LM3915 Overview
The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display. One pin changes the display from a bar graph to a moving dot display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors.
LM3915 Key Features
- 2 3 dB/step, 30 dB Range
- Drives LEDs, LCDs, or Vacuum Fluorescents
- Bar or Dot Display Mode Externally Selectable
- Expandable to Displays of 90 dB
- Internal Voltage Reference from 1.2V to 12V
- Operates with Single Supply of 3V to 25V
- Inputs Operate Down to Ground
- Output Current Programmable from 1 mA to 30
- Input Withstands ±35V without Damage or
- Outputs are Current Regulated, Open
