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TSL245R
INFRARED LIGHT-TO-FREQUENCY CONVERTER
TAOS060D
−
SEPTEMBER 2007
D
High-Resolution Conversion of Light
D
D
D
D
D
D
D
D
D
Intensity to Frequency With No External
Components
Communicates Directly With a
Microcontroller
Compact Three-Leaded Plastic Package
Integral Visible-Light Cutoff Filter
Single-Supply Operation . . . 2.7 V to 5.5 V
High Irradiance Responsivity . . . Typically
500 Hz/(μW/cm
2
) at 940 nm
Nonlinearity Error Typically 0.2% at 100 kHz
Available in Through-Hole and Surface
Mount Three-Lead Sidelooker Packages
Replacement for TSL245
Lead (Pb) Free Package Option Available
PACKAGE S
SIDELOOKER
(FRONT VIEW)
PACKAGE SM
SURFACE MOUNT
SIDELOOKER
(FRONT VIEW)
1
GND
2
V
DD
3
OUT
1
GND
2
V
DD
3
OUT
Description
The TSL245R 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 TSL245R is characterized for operation over the temperature range
of
−25°C
to 70°C and is supplied in a 3-lead plastic side-looker package with an integral visible-light cutoff filter
and lens. When supplied in the lead (Pb) free package, the devices are RoHS compliant.
Functional Block Diagram
Current-to-Frequency
Converter
Light
Photodiode
Output
Available Options
DEVICE
TSL245R
TSL245R
TSL245R
TSL245R
T
A
−25°C
to 70°
−25°C
to 70°
−25°C
to 70°
−25°C
to 70°
PACKAGE
−
LEADS
3-lead Sidelooker
3-lead Sidelooker — Lead (Pb) Free
3-lead Surface Mount Sidelooker
3-lead Surface Mount Side-Looker — Lead (Pb)
Free
PACKAGE DESIGNATOR
S
S
SM
SM
ORDERING NUMBER
TSL245R
TSL245R−LF
TSL245RSM
TSL245RSM−LF
The
LUMENOLOGY
r
Company
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
r
www.taosinc.com
1
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Copyright
E
2007, TAOS Inc.
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
