TSL256 HIGHSENSITIVITY LIGHTTOVOLTAGE CONVERTER TAOS014 – JANUARY 2000 PACKAGE (FRONT VIEW) High Sensitivity Low Noise (500 µVrms Typ) Rail-to-Rail Output High Power-Supply Rejection (>35 dB) Single Voltage Supply Operation Monolithic Silicon IC Containing Photodiode, Operational Amplifier, and Feedback Components Converts Light Intensity to Output Voltage Compact 3-Leaded Plastic Package Wide Supply-Voltage Range 1 2 3 GND VDD OUT Description The TSL256 is a high-sensitivity low-noise light-to-voltage optical converter that combines a photodiode and a transimpedance amplifier on a single monolithic CMOS integrated circuit. The output voltage is directly proportional to light intensity (irradiance) on the photodiode. The TSL256 has a transimpedance gain of 320 MΩ. The device has improved offset voltage stability and low power consumption and is supplied in a 3-lead clear plastic sidelooker package with an integral lens. Functional Block Diagram – Voltage Output + Terminal Functions TERMINAL NAME DESCRIPTION NO. GND 1 Ground (substrate). All voltages are referenced to GND. OUT 3 Output voltage VDD 2 Supply voltage www.taosinc.com Copyright 2000, TAOS Inc. Texas Advanced Optoelectronic Solutions Inc. 800 Jupiter Road, Suite 205 Plano, TX 75074 (972) 673-0759 Powered by ICminer.com Electronic-Library Service CopyRight 2003 1 TSL256 HIGHSENSITIVITY LIGHTTOVOLTAGE CONVERTER TAOS014 – JANUARY 2000 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10 mA Duration of short-circuit current at (or below) 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 s Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to 85°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to 85°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. NOTE 1: All voltages are with respect to GND. Recommended Operating Conditions Supply voltage, VDD Operating free-air temperature, TA MIN MAX 4.5 5.5 UNIT V 0 70 °C Electrical Characteristics at VDD = 5 V, TA = 25°C, λp = 470 nm, RL = 10 kΩ (unless otherwise noted) (see Notes 2 and 3) PARAMETER VD TEST CONDITIONS Dark voltage MIN TYP Ee = 0 MAX 15 VDD = 4.5 V, No Load VDD = 4.5 V, RL = 10 kΩ UNIT mV 4.49 VOM Maximum output voltage swing VO Output voltage Ee = 1.7µW/cm2 αVD Temperature coefficient of dark voltage (VD) Irradiance responsivity TA = 0°C to 70°C –15 µV/°C See Note 2 1.17 V/(µW/cm2) Power supply y rejection j fac = 100 Hz 55 dB fac = 1 kHz 35 dB Ne IDD 4 1.6 Supply current V 4.2 2 2.5 2.4 4.5 V mA NOTE 2: Irradiance responsivity is characterized over the range VO = 0.1 V to 4.5 V. Switching Characteristics at VDD = 5 V, TA = 25°C, λp = 470 nm, RL = 10 kΩ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT tr Output pulse rise time, 10% to 90% of final value See Notes 3, 4, and 5 160 250 µs tf Output pulse fall time, 10% to 90% of final value See Notes 3, 4, and 5 150 250 µs ts Output settling time to 1% of final value Integrated noise voltage Vn Output noise voltage, g , rms 330 µs f = dc to 1 kHz 500 µVrms f = 10 Hz 4.7 f = 100 Hz 5.4 f = 1kHz 7.2 µV/√Hz µ √ rms NOTES: 3. Measured with RL = 10 kΩ between output and ground. 4. The output waveform is monitored on an oscilloscope with Zi = 1 MΩ, Ci < 20 pF. 5. Switching characteristics apply over the range VO = 0.1 V to 4.5 V. www.taosinc.com 2 Powered by ICminer.com Electronic-Library Service CopyRight 2003 TSL256 HIGHSENSITIVITY LIGHTTOVOLTAGE CONVERTER TAOS014 – JANUARY 2000 PARAMETER MEASUREMENT INFORMATION VDD Pulse Generator Ee 2 Input – LED (see Note A) 3 tf tr Output + 90% RL TSL256 1 Output (see Note B) 90% 10% 10% VOLTAGE WAVEFORM TEST CIRCUIT NOTES: A. The input irradiance is supplied by a pulsed InGaN light-emitting diode with the following characteristics: λp = 470 nm, tr < 1 µs, tf < 1 µs. B. The output waveform is