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LX1972A Datasheet(PDF) 1 Page - Microsemi Corporation |
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LX1972A Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 9 page LX1972A PRODUCTION DATA SHEET Microsemi Integrated Products Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 Ambient Light Detector Copyright © 2005 Rev. 1.0, 2006-09-18 TM ® DESCRIPTION The LX1972A is a low cost silicon light sensor with a spectral response that closely emulates the human eye. Patented circuitry produces peak spectral response at 580nm, with an IR response less than ±5% of the peak response, above 900nm. The photo sensor is a PIN diode array with Microsemi’s Best Eye™ processing that provides a nearly perfect photopic light wavelength response curve. LX1972A provides a linear, accurate, and very repeatable current transfer function. High gain current mirrors on the chip multiply the PIN diode photo-current to a sensitivity level that can be voltage scaled with a standard value external resistor. Output current from this simple to use two-pin device can be used directly or converted to a voltage by placing it in series with a single resistor at either of its two pins. Dynamic range is determined by the resistors (typically in the range of 5K to 100K) and the power supply values. Typically the LX1972A needs only 2.7V of headroom to operate at 1000 Lux illumination. Internal temperature compensation allows dark current to be kept below 200nA over the full specification temperature range (-40°C to +85°C), providing high accuracy at low light levels. Usable ambient light conditions range is from 1 to more than 5000 Lux. The LX1972A is optimized for controlling back lighting systems in low cost consumer products such as LCD TV, portable computers, and digital cameras. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Protected By U.S. Patents: 6,787,757; Patents Pending KEY FEATUR ES Near Human Eye Spectral Response Very Low IR Sensitivity Highly Accurate & Repeatable Output Current vs. Light Scalable Output Voltage Temperature Stable Integrated High Gain Photo Current Amplifiers No Optical Filters Needed APPLI C ATION S Portable Electronic Displays LCD TV Backlight Systems Digital Still Cameras (DSC) Desk Top Monitors Notebook Computers PRODUCT H I GHLIGHT VDD VSS 1.7V Typical @ 100 Lux VDD VSS Ambient Light LX1972A LX1972A PACKAGE ORDER INFO BC Plastic 1206 2-Pin TA (°C) RoHS Compliant / Pb-free -40 to 85 LX1972AIBC Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1972AIBC-TR) |
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