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The LM3914 is an
/ref> * LM3915 – 3 dB
/ref> * LM3916 –
/ref> All the devices in this group operate with a range of voltages of 3–25 V, can drive
LM3914 Datasheet
– Texas Instruments Display drivers Linear integrated circuits
The LM3914 is an integrated circuit
An integrated circuit (IC), also known as a microchip or simply chip, is a set of electronic circuits, consisting of various electronic components (such as transistors, resistors, and capacitors) and their interconnections. These components a ...
(IC), designed by National Semiconductor
National Semiconductor Corporation was an United States of America, American Semiconductor manufacturing, semiconductor manufacturer, which specialized in analogue electronics, analog devices and subsystems, formerly headquartered in Santa Clara, ...
in the late 1970s, used to operate displays that visually show the magnitude
Magnitude may refer to:
Mathematics
*Euclidean vector, a quantity defined by both its magnitude and its direction
*Magnitude (mathematics), the relative size of an object
*Norm (mathematics), a term for the size or length of a vector
*Order of ...
of an analog signal
An analog signal (American English) or analogue signal (British and Commonwealth English) is any continuous-time signal representing some other quantity, i.e., ''analogous'' to another quantity. For example, in an analog audio signal, the ins ...
. It can drive up to 10 LED
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresp ...
s, LCD
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liquid crystals do not em ...
s, or vacuum fluorescent displays
A vacuum fluorescent display (VFD) is a display device once commonly used on consumer electronics equipment such as video cassette recorders, car radios, and microwave ovens.
A VFD operates on the principle of cathodoluminescence, roughly s ...
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.
Features
The LM3914 / LM3915 / LM3916 are identical except for the tenresistor divider
In electronics, a voltage divider (also known as a potential divider) is a passive linear circuit that produces an output voltage (''V''out) that is a fraction of its input voltage (''V''in). Voltage division is the result of distributing the in ...
inside each part.
* LM3914 – linear steps, scaled by a resistor divider consisting of ten 1000 ohm resistors.LM3914 Datasheet; National Semiconductors; 1988./ref> * LM3915 – 3 dB
logarithmic Logarithmic can refer to:
* Logarithm, a transcendental function in mathematics
* Logarithmic scale, the use of the logarithmic function to describe measurements
* Logarithmic spiral,
* Logarithmic growth
* Logarithmic distribution, a discrete pro ...
steps, scaled by a resistor divider consisting of 6630, 4690, 3310, 2340, 1660, 1170, 830, 590, 410, 1000 ohm resistors.LM3915 Datasheet; National Semiconductors; 1988./ref> * LM3916 –
VU-meter
A volume unit (VU) meter or standard volume indicator (SVI) is a device displaying a representation of the signal level in audio equipment.
The original design was proposed in the 1940 IRE paper, ''A New Standard Volume Indicator and Reference L ...
steps, scaled by a resistor divider consisting of 1087, 970, 864, 769, 1298, 1031, 819, 923, 1531, 708 ohm resistors.LM3916 Datasheet; National Semiconductors; 1988./ref> All the devices in this group operate with a range of voltages of 3–25 V, can drive
LED
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresp ...
and VFD displays. 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. R. M. Marston ''Audio IC Users Handbook'' Newnes, 1997 , pp. 177-192 The device is packaged in an 18 pin dual in-line package
In microelectronics, a dual in-line package (DIP or DIL) is an Semiconductor package, electronic component package with a rectangular housing and two parallel rows of electrical connecting pins. The package may be through-hole technology, throu ...
or in a surface mount leadless chip carrier.
See also
*List of LM-series integrated circuits
The following is a list of LM-series integrated circuits. Many were among the first analog integrated circuits commercially produced since late 1965; some were groundbreaking innovations. As of 2007, many are still being used. The LM series orig ...
References
{{ReflistExternal links
LM3914 Datasheet
– Texas Instruments Display drivers Linear integrated circuits