LM3915N-1/NOPB

TEXAS INSTRUMENTS  LM3915N-1/NOPB  发光二极管驱动器, 10输出, 共阳极, 3V-25V输入, 1.28V/30mA输出, DIP-18

The is a monolithic IC that senses analogue voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3dB/step analogue display. One pin changes the display from a bar graph to a moving dot display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The whole display system can operate from a single supply as low as 3V or as high as 25V. The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. The high-impedance input buffer accepts signals down to ground and up to within 1.5V of the positive supply. Further, it needs no protection against inputs of ±35V. The input buffer drives 10 individual comparators referenced to the precision divider. Accuracy is typically better than 1db.

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3dB/Step, 30dB Range

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Drives LEDs, LCDs or Vacuum Fluorescents

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Bar or Dot Display Mode Externally Selectable by User

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Expandable to Displays of 90dB

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Internal Voltage Reference from 1.2 to 12V

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Inputs Operate Down to Ground

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Output Current Programmable from 1 to 30mA

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Input Withstands ±35V without Damage or False Outputs

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Outputs are Current Regulated, Open Collectors

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Directly Drives TTL or CMOS

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Internal 10-step Divider is Floating and can be Referenced to a Wide Range of Voltages

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Green Product, No Sb/Br

Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.