The LM3915N is a monolithic integrated circuit that senses analog voltage levels and drives up to ten LEDs, LCDs, or vacuum fluorescent displays. It features a logarithmic 3 dB/step scaling ideal for audio VU meters and signal level monitors spanning a 30 dB range.
Key Features & Specifications
- Logarithmic Scaling: Displays 3 dB per step across a 30 dB range, perfect for audio volume visualization.
- Display Modes: Externally selectable between dot (moving single LED) or bar graph display via pin configuration.
- Programmable Current: Regulates LED drive current internally (1 mA to 30 mA), removing the need for external current-limiting resistors.
- Wide Supply Range: Operates on a single power supply from 3V to 25V DC.
- Cascadable: Multiple drivers can be chained together to expand the display range (e.g., up to 90 dB).
- Package Type: Typically housed in an 18-pin molded DIP (dual in-line package).
