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Features
Description
The National Semiconductor LM3914N-1 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V. The circuit contains its own adjustable reference and accurate 10-step voltage divider. The low- bias-current input buffer accepts signals down to ground, or V−, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non- linearity can thus be held typically to ½%, even over a wide temperature range. Versatility was designed into the LM3914 so that controller, visual alarm, and expanded scale functions are easily added on to the display system. The circuit can drive LEDs of many colors, or low-current incandescent lamps. Many LM3914s can be “chained” to form displays of 20 to over 100 segments. Both ends of the voltage divider are externally available so that 2 drivers can be made into a zero-center meter. The LM3914 is very easy to apply as an analog meter circuit. A 1.2V full-scale meter requires only 1 resistor and a single 3V to 15V supply in addition to the 10 display LEDs. If the 1 resistor is a pot, it becomes the LED brightness control. When in the dot mode, there is a small amount of overlap or “fade” (about 1 mV) between segments. This assures that at no time will all LEDs be “OFF”, and thus any ambiguous display is avoided. Various novel displays are possible. Much of the display flexibility derives from the fact that all outputs are individual, DC regulated currents. Various effects can be achieved by modulating these currents. The individual outputs can drive a transistor as well as a LED at the same time, so controller functions including “staging” control can be performed. The LM3914 can also act as a programmer, or sequencer. The National Semiconductor LM3914 is rated for operation from 0°C to +70°C. The LM3914N-1 is available in an 18-lead PDIP (NFK) package. Juried Engineering Products are shipped in Trademarked ESD Safe Packaging with Detail Labels and are Authentic/Genuine Brand Name Components. Other sellers components are of unknown origin, cannot be validated for Authenticity and not authorized to sell on this listing. National Semiconductor LM3914N-1 LM3914 Dot Bar-Graph Display Driver Built-in Regulated and programmable LED Current Drive eliminating the need for resistors DIP-18 Breadboard-Friendly (Pack of 10) Drives LEDs, LCDs or Vacuum FluorescentsBar or Dot Display Mode Externally Selectable by UserInput Withstands ±35V without Damage or False Outputs Expandable to Displays of 100 StepsInternal Voltage Reference from 1.2V to 12VOutputs can Interface with TTL or CMOS Logic Operates with Single Supply of Less than 3VInputs Operate Down to GroundLED Driver Outputs are Current Regulated, Open-collectors Output Current Programmable from 2 mA to 30 mANo Multiplex Switching or Interaction Between OutputsThe Internal 10-step Divider is Floating and can be Referenced to a Wide Range of Voltages Read more LM3914N-1 Typical Application Example: 0V to 5V Bar Graph Meter LM3914N-1 BLOCK DIAGRAM (Showing Simplest Application) LM3914N-1 Supply Current vs Temperature
Is Discontinued By Manufacturer : No
Item model number : LM3914N-1/NOPB
Date First Available : April 26, 2018
Manufacturer : National Semiconuctor
Best Sellers Rank: #141,329 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #179 in Communication Integrated Circuits
#179 in Communication Integrated Circuits:
Customer Reviews: 4.7 out of 5 stars 16 ratings
