LX1974 Datasheet, PDF (1/9 Pages) Microsemi Corporation – Ambient Light Detector

LX1974
TM
®
Ambient Light Detector
PRODUCTION DATA SHEET
DESCRIPTION
The LX1974 is a low cost silicon Dynamic range is determined by the
light sensor with spectral response that resistors (typically in the range of 10K
closely emulates the human eye.
to 100K) and power supply values.
Patented circuitry produces peak Typically the LX1974 needs only 1.8V
spectral response at 520nm, with IR of headroom to operate at 1000 Lux
response less than ±5%, of the peak illumination.
response, above 900nm.
Internal temperature compensation
The photo sensor is a PIN diode array allows dark current to be kept below
with a linear, accurate, and very 200nA over the full specification
repeatable current transfer function. temperature range (-40 to +85°C),
High gain current mirrors on the chip providing high accuracy at low light
multiply the PIN diode photo-current levels. Usable ambient light conditions
to a sensitivity level that can be range is from 1 to more than 5000 Lux.
voltage scaled with a standard value The LX1974 is optimized for
external resistor. Output current from controlling back lighting systems in low
this simple to use two-pin device can cost consumer products such as LCD
be used directly or converted to a TV, portable computers, and digital
voltage by placing it in series with a cameras.
single resistor at either of its two pins.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By U.S.Patents: 6,787,757; Patents Pending
PRODUCT HIGHLIGHT
KEY FEATURES
ƒ Near Human Eye Spectral
Response
ƒ Very Low IR Sensitivity
ƒ Highly Accurate & Repeatable
Output Current vs. Light
ƒ Scalable Output Voltage
ƒ Temperature Stable
ƒ Integrated High Gain Photo
Current Amplifiers
ƒ No Optical Filters Needed
APPLICATIONS
ƒ Portable Electronic Displays
ƒ LCD TV Backlight Systems
ƒ Digital Still Cameras (DSC)
ƒ Desktop Monitors
ƒ Notebook Computers
LX1974
LIGHT
Copyright © 2005
Rev. 1.0, 2006-05-09
PACKAGE ORDER INFO
T_A (°C)
Plastic 1206
BC _2-Pin
RoHS Compliant / Pb-free
-40 to 85
LX1974IBC
Note: Available in Tape & Reel. Append the
letters “TR” to the part number.
(i.e. LX1974IBC-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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