TSL250R, TSL251R, TSL252R
LIGHT TO VOLTAGE OPTICAL SENSORS
TAOS028 APRIL 2001
1
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t
t
Copyright
E
2001, TAOS Inc.
D
Monolithic Silicon IC Containing
Photodiode, Operational Amplifier, and
Feedback Components
D
Converts Light Intensity to a Voltage
D
High Irradiance Responsivity, Typically 137
mV/(
m
W/cm
2
) at
l
p
= 635 nm (TSL250R)
D
Compact 3-Lead Clear Plastic Package
D
Single Voltage Supply Operation
D
Low Dark (Offset) Voltage....10mV Max
D
Low Supply Current......1.1 mA Typical
D
Wide Supply-Voltage Range.... 2.7 V to 5.5 V
D
Replacements for TSL250, TSL251, and
TSL25
2
Description
The TSL250R, TSL251R, and TSL252R are light-to-voltage optical sensors, each combining a photodiode and
a transimpedance amplifier (feedback resistor = 16 M
, 8 M
, and 2.8 M
respectively) on a single monolithic
IC. Output voltage is directly proportional to the light intensity (irradiance) on the photodiode. These devices
have improved amplifier offset-voltage stability and low power consumption and are supplied in a 3-lead clear
plastic sidelooker package with an integral lens
Functional Block Diagram
Voltage
Output
+
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
DESCRIPTION
GND
1
Ground (substrate). All voltages are referenced to GND.
OUT
3
Output voltage
V
DD
2
Supply voltage
t
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S
Plano, TX 75074
S
(972) 673-0759
3
2
1
OUT
V
DD
GND
PACKAGE
(FRONT VIEW)
TSL250R, TSL251R, TSL252R
LIGHT TO VOLTAGE OPTICAL SENSORS
TAOS028 APRIL 2001
2
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t
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Copyright
E
2001, TAOS Inc.
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
DD
(see Note 1)
6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, I
O
10 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duration of short-circuit current at (or below) 25
C (see Note 2)
5 s
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
25
C to 85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
25
C to 85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
240
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. All voltages are with respect to GND.
2. Output may be shorted to supply.
Recommended Operating Conditions
MIN
NOM
MAX
UNIT
Supply voltage, V
DD
2.7
5.5
V
Operating free-air temperature, T
A
0
70
C
Electrical Characteristics at V
DD
= 5 V, T
A
= 25
C,
p = 635 nm, R
L
= 10 k
(unless otherwise noted)
(see Notes 3, 4, and 5)
PARAMETER
TEST
TSL250R
TSL251R
TSL252R
UNIT
PARAMETER
TEST
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
V
D
Dark voltage
E
e
= 0
0
4
10
0
4
10
0
4
10
mV
V
OM
Maximum output
voltage
V
DD
= 4.5 V
3.0
3.3
3.0
3.3
3.0
3.3
V
E
e
= 14.6
W/cm
2
1.5
2
2.5
V
O
Output voltage
E
e
= 38.5
W/cm
2
1.5
2
2.5
V
V
O
Out ut voltage
E
e
= 196
W/cm
2
1.5
2
2.5
V
E
e
= 14.6
W/cm
2
,
1.6
mV/
C
Temperature
E
e
= 14.6
W/cm ,
T
A
= 0
C to 70
C
0.08
%/
C
Temperature
coefficient of
E
e
= 38.5
W/cm
2
,
1.6
mV/
C
vo
coefficient of
output voltage
(V )
E
e
= 38.5
W/cm ,
T
A
= 0
C to 70
C
0.08
%/
C
g
(V
O
)
E
e
= 196
W/cm
2
,
1.6
mV/
C
E
e
= 196
W/cm ,
T
A
= 0
C to 70
C
0.08
%/
C
N
Irradiance
p
= 635 nm,
See Notes 5 and 7
137
52
10.2
mV/( W/cm
2
)
N
e
Irradiance
responsivity
p
= 880 nm,
See Notes 6 and 7
127
48
9.4
mV/(
W/cm
2
)
E
e
= 14.6
W/cm
2
1.1
1.7
I
DD
Supply current
E
e
= 38.5
W/cm
2
1.1
1.7
mA
DD
y
E
e
= 196
W/cm
2
1.1
1.7
NOTES:
3. Measurements are made with R
L
= 10 k
between output and ground.
