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LX1972 Datasheet, PDF (1/9 Pages) Microsemi Corporation – Ambient Light Detector | |||
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LX1972
TM
®
Ambient Light Detector
PRODUCTION SPECIFICATION
DESCRIPTION
The LX1972 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 LX1972 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 LX1972 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 MICROSEMIâs website: http://www.microsemi.com
Protected By U.S.Patents: 6,787,757; Patents Pending
PRODUCT HIGHLIGHT
VDD
VDD
1.2V Typical
@ 100 Lux
LX1972
VSS
VSS
KEY FEATURES
 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
APPLICATIONS
 Portable Electronic Displays
 LCD TV Backlight Systems
 Digital Still Cameras (DSC)
 Desk top Monitors
 Notebook Computers
Ambient Light
PACKAGE ORDER INFO
TA (°C)
Plastic 1206
BC 2-Pin
RoHS Compliant / Pb-free
-40 to 85
LX1972IBC
Note: Available in Tape & Reel. Append the letters âTRâ to
the part number. (i.e. LX1972IBC-TR)
LX1972 Top View
Copyright © 2004
Rev. 1.1b, 2005-10-31
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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