1 It 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 1 LM3914 driving an LED bargraph displayLM3915 IC in DIP 18 package Contents 1 Features 2 See also 3 References 4 External linksFeatures editThe LM3914 LM3915 LM3916 are identical except for the ten resistor divider inside each part LM3914 linear steps scaled by a resistor divider consisting of ten 1000 ohm resistors 1 LM3915 3dB logarithmic steps scaled by a resistor divider consisting of 6630 4690 3310 2340 1660 1170 830 590 410 1000 ohm resistors 2 LM3916 VU meter steps scaled by a resistor divider consisting of 1087 970 864 769 1298 1031 819 923 1531 708 ohm resistors 3 All the devices in this group operate with a range of voltages from 3 25 V can drive LED and VFD displays 4 They can provide a regulated output current between 2 30 mA to directly drive displays Internally each device contains ten comparators and a resistor scaling network as well as a 1 25 volt reference source As the input voltage increases each comparator turns on The device can be configured for either a bar graph mode where all lower output terminals switch on or dot mode in which only one output goes on 5 The device is packaged in an 18 pin dual in line package or in a surface mount leadless chip carrier See also editList of LM series integrated circuitsReferences edit a b c LM3914 Datasheet National Semiconductors 1988 LM3915 Datasheet National Semiconductors 1988 LM3916 Datasheet National Semiconductors 1988 Note that the voltage measured has to be no closer than about 1 5 2 0V to supply voltage rail R M Marston Audio IC Users Handbook Newnes 1997 ISBN 0080572634 pp 177 192External links editLM3914 Datasheet Texas Instruments Retrieved from https en wikipedia org w index php title LM3914 amp oldid 1175909574, wikipedia, wiki, book, books, library,
