TSL250RD, TSL251RD, TSL260RD, TSL261RD
LIGHT-TO-VOLTAGE OPTICAL SENSORS
TAOS050 - SEPTEMBER 2003
1
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2003, TAOS Inc.
www.taosinc.com
D
Monolithic Silicon IC Containing
Photodiode, Operational Amplifier, and
Feedback Components
D
Converts Light Intensity to a Voltage
D
High Irradiance Responsivity, Typically
- 69 mV/(
m
W/cm
2
) at
l
p
= 640 nm
(TSL250RD)
- 62 mV/(
m
W/cm
2
) at
l
p
= 940 nm
(TSL260RD)
D
Single Voltage Supply Operation
D
Low Dark (Offset) Voltage . . . 10 mV Max
D
Low Supply Current . . . 1.1 mA Typical
D
Wide Supply-Voltage Range . . . 2.7 V to 5.5 V
D
Low-Profile Surface-Mount Package:
- Clear Plastic for TSL250RD and
TSL251RD
- Visible Light-Cutoff Filter Plastic for
TSL260RD and TSL261RD
Description
The TSL250RD, TSL251RD, TSL260RD, and TSL261RD are light-to-voltage optical sensors, each combining
a photodiode and a transimpedance amplifier on a single monolithic IC. The TSL250RD and TSL260RD have
an equivalent feedback resistance of 16 M
and a photodiode measuring 1 square mm. The TSL251RD and
TSL261RD have an equivalent feedback resistance of 8 M
and a photodiode measuring 0.5 square mm.
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.
Functional Block Diagram
Voltage
Output
+
-
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
DESCRIPTION
GND
4
Ground (substrate). All voltages are referenced to GND.
OUT
7
Output voltage.
V
DD
6
Supply voltage.
r
r
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S
Plano, TX 75074
S
(972) 673-0759
8 NC
7 OUT
6 V
DD
5 NC
PACKAGE D
8-LEAD SOIC
(TOP VIEW)
NC
1
NC 2
NC 3
GND 4
TSL250RD, TSL251RD, TSL260RD, TSL261RD
LIGHT-TO-VOLTAGE OPTICAL SENSORS
TAOS050 - SEPTEMBER 2003
2
r
r
Copyright
E
2003, TAOS Inc.
The
LUMENOLOGY
r
Company
www.taosinc.com
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solder conditions in accordance with JEDEC J-STD-020A, maximum temperature
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, R
L
= 10 k
(unless otherwise noted) (see Notes
3, 4, 5, and 6)
p = 640 nm
p = 940 nm
PARAMETER
TEST
CONDITIONS
TSL250RD
TSL251RD
TSL260RD
TSL261RD
UNIT
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
V
D
Dark
voltage
E
e
= 0
0
5
10
0
5
10
0
5
10
0
5
10
mV
V
OM
Maximum
output
voltage
V
DD
= 4.5 V
3
3.3
3
3.3
3
3.3
3
3.3
V
E
e
= 29
W/cm
2
1.5
2
2.5
V
O
Output
E
e
= 116
W/cm
2
1.5
2
2.5
V
V
O
Out ut
voltage
E
e
= 32
W/cm
2
1
2
3
V
E
e
= 124
W/cm
2
1
2
3
R
e
Irradiance
responsivity
See Note 7
69
17
62
16
mV/
(
W/
cm
2
)
Temperature
coefficient of
V
O
= 2 V @ 25
C,
T
0
C to 70
C
2
2
8
8
mV/
C
coefficient of
output voltage (V
O
)
T
A
= 0
C to 70
C
(see Note 8)
0.1
0.1
0.4
0.4
%/
C
E
e
= 29
W/cm
2
1.1
1.7
I
Supply
E
e
= 116
W/cm
2
1.1
1.7
mA
I
DD
Su
ly
current
E
e
= 32
W/cm
2
1.1
1.7
mA
E
e
= 124
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 640 nm input irradiance E
e
is supplied by an Al
I
nGaP LED with peak wavelength
p
= 640 nm.
6. The 940 nm input irradiance E
e
is supplied by a GaAs LED with peak wavelength
p
= 940 nm.
7. Irradiance responsivity is characterized over the range V
O
= V
D
to 3 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.
8. The temperature coefficient of output voltage measurement is made by adjusting irradiance such that V
O
is approximately 2 V at
25
C and then with irradiance held constant, measuring V
O
while varying the temperature between 0
C and 70
C.
TSL250RD, TSL251RD, TSL260RD, TSL261RD
LIGHT-TO-VOLTAGE OPTICAL SENSORS
TAOS050 - SEPTEMBER 2003
3
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2003, TAOS Inc.
www.taosinc.com
Dynamic Characteristics at V
DD
= 5 V, T
A
= 25
C, R
L
= 10 k
(unless otherwise noted) (see Figure 1)
p = 640 nm
p = 940 nm
PARAMETER
TEST
CONDITIONS
TSL250RD
TSL251RD
TSL260RD
TSL261RD
UNIT
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
t
r
Output
pulse rise
time
V
O(peak)
= 2 V
260
70
260
70
s
t
f
Output
pulse fall
time
V
O(peak)
= 2 V
260
70
260
70
s
V
n
Output
noise
voltage
E
e
= 0,
f = 1000 Hz
0.8
0.7
0.8
0.7
V/
(
(Hz))
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
TEST CIRCUIT
Input
E
e
10%
90%
Output
(see Note B)
t
r
TSL2xxRD
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 light-emitting diode with 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
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