4. Optical measurements are made using small-angle incident radiation from an LED optical source.
5. The input irradiance E
e
is supplied by an Al
I
nGaP LED with peak wavelength
p
= 635 nm
6. The input irradiance E
e
is supplied by a Ga
Al
As LED with peak wavelength
p
= 880 nm
7. Irradiance responsivity is characterized over the range V
O
= 0.05 to 2.9 V. The best-fit straight line of Output Voltage V
O
versus
irradiance E
e
over this range will typically have a positive extrapolated V
O
value for E
e
= 0.
TSL250R, TSL251R, TSL252R
LIGHT TO VOLTAGE OPTICAL SENSORS
TAOS028 APRIL 2001
3
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2001, TAOS Inc.
Dynamic Characteristics at T
A
= 25
C (see Figure 1)
PARAMETER
TEST CONDITIONS
TSL250R
TSL251R
TSL252R
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
t
r
Output pulse rise time
V
DD
= 5 V,
p
= 635 nm
260
70
7
s
t
f
Output pulse fall time
V
DD
= 5 V,
p
= 635 nm
260
70
7
s
V
n
Output noise voltage
V
DD
= 5 V,
f = 1000 Hz
E
e
= 0,
0.8
0.7
0.6
V/
Hz
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
TEST CIRCUIT
Input
E
e
10%
90%
Output
(see Note B)
t
r
TSL25xR
R
L
V
DD
2
1
3
+
Output
Pulse
Generator
LED
(see Note A)
t
f
90%
10%
NOTES: A. The input irradiance is supplied by a pulsed Al
I
nGaP light-emitting diode with the following characteristics:
p
= 635 nm,
t
r
< 1
s, t
f
< 1
s.
B. The output waveform is monitored on an oscilloscope with the following characteristics: t
r
< 100 ns, Z
i
1 M
, C
i
20 pF.
Figure 1. Switching Times
TSL250R, TSL251R, TSL252R
LIGHT TO VOLTAGE OPTICAL SENSORS
TAOS028 APRIL 2001
4
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t
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2001, TAOS Inc.
TYPICAL CHARACTERISTICS
0.01
0.1
1
10
100
Output V
oltage V
OUTPUT VOLTAGE
vs
IRRADIANCE
0.1
1
10
O
V
E
e
Irradiance
W/cm
2
V
DD
= 5 V
p
= 635 nm
R
L
= 10 k
W
T
A
= 25
C
Figure 2
TSL250R
TSL251R
TSL252R
0.4
0
300
500
700
900
Relative Responsivity
PHOTODIODE SPECTRAL RESPONSIVITY
1
1100
0.8
0.6
0.2
Wavelength nm
T
A
= 25
C
Normalized to
635 nm
Figure 3
Figure 4
4
2
1
0
5.5
2.5
3
3.5
5
MAXIMUM OUTPUT VOLTAGE
vs
SUPPLY VOLTAGE
4
4.5
5
Maximum Output V
oltage V
V
OM
3
V
DD
Supply Voltage V
R
L
= 10 k
T
A
= 25
C
Figure 5
1
0.6
0
1
2
3
1.6
4
1.4
1.2
0.8
V
O
Output Voltage V
Supply Current mA
I DD
SUPPLY CURRENT
vs
OUTPUT VOLTAGE
V
DD
= 5 V
R
L
= 10 k
W
T
A
= 25
C
TSL250R, TSL251R, TSL252R
LIGHT TO VOLTAGE OPTICAL SENSORS
TAOS028 APRIL 2001
5
www.taosinc.com
t
t
Copyright
E
2001, TAOS Inc.
TYPICAL CHARACTERISTICS
0.4
0
Normalized Output V
oltage
1
0.8
0.6
0.2
Angular Displacement
TSL250R
80
60
40
20
0
80
60
40
20
Optical Axis
NORMALIZED OUTPUT VOLTAGE
vs
ANGULAR DISPLACEMENT
V
O
Figure 6
TSL252R
TSL251R
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