LX1972A Datasheet, PDF (1/9 Pages) Microsemi Corporation – Ambient Light Detector

LX1972A
TM
®
Ambient Light Detector
PRODUCTION DATA SHEET
DESCRIPTION
The LX1972A is a low cost silicon by placing it in series with a single
light sensor with a spectral response resistor at either of its two pins.
that closely emulates the human eye. Dynamic range is determined by the
Patented circuitry produces peak resistors (typically in the range of 5K to
spectral response at 580nm, with an IR 100K) and the power supply values.
response less than ±5% of the peak Typically the LX1972A needs only
response, above 900nm.
2.7V of headroom to operate at 1000
The photo sensor is a PIN diode Lux illumination.
array with Microsemi’s Best Eye™ Internal temperature compensation
processing that provides a nearly allows dark current to be kept below
perfect photopic light wavelength 200nA over the full specification
response curve. LX1972A provides a temperature range (-40°C to +85°C),
linear, accurate, and very repeatable providing high accuracy at low light
current transfer function. High gain levels. Usable ambient light conditions
current mirrors on the chip multiply range is from 1 to more than 5000 Lux.
the PIN diode photo-current to a The LX1972A is optimized for
sensitivity level that can be voltage controlling back lighting systems in low
scaled with a standard value external cost consumer products such as LCD
resistor. Output current from this TV, portable computers, and digital
simple to use two-pin device can be cameras.
used directly or converted to a voltage
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
V_DD
V_DD
LX1972A
V_SS
1.7V Typical
@ 100 Lux
V_SS
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 Desk Top Monitors
ƒ Notebook Computers
Ambient Light
PACKAGE ORDER INFO
T_A (°C)
Plastic 1206
BC _2-Pin
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)
LX1972A
Copyright © 2005
Rev. 1.0, 2006-09-18
Microsemi
Integrated Products Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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