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LM3915 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3915 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 31 page  LM3915 www.ti.com SNVS740C – JANUARY 2000 – REVISED MARCH 2013 LM3915 Dot/Bar Display Driver Check for Samples: LM3915 1 FEATURES DESCRIPTION The LM3915 is a monolithic integrated circuit that 2 • 3 dB/step, 30 dB Range senses analog voltage levels and drives ten LEDs, • Drives LEDs, LCDs, or Vacuum Fluorescents LCDs or vacuum fluorescent displays, providing a • Bar or Dot Display Mode Externally Selectable logarithmic 3 dB/step analog display. One pin by User changes the display from a bar graph to a moving dot display. LED current drive is regulated and • Expandable to Displays of 90 dB programmable, eliminating the need for current • Internal Voltage Reference from 1.2V to 12V limiting resistors. The whole display system can • Operates with Single Supply of 3V to 25V operate from a single supply as low as 3V or as high as 25V. • Inputs Operate Down to Ground • Output Current Programmable from 1 mA to 30 The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. The high- mA impedance input buffer accepts signals down to • Input Withstands ±35V without Damage or ground and up to within 1.5V of the positive supply. False Outputs Further, it needs no protection against inputs of ±35V. • Outputs are Current Regulated, Open The input buffer drives 10 individual comparators Collectors referenced to the precision divider. Accuracy is typically better than 1 dB. • Directly Drives TTL or CMOS • The Internal 10-step Divider is Floating and The LM3915's 3 dB/step display is suited for signals with wide dynamic range, such as audio level, power, can be Referenced to a Wide Range of light intensity or vibration. Audio applications include Voltages average or peak level indicators, power meters and The LM3915 is Rated for Operation from 0°C to RF signal strength meters. Replacing conventional +70°C. The LM3915N-1 is Available in an 18- meters with an LED bar graph results in a faster lead PDIP Package. 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. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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