LM3915N

LM3915N, Dot/Bar Display Driver, 18-DIP, 25V, 10mA, National Semiconductor

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Price:: US $0.20~1.60 / piece [Get Latest Price]

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PartNumber:: LM3915N

Brand:: National Semiconductor - NS | Pack: DIP | D/C: 12+

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Products Upload time: 2012-08-07

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Part Number:LM3915N
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Product Summary

The LM3915N is a Dot/Bar Display Driver. The LM3915N is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog 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 LM3915N 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.

Parametrics

LM3915N absolute maximum ratings: (1)Power Dissipation Molded DIP(N): 1365 mW; (2)Supply Voltage: 25V; (3)Voltage on Output Drivers: 25V; (4)Input Signal Overvoltage: ±35V; (5)Divider Voltage: -100 mV to V+; (6)Reference Load Current: 10 mA; (7)Storage Temperature Range: -55℃ to +150℃; (8)Lead Temperature(Soldering, 10 sec.): 260℃.

Features

LM3915N features: (1)3 dB/step, 30 dB range; (2)Drives LEDs, LCDs, or vacuum fluorescents; (3)Bar or dot display mode externally selectable by user; (4)Expandable to displays of 90 dB; (5)Internal voltage reference from 1.2V to 12V; (6)Operates with single supply of 3V to 25V; (7)Inputs operate down to ground; (8)Output current programmable from 1 mA to 30 mA; (9)Input withstands ±35V without damage or false outputs; (10)Outputs are current regulated, open collectors; (11)Directly drives TTL or CMOS; (12)The internal 10-step divider is floating and can be referenced to a wide range of voltages.