National Semiconductor - LM3915 Dot Bar Display Driver Data Sheet User Manual
Summary
This versatile monolithic integrated circuit serves as an advanced driver for audio and signal visualization, enabling dot or bar displays using LEDs, LCDs, or fluorescent bulbs. Ideal for instrument designers and engineers, this component handles a wide voltage range (3V to 25V) and utilizes logarithmic measurement across multiple steps (e.g., 3 dB/step). The manual provides detailed specifications on current regulation, cascading capabilities with related ICs, and direct integration into professional meters, power indicators, or data logging systems.
Manual Details
| Brand | National |
|---|---|
| Pages | 25 |
| File Size | 1.03 MB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What types of display systems can the LM3915 interface with?
It can drive LEDs, LCDs, general vacuum fluorescents, or incandescent bulbs.
What is the maximum voltage range for input signals?
The circuit input withstands ±35V without damage or false outputs.
What is the required supply voltage range for operation?
The entire display system can operate from a single supply as low as 3V or as high as 25V.
How can I adjust the internal display format?
One pin changes the display between a bar graph to log display, and it can cascade with LM3916s for an extended-range VU meter.