LX1971 Datasheet, PDF (1/9 Pages) Microsemi Corporation – Wide Range Visible Light Sensor

INTEGRATED PRODUCTS
LX1971
Wide Range Visible Light Sensor
PRODUCTION DATA SHEET
DESCRIPTION
The LX1971 is a new technology light Photo current is first multiplied by an
sensor with spectral response that integrated high gain amplifier then the
emulates the human eye; it is pin to pin square root is taken of the product of the
compatible to Microsemi’s LX1970 amplifier and an internal reference current.
visible light sensor however with a wider Finally this is further multiplied converted
dynamic range.
to current and made available at two
This device is ideal for monitoring output pins; one a current source and the
ambient light for the control of artificial other a current sink.
lighting, operation of shades, LED These currents can easily be converted
signage and display, street lighting, to voltage by adding a single resistor at
automotive light sensors and control of either or both outputs. Voltage gain is
backlight dimming. It has a unique photo determined by the resistor value typically
diode arrangement (patents pending) with in the 5KΩ to 50KΩ range.
a peak response at 520nm while sharply With accurate internal gain amplifiers
attenuating both ultra violet and infrared and square root transfer function, design
wavelengths.
complexity and cost are greatly reduced.
The photo sensor is a PIN diode array The LX1971 is available in the Clear 8-
with an accurate and very repeatable pin MSOP package.
current output.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ Approximate Human Eye
Spectral Response
ƒ Low IR Sensitivity
ƒ Highly Accurate &
Repeatable Output Current
vs. Light
ƒ Square root transfer function
ƒ Temperature Stable
ƒ Integrated High Gain Photo
Current Amplifiers
ƒ Complementary Current
Outputs
ƒ No Optical Filters Needed
BENIFITS
• Requires no wavelength
filters
• Insensitive to UV and IR
• More than 4 decades usable
light range
• Enables accurate lighting
control systems
V_DD
PRODUCT HIGHLIGHT
4.7uF
V_DD
25K
SNK
SNK
LX1971
4.7uF
V_OUT
SRC
25K
GND
SRC
Ambient
Light
0.60V Typ
0.45V Typ
Copyright  2003
Rev. 1.0,2003-11-25
PACKAGE ORDER INFO
T_A (°C)
Plastic MSOP
DU _8-Pin
-40 to 85
LX1971IDU
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1971IDUT)
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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