LX1974
®
Ambient Light Detector
TM
PRODUCTION DATA SHEET
KEY FEATURES
DESCRIPTION
Near Human Eye Spectral
Response
The LX1974 is a low cost silicon
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.
Dynamic range is determined by the
Very Low IR Sensitivity
Highly Accurate & Repeatable
Output Current vs. Light
Scalable Output Voltage
Temperature Stable
Integrated High Gain Photo
Current Amplifiers
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.
No Optical Filters Needed
APPLICATIONS
Portable Electronic Displays
LCD TV Backlight Systems
Digital Still Cameras (DSC)
Desktop Monitors
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.
Notebook Computers
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
LX1974
LIGHT
PACKAGE ORDER INFO
Plastic 1206
2-Pin
BC
TA (°C)
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)
Copyright © 2005
Rev. 1.0, 2006-05-09
Microsemi
Page 1
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570