TSL245
INFRARED LIGHT-TO-FREQUENCY CONVERTER
SOES018 鈥?MAY 1995
D
D
D
High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
Direct Interface With a Microcontroller
Compact Three-Leaded Plastic Package
D
D
D
D
Single-Supply Operation Down to 2.7 V
Nonlinearity Error Typically 0.2% at 100 kHz
Advanced LinCMOS鈩?Technology
Integral Visible-Light Cutoff Filter
description
The TSL245 infrared light-to-frequency converter combines a silicon photodiode and a current-to-frequency
converter on a single monolithic CMOS integrated circuit. The output is a square wave (50% duty cycle) with
frequency directly proportional to light intensity. Because the output is TTL compatible, it allows direct interface
to a microcontroller or other logic circuitry. The device responds over the infrared light range of 800 nm to
1100 nm. The TSL245 is characterized for operation over the temperature range of 鈥?25擄C to 70擄C.
The TSL245 is offered in a black, infrared-transmissive package (see Figure 1). The photodiode area is
1.36 mm
2
(0.0029 in
2
).
2,0 (0.079) T.P.鈥?/div>
0,75 (0.030)
0,65 (0.026)
2,25 (0.089)
1,75 (0.069)
1,25 (0.049)
0,75 (0.030)
0,635 (0.025)
0,4 (0.016)
1
2
4,0 (0.157) T.P.鈥?/div>
3
Pin 1
Pin 2
Pin 3
GND
VDD
OUT
1
2
2,05 (0.081)
1,55 (0.061)
3
0,86 (0.034)
0,46 (0.018)
0,65 (0.026)
0,55 (0.022)
15,7 (0.619)
13,2 (0.520)
4,8 (0.189)
4,4 (0.173)
0,85 (0.033)
0,35 (0.014)
0,51 (0.02)
0,385 (0.015)
0,75 (0.030) R
3,05 (0.120)
2,55 (0.100)
4,85 (0.191)
4,35 (0.171)
1,75 (0.069)
1,25 (0.049)
4,35 (0.171)
3,85 (0.152)
5,05 (0.199)
4,55 (0.179)
鈥?True position when unit is installed.
NOTE A: All linear dimensions are in millimeters and parenthetically in inches.
2,74 (0.108)
2,34 (0.092)
Figure 1. TSL245 Packaging Configuration
Advanced LinCMOS is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
漏
1995, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1
1
2
3
4
5
6
