LX1971
I N T E G R A T E D
P R O D U C T S
Wide Range Visible Light Sensor
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1971 is a new technology light
sensor with spectral response that
emulates the human eye; it is pin to pin
compatible to Microsemi鈥檚 LX1970
visible light sensor however with a wider
dynamic range.
This device is ideal for monitoring
ambient light for the control of artificial
lighting, operation of shades, LED
signage and display, street lighting,
automotive light sensors and control of
backlight dimming. It has a unique photo
diode arrangement (patents pending) with
a peak response at 520nm while sharply
attenuating both ultra violet and infrared
wavelengths.
The photo sensor is a PIN diode array
with an accurate and very repeatable
current output.
Photo current is first multiplied by an
integrated high gain amplifier then the
square root is taken of the product of the
amplifier and an internal reference current.
Finally this is further multiplied converted
to current and made available at two
output pins; one a current source and the
other a current sink.
These currents can easily be converted
to voltage by adding a single resistor at
either or both outputs. Voltage gain is
determined by the resistor value typically
in the 5K鈩?to 50K鈩?range.
With accurate internal gain amplifiers
and square root transfer function, design
complexity and cost are greatly reduced.
The LX1971 is available in the Clear 8-
pin MSOP package.
Approximate Human Eye
Spectral Response
Low IR Sensitivity
Highly Accurate &
Repeatable Output Current
vs. Light
Square root transfer function
Temperature Stable
Integrated High Gain Photo
Current Amplifiers
Complementary Current
Outputs
No Optical Filters Needed
BENIFITS
鈥?/div>
Requires no wavelength
filters
鈥?/div>
Insensitive to UV and IR
鈥?/div>
More than 4 decades usable
light range
鈥?/div>
Enables accurate lighting
control systems
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
V
DD
4.7uF
V
DD
25K
SNK
0.60V Typ
SNK
LX1971
SRC
4.7uF
25K
V
OUT
0.45V Typ
SRC
GND
Ambient
Light
LX1971
LX1971
PACKAGE ORDER INFO
Plastic MSOP
T
A
(擄C)
DU
8-Pin
-40 to 85
LX1971IDU
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number. (i.e. LX1971IDUT)
Copyright
錚?/div>
2003
Rev. 1.0,2003-11-25
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
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