LX1970_08 Datasheet, PDF (1/10 Pages) Microsemi Corporation – Visible Light Sensor

INTEGRATED PRODUCTS
Visible Light Sensor
PRODUCTION DATA SHEET
LX1970
DESCRIPTION
The LX1970 is a new technology light Photo current is multiplied by
sensor with spectral response that integrated high gain amplifiers and is
emulates the human eye.
made available at two output pins; one a
This device is ideal for monitoring current source and the other a current sink.
ambient light for brightness control These currents can easily be converted
systems in flat panel displays. It has a to voltage by adding a single resistor at
unique photo diode arrangement (patents either or both outputs. Voltage gain is
pending) with a peak response at 520 nm determined by the resistor value typically
while sharply attenuating both ultra violet in the 10KΩ to 50KΩ range.
and infrared wavelengths.
With accurate internal gain amplifiers,
The photo sensor is a PIN diode array design complexity and cost are greatly
with an accurate, linear, and very reduced.
repeatable current transfer function.
The LX1970 is available in the 8-pin
MSOP.
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 FEATURES
ƒ Approximate Human Eye
Spectral Response
ƒ Low IR Sensitivity
ƒ Highly Accurate &
Repeatable Output Current
vs. Light
ƒ Voltage Scalable
ƒ Temperature Stable
ƒ Integrated High Gain Photo
Current Amplifiers
ƒ Complementary Current
Outputs
ƒ No Optical Filters Needed
APPLICATIONS
ƒ PDA
ƒ Notebook PC
ƒ LCD TV
ƒ Tablet PC
ƒ Cell phones
V_DD
PRODUCT HIGHLIGHT
4.7uF
V_DD
50K
SNK
I _SNK
0.3V Typ
LX1970
4.7uF
V_OUT
SRC
50K
GND
I _SRC
A m bie nt
Light
0.3V TYP
Copyright © 2007
Rev. 1.5b, 2008-01-25
PACKAGE ORDER INFO
T_A (°C)
Plastic MSOP
DU _8-Pin
RoHS Compliant / Pb-free
-40 to 85
LX1970IDU
Note: Available in Tape & Reel. Append the letters “TR” to
the part number. (i.e. LX1970IDU-TR)
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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