LM3915 - Dot/Bar Display Driver [Original]

LM3915 Logarithmic Dot/Bar Display Driver IC

The LM3915 is a monolithic integrated circuit for analog display applications. It senses analog voltage levels and drives up to ten LEDs, LCDs, or vacuum fluorescent displays. This IC provides a logarithmic 3 dB/step analog display. Display modes are selectable between moving dot and bar graph via a single pin. It includes regulated and programmable LED current drive, eliminating external current limiting resistors. The device operates from a single supply voltage range of 3V to 25V. An integrated adjustable voltage reference and a ten-step voltage divider are included. Input protection handles ±35V without damage.

Specifications:

• Display Type: Logarithmic 3dB/step
• Output Channels: 10
• Display Modes: Dot, Bar
• Supply Voltage Range: 3V to 25V
• Input Voltage Protection: ±35V
• Output Current Range: 1 mA to 30 mA (programmable)
• Internal Voltage Reference: 1.2V to 12V (adjustable)
• Accuracy: Typically better than 1 dB
• Output Type: Current regulated, open collectors
• Compatibility: TTL, CMOS

Key features and benefits:

• Logarithmic 3dB analog display output
• Drives LEDs, LCDs, or vacuum fluorescent displays
• Selectable bar graph or moving dot display mode
• Expandable to 100 steps
• Single supply operation: 3V to 25V
• Programmable output current: 1 mA to 30 mA
• Input protection: Withstands ±35V
• Current regulated, open collector outputs

Applications:

• Audio Level Indicators (VU meters)
• Battery Charge/Discharge Monitors
• Power Supply Voltage Indicators
• Signal Strength Meters
• Temperature Monitors with analog output
• Industrial Control Panel Displays

Frequently Asked Questions:

Q: What is the operating voltage range for the LM3915?
A: The LM3915 operates from a single supply voltage range of 3V to 25V.

Q: Does the LM3915 require external current limiting resistors for LEDs?
A: No, the LM3915 includes regulated and programmable LED current drive, eliminating the need for external current limiting resistors.

Q: How are the dot and bar graph display modes selected?
A: Display modes are selected via a single pin, allowing switching between dot and bar graph modes.

Q: Can the LM3915 be used for displays with more than 10 steps?
A: Yes, the LM3915 is expandable to drive displays up to 100 steps.

Q: What input voltage protection does the LM3915 offer?
A: The LM3915 provides input protection, safely handling inputs of ±35V without damage.

Package Includes:

*Image shown is a representation only.

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