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LX1970IDU

P1-P3P4-P6P7-P9P10-P10
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2007
Rev. 1.5b, 2008-01-25
WWW.Microsemi .COM
LX1970
V
isible Li
g
ht Sensor
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
DESCRIPTION
The LX1970 is a new technology light
sensor with spectral response that
emulates the human eye.
This device is ideal for monitoring
ambient light for brightness control
systems in flat panel displays. It has a
unique photo diode arrangement (patents
pending) with a peak response at 520 nm
while sharply attenuating both ultra violet
and infrared wavelengths.
The photo sensor is a PIN diode array
with an accurate, linear, and very
repeatable current transfer function.
Photo current is multiplied by
integrated high gain amplifiers and is
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 10KΩ to 50KΩ range.
With accurate internal gain amplifiers,
design complexity and cost are greatly
reduced.
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
PRODUCT HIGHLIGHT
I
SNK
I
SRC
Ambient
Light
V
OUT
V
DD
GND
0.3V Typ
0.3V TYP
50K
4.7uF
LX1970
V
DD
50K
4.7uF
SNK
SRC
PACKAGE ORDER INFO
DU
Plastic MSOP
8-Pin
T
A
(°C)
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)
L
L
X
X
1
1
9
9
7
7
0
0
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2007
Rev. 1.5b, 2008-01-25
WWW.Microsemi .COM
LX1970
V
isible Li
g
ht Sensor
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
ABSOLUTE MAXIMUM RATINGS
V
DD
................................................................................................................. -0.3 to 6 V
DC
SNK/SRC (Output Compliance Voltage)........................................... -0.3 to V
DD
+ 0.3V
DC
SNK/SRC (Maximum Output Current)................................................... Internally Limited
Operating Temperature Range ........................................................................ -40 to +85°C
Storage Temperature Range.......................................................................... -40 to +100°C
Solder Reflow Peak Temperature (40 seconds maximum exposure) ............260°C (+0, -5)
Notes: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
DU
Plastic MSOP 8-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ
JA
206°C/W
THERMAL RESISTANCE-JUNCTION TO CASE, θ
JC
39°C/W
PACKAGE PIN OUT
VSS
NC
NC
SNK
VDD
NC
NC
SRC
1
2
3
54
6
7
8
DU PACKAGE
(Top View)
1
2
3
45
6
7
8
1970
xxxx
DU PACKAGE
(Bottom View)
xxxx = Denotes Date Code / Lot Information
RoHS / Pb-free NiPdAu Pin Finish
MSL 2 / 260°C / 1 Year
FUNCTIONAL PIN DESCRIPTION
NAME DESCRIPTION
V
DD
Input Supply Voltage
V
SS
Ground Reference for Power and Signal Output
SNK Output Current Sink
SRC Output Current Source
SIMPLIFIED BLOCK DIAGRAM
PACKAGE PHOTO
V
DD
V
SS
SNK
SRC
P
P
A
A
C
C
K
K
A
A
G
G
E
E
D
D
A
A
T
T
A
A
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2007
Rev. 1.5b, 2008-01-25
WWW.Microsemi .COM
LX1970
V
isible Li
g
ht Sensor
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
RECOMMENDED OPERATING CONDITIONS
LX1970
Parameter
Min Typ Max
Units
Supply Voltage (V
DD
) 2¹ 5.5 V
SNK Compliance Voltage Range V
SS
+0.5 V
DD
V
SRC Compliance Voltage Range V
SS
V
DD
- 0.5 V
SNK/SRC Output Resistor Range 10 1000 KΩ
Note 1: SRC output will work down to V
DD
=1.8V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C ≤ T
A
≤ 85°C, V
DD
= 2V to
5.5V, R
LOAD
= 50Kohms, Direct Light Input² of 14.6µW/cm
2
except where otherwise noted. Performance between -40°C and 0°C and
between 70°C and 85°C are assured by design and characterization.
LX1970
Parameter Symbol Test Conditions
Min Typ Max
Units
Supply Voltage Range V
DD
2 5.5 V
DC
Input Supply Current I
DD
V
DD
= 3.0V, I
SRC
= 38µA, I
SNK
= open 60 85 110 µA
I
SRC
V
DD
= 3.0V 30 38 46 µA
Output Current
3
I
SNK
V
DD
= 3.0V -30 -38 -46 µA
Output SNK/SRC Current Matching I
MATCH
V
DD
= 3.0V 0.5 2 %
SNK Minimum Compliance Voltage SNK
VMIN
V
DD
= 3.0V, @ 95% of nominal output
current
V
SS
+0.3 V
SS
+0.5 V
SRC Maximum Compliance Voltage SRC
VMAX
V
DD
= 3.0V, @ 95% of nominal output
current
V
DD
– 0.3 V
DD
– 0.5 V
SNK/SRC Output Dark Current I
DARK
V
DD
= 5.5V, No Light 10 300 nA
Wavelength of Peak Sensitivity λ
PS
520 nm
Half Reception Angle θ
½
±60 deg
Supply Voltage Coefficient of Output
Current
PSRR V
DD
= 2V to 5.5V 2.2 5 %/V
Sensitivity @ 540nm (peak) Irradiance current responsivity 2.6 A/(W/cm
2
)
Sensitivity Change @ 910nm
4
Current responsivity change with
additional direct light input of 14.6µW/cm
2
at 910nm
-5 0 5 % of peak
Radiant Sensitive Area Photodiode area 0.369 mm
2
Note 2: The input irradiance is supplied from a white light-emitting diode (LED) optical source adjusted to impose 14.6µW/cm
2
at 555nm on the sensor’s
surface.
Note 3: See Figure 1
Note 4: See Figure 2
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
P1-P3P4-P6P7-P9P10-P10

LX1970IDU

Mfr. #:
Buy LX1970IDU
Manufacturer:
Microchip / Microsemi
Description:
Optical Sensors Ambient Light Sensors
Lifecycle:
New from this manufacturer.
Delivery:
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