monitored on an oscilloscope with the following characteristics: tr < 100 ns, Zi ≥ 1 MΩ, Ci ≤ 20 pF. Figure 1. Switching Times TYPICAL CHARACTERISTICS POWER SUPPLY REJECTION vs FREQUENCY PHOTODIODE SPECTRAL RESPONSIVITY 1 80 TA = 25°C 70 0.8 Power Supply Rejection – dB Relative Responsivity 60 0.6 0.4 0.2 50 40 30 20 10 0 300 0 500 700 900 λ – Wavelength – nm 1100 10 102 Figure 2 www.taosinc.com 105 106 Figure 3 Powered by ICminer.com Electronic-Library Service CopyRight 2003 103 104 f – Frequency – Hz 3 TSL256 HIGHSENSITIVITY LIGHTTOVOLTAGE CONVERTER TAOS014 – JANUARY 2000 TYPICAL CHARACTERISTICS INTEGRATED NOISE VOLTAGE vs MEASUREMENT BANDWIDTH FREQUENCY DARK VOLTAGE vs FREE-AIR TEMPERATURE 700 Vn – Integrated Noise Voltage – µ V 10 VDD = 5 V 9 V D – Dark Voltage – V 8 7 6 5 4 3 2 VDD = 5 V TA = 25°C 600 500 400 300 200 100 1 0 0 0 10 30 50 20 40 60 TA – Free-Air Temperature – °C 70 10 102 103 104 f – Measurement Bandwidth Frequency – Hz Figure 4 Figure 5 NORMALIZED RESPONSE VS ANGULAR DISPLACEMENT 1.0 0.9 Normalized Response 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –80 0 –40 –20 20 40 –60 Angular Displacement – Degrees 60 80 Figure 6 www.taosinc.com 4 Powered by ICminer.com Electronic-Library Service CopyRight 2003 TSL256 HIGHSENSITIVITY LIGHTTOVOLTAGE CONVERTER TAOS014 – JANUARY 2000 MECHANICAL DATA The TSL256 is supplied in a clear 3-leaded package with a large molded focusing lens. 0.072 (1,84) 0.057 (1,44) 0.189 (4,80) 0.173 (4,40) 0.165 (4,20) 0.150 (3,80) 0.032 (0,80) 0.016 (0,40) 0.071 (1,80) R 0.035 (0,90) 0.071 (1,8) 0.110 (2,80) 0.016 (0,40) 0.189 (4,80) 0.173 (4,40) 0.029 (0,75) 0.079 (2,00) 0.039 (1,00) 0.027 (0,70) 0.102 (2,6) 0.026 (0,65) 0.630 (16,00) 0.531 (13,50) 0.018 (0,45) 0.018 (0,45) 0.079 (2,00) 0.079 (2,00) Figure 7. Package Configuration NOTES: A. B. C. D. E. All linear dimensions are in inches (millimeters). This drawing is subject to change without notice. All dimensions apply before solder dip. Package body is a clear nonfilled optically transparent material Index of refraction of clear plastic is 1.55. www.taosinc.com Powered by ICminer.com Electronic-Library Service CopyRight 2003 5 TSL256 HIGHSENSITIVITY LIGHTTOVOLTAGE CONVERTER TAOS014 – JANUARY 2000 PRODUCTION DATA — information in this document is current at publication date. Products conform to specifications in accordance with the terms of Texas Advanced Optoelectronic Solutions, Inc. standard warranty. Production processing does not necessarily include testing of all parameters. NOTICE Texas Advanced Optoelectronic Solutions, Inc. (TAOS) reserves the right to make changes to the products contained in this document to improve performance or for any other purpose, or to discontinue them without notice. Customers are advised to contact TAOS to obtain the latest product information before placing orders or designing TAOS products into systems. TAOS assumes no responsibility for the use of any products or circuits described in this document or customer product design, conveys no license, either expressed or implied, under any patent or other right, and makes no representation that the circuits are free of patent infringement. TAOS further makes no claim as to the suitability of its products for any particular purpose, nor does TAOS assume any liability arising out of the use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS, INC. PRODUCTS ARE NOT DESIGNED OR INTENDED FOR USE IN CRITICAL APPLICATIONS IN WHICH THE FAILURE OR MALFUNCTION OF THE TAOS PRODUCT MAY RESULT IN PERSONAL INJURY OR DEATH. USE OF TAOS PRODUCTS IN LIFE SUPPORT SYSTEMS IS EXPRESSLY UNAUTHORIZED AND ANY SUCH USE BY A CUSTOMER IS COMPLETELY AT THE CUSTOMER’S RISK. www.taosinc.com 6 Powered by ICminer.com Electronic-Library Service CopyRight 2003