TAOS Inc.
is now
ams AG
The technical content of this TAOS datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail:
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Please visit our website at
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r
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TSL235R
LIGHT-TO-FREQUENCY CONVERTER
TAOS038E
−SEPTEMBER
2007
D
High-Resolution Conversion of Light
D
D
D
D
D
D
D
Description
The TSL235R light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter
on a single monolithic CMOS integrated circuit. Output is a square wave (50% duty cycle) with frequency directly
proportional to light intensity (irradiance) on the photodiode. The digital output allows direct interface to a
microcontroller or other logic circuitry. The device has been temperature compensated for the
ultraviolet-to-visible light range of 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm.
The TSL235R is characterized for operation over the temperature range of
−25°C
to 70°C and is supplied in
a 3-lead clear plastic side-looker package with an integral lens. When supplied in the lead (Pb) free package,
the device is RoHS compliant.
Functional Block Diagram
Light
Available Options
DEVICE
T
A
TSL235R
TSL235R
TSL235R
−25°C
to 70°C
−25°C
to 70°C
−25°C
to 70°C
ch
ni
c
Terminal Functions
TERMINAL
Te
NAME
NO.
1
3
2
TYPE
GND
OUT
V
DD
O
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1
GND
2
V
DD
3
OUT
Photodiode
Current-to-Frequency
Converter
Output
PACKAGE
−
LEADS
PACKAGE DESIGNATOR
S
S
SM
3-lead Sidelooker
3-lead Sidelooker—Lead (Pb) Free
3-lead Surface-Mount Sidelooker—Lead (Pb) Free
TSL235R
DESCRIPTION
Power supply ground (substrate). All voltages are referenced to GND.
Output frequency.
Supply voltage.
1
GND
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
r
www.taosinc.com
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V
DD
3
OUT
ORDERING NUMBER
TSL235R−LF
TSL235RSM−LF
Copyright
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2007, TAOS Inc.
Intensity to Frequency With No External
Components
Communicates Directly With a
Microcontroller
Compact Three-Leaded Clear-Plastic
Package
Single-Supply Operation Down to 2.7 V
Nonlinearity Error Typically 0.2% at 100 kHz
Stable 150 ppm/°C Temperature Coefficient
Single-Supply Operation
RoHS Compliant (−LF Package Only)
PACKAGE S
SIDELOOKER
(FRONT VIEW)
PACKAGE SM
SURFACE MOUNT
SIDELOOKER
(FRONT VIEW)
TSL235R
LIGHT-TO-FREQUENCY CONVERTER
TAOS038E
−SEPTEMBER
2007
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Operating free-air temperature range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−25°C
to 70°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−25°C
to 85°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds (S Package) . . . . . . . . . . . . . . . . . . . . 260°C
Reflow solder, in accordance with J-STD-020C or J-STD-020D (SM Package) . . . . . . . . . . . . . . . . . . . 260°C
†
Recommended Operating Conditions
MIN
Supply voltage, V
DD
2.7
Operating free-air temperature range, T
A
−25
NOM
Electrical Characteristics at V
DD
= 5 V, T
A
= 25°C (unless otherwise noted)
PARAMETER
V
OH
V
OL
I
DD
High-level output voltage
Low-level output voltage
Supply current
Full-scale frequency
‡
k
SVS
‡
Temperature coefficient of output frequency
Supply-voltage sensitivity
Full-scale frequency is the maximum operating frequency of the device without saturation.
Operating Characteristics at V
DD
= 5 V, T
A
= 25°C
PARAMETER
f
O
Output frequency
Nonlinearity
§
N li
it
Step response to full-scale step input
‡
§
Te
ch
ni
c
Full-scale frequency is the maximum operating frequency of the device without saturation.
Nonlinearity is defined as the deviation of f
O
from a straight line between zero and full scale, expressed as a percent of full scale.
Copyright
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2007, TAOS Inc.
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TEST CONDITIONS
MIN
TYP
MAX
I
OH
=
−
4 mA
I
OL
= 4 mA
4
4.5
V
V
0.25
0.4
2
3
500
Wavelength < 700nm
V
DD
= 5 V
±10%
±
150
±
0.5
TEST CONDITIONS
MIN
TYP
MAX
E
e
= 430
μW/cm
2
,
λ
p
= 635 nm
f
O
= 0 kHz to 10 kHz
200
250
0.4
300
10
E
e
= 0
μW/cm
2
±
0.1%
±
0.2%
f
O
= 0 kHz to 100 kHz
1 pulse of new
frequency plus 1
μs
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MAX
UNIT
V
°C
5.5
UNIT
mA
kHz
ppm/°C
%/ V
UNIT
kHz
Hz
%F.S.
%F.S.
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.
NOTE 1: All voltage values are with respect to GND.
TSL235R
LIGHT-TO-FREQUENCY CONVERTER
TAOS038E
−SEPTEMBER
2007
TYPICAL CHARACTERISTICS
OUTPUT FREQUENCY
vs
IRRADIANCE
1000
V
DD
= 5 V
λ
p
= 635 nm
T
A
= 25°C
Normalized Responsivity
1.2
PHOTODIODE SPECTRAL RESPONSIVITY
f
O
— Output Frequency — kHz
100
1.0
10
0.8
1
0.6
0.1
0.01
0.001
0.001
0.01
0.1
E
e
−
Irradiance
−
μW/cm
2
1.2
Temperature Coefficient of Output Frequency — ppm/5C
DARK FREQUENCY
vs
TEMPERATURE
V
DD
= 5 V
E
e
= 0
1
f
O(dark)
— Dark Frequency — Hz
0.8
0.6
ch
ni
c
0.4
0.2
0
−25
Te
0
25
50
T
A
−
Temperature
−
°C
am
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lv
0.4
0.2
1
10
10 0
1k
0
300
400
500
600 700 800 900
λ
−
Wavelength
−
nm
Figure 1
Figure 2
TEMPERATURE COEFFICIENT
OF OUTPUT FREQUENCY
vs
WAVELENGTH OF INCIDENT LIGHT
7000
6000
5000
4000
3000
2000
1000
V
DD
= 5 V
75
0
300
400
500
600
700
λ
−
Wavelength of Incident Light
−
nm
Figure 3
Figure 4
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1000 1100
800
900
1000
Copyright
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2007, TAOS Inc.
3
TSL235R
LIGHT-TO-FREQUENCY CONVERTER
TAOS038E
−SEPTEMBER
2007
TYPICAL CHARACTERISTICS
OUTPUT FREQUENCY
vs
SUPPLY VOLTAGE
1.010
T
A
= 25°C
f
O
= 250 kHz
1.005
Normalized Output Frequency
1.000
0.995
Te
ch
ni
c
Copyright
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2007, TAOS Inc.
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0.990
0.985
0.980
2.5
3
3.5
4
4.5
5
5.5
V
DD
−
Supply Voltage
−
V
Figure 5
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