LM3915

　　LM3915 Dot/Bar Display Driver

　　Literature Number: SNVS740B

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　　LM3915

　　Dot/Bar Display Driver

　　General Description The LM3915 is very versatile. The outputs can drive LCDs,

　　vacuum fluorescents and incandescent bulbs as well as

　　The LM3915 is a monolithic integrated circuit that senses LEDs of any color. Multiple devices can be cascaded for a

　　analog voltage levels and drives ten LEDs, LCDs or vacuum dot or bar mode display with a range of 60 or 90 dB.

　　fluorescent displays, providing a logarithmic 3 dB/step ana- LM3915s can also be cascaded with LM3914s for a linear/

　　log display. One pin changes the display from a bar graph to log display or with LM3916s for an extended-range VU

　　a moving dot display. LED current drive is regulated and meter.

　　programmable, eliminating the need for current limiting re-

　　sistors. The whole display system can operate from a single Features

　　supply as low as 3V or as high as 25V.

　　n 3 dB/step, 30 dB range

　　The IC contains an adjustable voltage reference and an

　　accurate ten-step voltage divider. The high-impedance input n Drives LEDs, LCDs, or vacuum fluorescents

　　buffer accepts signals down to ground and up to within 1.5V n Bar or dot display mode externally selectable by user

　　of the positive supply. Further, it needs no protection against n Expandable to displays of 90 dB

　　inputs of ±35V. The input buffer drives 10 individual com- n Internal voltage reference from