LM3914V Dot/Bar Display Driver - Texas Instruments

The LM3914V from Texas Instruments 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 of the key factors behind the popularity of the LM3914V as it simplifies the design and enhances reliability.

Designed to operate with a single supply of less than 3V or as high as 25V, the LM3914V is versatile in its application. The device is capable of driving both LEDs and LCDs, and the LED driver outputs are current regulated, open-collectors. This means the LM3914V can interface with a variety of peripherals or can be used in simple projects and complex monitoring systems alike.

The LM3914V can be used in a wide range of applications, including battery monitors, fluid levels, and audio applications. Its ability to provide a visual display of voltage levels makes it ideal for creating power indicators or for monitoring audio levels in mixers or amplifiers.

Key features of the LM3914V include:

• Drives LEDs, LCDs, or vacuum fluorescents
• Bar or dot display mode externally selectable by the user
• Internal voltage reference from 1.2V to 12V
• Operates with single supply of less than 3V
• Inputs operate down to ground
• Output current programmable from 2 mA to 30 mA
• No multiplex switching or interaction between outputs
• Available in various packages including PLCC and DIP

Overall, the LM3914V is a robust, reliable, and easy-to-use display driver that simplifies the addition of visual voltage level indication to a wide variety of electronic projects. Texas Instruments' commitment to quality ensures that the LM3914V is a solid choice for both hobbyists and professional engineers looking to add a sleek, linear display to their designs.