TSL238 Datasheet, PDF (1/12 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER

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D High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
D High Irradiance Responsivity . . .
2.3 kHz/(mW/cm²) at λ_p = 524 nm
D Low Dark Frequency . . . < 2 Hz at 255 C
D Single-Supply Operation . . . 2.7 V to 5.5 V
D Stable 200 ppm/°C Temperature Coefficient
D Interfaces Directly to a Microcontroller
D Lead (Pb) Free Package
D RoHS Compliant
TSL238
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS073F − OCTOBER 2007
PACKAGE D
8-LEAD SOIC
(TOP VIEW)
NC 1
8 OUT
NC 2
NC 3
NC 4
7 V_DD
6 GND
5 OE
Description
The TSL238 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 TSL238 is characterized for operation over the temperature range of −25°C to 70°C and is supplied in an
8-lead plastic small outline package. When supplied in the lead (Pb) free package, the device is RoHS
compliant.
For automotive and other extended temperature applications, please contact TAOS for information.
Functional Block Diagram
Light
Photodiode
Current-to-Frequency
Converter
Output
Available Options
DEVICE
TSL238
T_A
−25°C to 70°C
PACKAGE − LEADS
8-lead Plastic Small Outline IC
PACKAGE DESIGNATOR ORDERING NUMBER
D
TSL238D
The LUMENOLOGY r Company
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Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972_r) 673-0759
www.taosinc.com
Copyright E 2007, TAOS Inc.
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