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PDF LX1970 Data sheet ( Hoja de datos )
| Número de pieza | LX1970 | |
| Descripción | Visible Light Sensor | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LX1970 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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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
Approximate Human Eye
Spectral Response
Low IR Sensitivity
Highly Accurate &
Repeatable Output Current
vs. Light
Voltage Scalable
Temperature Stable
Integrated High Gain Photo
Current Amplifiers
Complementary Current
Outputs
No Optical Filters Needed
APPLICATIONS
PDA
Notebook PC
LCD TV
Tablet PC
Cell phones
VDD
PRODUCT HIGHLIGHT
4.7uF
VDD
50K
SNK
I SNK
0.3V Typ
LX1970
4.7uF
VOUT
SRC
50K
GND
I SRC
A m bie nt
Light
0.3V TYP
Copyright © 2002
Rev. 1.4b, 2005-08-10
DataSheet4 U .com
PACKAGE ORDER INFO
TA (°C)
-40 to 85
Plastic MSOP
DU 8-Pin
RoHS Compliant / Pb-free
LX1970IDU
Note: Available in Tape & Reel. Append the letters “TR” to
the part number. (i.e. LX1970IDU-TR)
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
www.DataSheet4U.com
INTEGRATED PRODUCTS
Visible Light Sensor
PRODUCTION DATA SHEET
LX1970
APPLICATION INFORMATION
The LX1970 is a light sensor with a spectral response
that resembles the human visual system. It is packaged in
clear MSOP package. Microsemi also offers the LX1971
with the same pin out and similar supply voltage range as
LX1970 light sensor. The LX1971 responsiveness
however differs from that of the LX1970. In general the
LX1971 has lower sensitivity and a wider dynamic range.
The LX1970 has a responsiveness that is directly
proportional to the intensity of light falling on the photo
receptors. Although the gain varies depending on the
wavelength of the light and the direction of light, in general
for a 555nm wavelength (yellow-green), the sensitivity is:
IOUT = L × 0.76µA for L < 1200 lux
The LX1970 is best suited for applications where the
light sensor is an integral part of a continuous lighting
control system. For example, in an LCD backlighting
application, the level of brightness of the backlight should
be adjusted in proportion to the level of ambient lighting;
the LX1970 can provide closed loop brightness control for
this type of system. For most indoor applications, the 1200
lux saturation point of the LX1970 is usually not a limiting
affect.
LX1970 Calculated SRC Full Range Response
1000
900
800
700
600
500
400
300
200
100
0
0
200 400 600 800 1000 1200
Light (lux)
The LX1971 is best suited for applications where the
system must respond to external events that affect the
user’s ability to see clearly. For example, a sensor to turn
on headlights or a sensor to adjust the reflectivity of a rear
view mirrors. These systems require the sensor to have
dynamic range similar to sight. Like the human eye, the
square root function of the LX1971 makes it extra sensitive
to small changes at lower light levels. The wide dynamic
range allows the LX1971 to sense the difference between
twilight and daylight or sunshine and heavy cloud cover.
LX1970 SRC Actual SRC with 10K Resistor
450
400
350
300
250
200
150
100
The first curve shows the calculated responsiveness of
the LX1970 without load resistors based on the formula
above. It can be used as baseline guidelines to calculate
gain setting resistors. The compliance of the current source
output may result in premature saturation of the output
when load resistors are added. The SRC compliance
voltage is specified typically at VDD-350mV @ about 100
lux. The second curve shows saturation of the output with
VIN = 5V and a 10K resistor SRC to ground, above about
300uA the output becomes non-linear as it begins to
saturate.
50
0
0
200 400 600 800 1000 1200
Light (lux)
Copyright © 2002
Rev. 1.4b, 2005-08-10
DataSheet4 U .com
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LX1970.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LX1970 | Visible Light Sensor | Microsemi Corporation |
| LX1971 | Wide Range Visible Light Sensor | Microsemi Corporation |
| LX1972 | Ambient Light Detector | Microsemi Corporation |
| LX1972A | Ambient Light Detector | Microsemi Corporation |
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