LM3915
LM3915 Dot/Bar Display Driver
Literature Number: SNVS740B
/
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