Dot/Bar Display Driver The LM3915N-1 is a monolithic integrated circuit manufactured by National Semiconductor (NS). Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Manufacturer:** National Semiconductor (NS)
- **Type:** LED Driver (Linear)
- **Function:** Dot/Bar Display Driver
- **Number of Channels:** 10
- **Supply Voltage Range:** 3V to 25V
- **Output Current per Segment:** 10mA to 30mA (adjustable)
- **Reference Voltage Range:** Adjustable (1.2V to 12V)
- **Operating Temperature Range:** 0°C to +70°C
- **Package:** 18-Pin PDIP (Plastic Dual In-Line Package)
### **Descriptions:**
- The LM3915N-1 is designed to drive 10 LEDs in either a **dot mode** (single LED lit) or **bar mode** (progressive illumination) based on an analog input signal.
- It includes an adjustable internal voltage reference, eliminating the need for an external reference in most applications.
- The logarithmic scaling (3dB per step) makes it suitable for audio level meters and other applications requiring a non-linear display.
### **Features:**
- **Logarithmic Display:** 3dB per step scaling for audio applications.
- **Wide Voltage Range:** Operates from 3V to 25V.
- **Internal Voltage Reference:** Adjustable from 1.2V to 12V.
- **Low Standby Current:** Typically 6mA.
- **LED Driver Outputs:** Can sink up to 30mA per LED.
- **Mode Selectable:** Dot or bar display mode via a single pin.
- **Cascadable:** Multiple LM3915s can be connected for extended range.
This information is strictly based on the manufacturer's datasheet and specifications.
