LM3915N DIP-18 analog lysdioddrivare

Dot/Bar Display Driver

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 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.

Features

* 3 dB/step, 30 dB range

* Drives LEDs, LCDs, or vacuum fluorescents

* Bar or dot display mode externally selectable by user

* Expandable to displays of 90 dB

* Internal voltage reference from 1.2V to 12V

* Operates with single supply of 3V to 25V

* Inputs operate down to ground

* Output current programmable from 1 mA to 30 mA

* Input withstands +/-35V without damage or false outputs

* Outputs are current regulated, open collectors

* Directly drives TTL or CMOS

* The internal 10-step divider is floating and can be referenced to a wide range of voltages