Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3915N Datenblatt(PDF) 1 Page - National Semiconductor (TI) |
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LM3915N Datenblatt(HTML) 1 Page - National Semiconductor (TI) |
1 / 25 page LM3915 Dot/Bar Display Driver General Description The LM3915 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 ana- log 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 re- sistors. 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 com- parators referenced to the precision divider. Accuracy is typically better than 1 dB. The LM3915’s 3 dB/step display is suited for signals with wide dynamic range, such as audio level, power, light inten- sity or vibration. Audio applications include average or peak level indicators, power meters and RF signal strength meters. Replacing conventional meters with an LED bar graph results in a faster responding, more rugged display with high visibility that retains the ease of interpretation of an analog display. The LM3915 is extremely easy to apply. A 1.2V full-scale meter requires only one resistor in addition to the ten LEDs. One more resistor programs the full-scale anywhere from 1.2V to 12V independent of supply voltage. LED brightness is easily controlled with a single pot. The LM3915 is very versatile. The outputs can drive LCDs, vacuum fluorescents and incandescent bulbs as well as LEDs of any color. Multiple devices can be cascaded for a dot or bar mode display with a range of 60 or 90 dB. LM3915s can also be cascaded with LM3914s for a linear/ log display or with LM3916s for an extended-range VU meter. Features n 3 dB/step, 30 dB range n Drives LEDs, LCDs, or vacuum fluorescents n Bar or dot display mode externally selectable by user n Expandable to displays of 90 dB n Internal voltage reference from 1.2V to 12V n Operates with single supply of 3V to 25V n Inputs operate down to ground n Output current programmable from 1 mA to 30 mA n Input withstands ±35V without damage or false outputs n Outputs are current regulated, open collectors n Directly drives TTL or CMOS n The internal 10-step divider is floating and can be referenced to a wide range of voltages The LM3915 is rated for operation from 0˚C to +70˚C. The LM3915N-1 is available in an 18-lead molded DIP package. February 2001 © 2004 National Semiconductor Corporation DS005104 www.national.com |
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