The LM3915 is an integrated circuit that can sense analog voltage levels and drive ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display.
The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum‑fluorescent displays, offering a logarithmic 3 dB/step display. One pin selects between bar‑graph and moving‑dot modes, and the device operates from a single supply as low as 3 V and as high as 25 V.
Key features include programmable LED current from 1 mA to 30 mA, an internal adjustable voltage reference, operation over a temperature range of 0 °C to +70 °C, and a pin‑9 mode‑select function for bar or dot operation. The IC is supplied in a molded dual‑in‑line package (LM3915N‑1) and tolerates input voltages up to ±35 V.
| Supply voltage range | 3 V to 25 V |
|---|---|
| LED current programmable range | 1 mA to 30 mA |
| Input voltage range | ground to V+ – 1.5 V |
| Operating temperature range | 0 °C to +70 °C |
| Maximum input over‑voltage tolerance | ±35 V |
| Standby supply current (all LEDs off) | 1.6 mA |
| Package type | Molded Dual‑In‑Line Package (N) LM3915N‑1 |
It operates from a single supply as low as 3 V up to 25 V.
The device can drive ten LEDs (or LCDs or vacuum‑fluorescent displays).
The input can tolerate voltages up to ±35 V without damage.