tsl238 TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS, tsl238 Datasheet

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tsl238

Manufacturer Part Number
tsl238
Description
High-sensitivity Light-to-frequency Converter
Manufacturer
TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS
Datasheet

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Part Number
Manufacturer
Quantity
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Part Number:
tsl238T
Manufacturer:
AMS
Quantity:
20 000
r
Description
Functional Block Diagram
Available Options
The LUMENOLOGY r Company
D
D
D
D
D
D
D
D
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.
High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
High Irradiance Responsivity . . .
Low Dark Frequency . . . < 2 Hz at 255 C
Single-Supply Operation . . . 2.7 V to 5.5 V
Stable 200 ppm/°C Temperature Coefficient
Interfaces Directly to a Microcontroller
Lead (Pb) Free Package
RoHS Compliant
2.3 kHz/(mW/cm
DEVICE
TSL238
Light
−25°C to 70°C
2
) at λ
Texas Advanced Optoelectronic Solutions Inc.
Photodiode
T
A
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) 673-0759
p
= 524 nm
r
8-lead Plastic Small Outline IC
r
PACKAGE − LEADS
www.taosinc.com
Current-to-Frequency
Converter
NC 2
NC 3
NC 4
NC 1
LIGHT-TO-FREQUENCY CONVERTER
PACKAGE DESIGNATOR
Output
r
D
8-LEAD SOIC
PACKAGE D
(TOP VIEW)
HIGH-SENSITIVITY
ORDERING NUMBER
TAOS073F − OCTOBER 2007
Copyright E 2007, TAOS Inc.
TSL238D
8 OUT
7 V
6 GND
5 OE
DD
TSL238
1

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tsl238 Summary of contents

Page 1

... 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 ...

Page 2

... TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073F − OCTOBER 2007 Terminal Functions TERMINAL TYPE D PKG NAME NO. GND 6 Power supply ground. All voltages are referenced to GND connection Substrate. Pin 4 is resistively connected to the substrate of the die, which is at the same potential as pin 6. ...

Page 3

... DD A TEST CONDITIONS 21.2 μW/ μW/ μW/ 50°C (Note kHz to 10 kHz O r www.taosinc.com TSL238 HIGH-SENSITIVITY TAOS073F − OCTOBER 2007 MIN TYP MAX UNIT kHz 0 1 kHz/(μW/ 2 700 nm ± ...

Page 4

... TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073F − OCTOBER 2007 OUTPUT FREQUENCY vs IRRADIANCE 1000 524 nm λ p 100 T = 25° 0.1 0.01 0.001 0.001 0.01 0 − Irradiance − μW/cm e Figure 1 SUPPLY CURRENT vs. FREE-AIR TEMPERATURE 2.0 1.6 1.2 0.8 0.4 0 − − Free-Air Temperature − °C A Figure 3 Copyright E 2007, TAOS Inc ...

Page 5

... Equal for Both Aspects −60 − − Angular Displacement − ° Figure 5 DARK FREQUENCY vs. FREE-AIR TEMPERATURE NOTE A −25 − − Free-Air Temperature − °C A Figure 6 r www.taosinc.com TSL238 HIGH-SENSITIVITY TAOS073F − OCTOBER 2007 Copyright E 2007, TAOS Inc ...

Page 6

... D independent of light intensity. The TSL238 die is trimmed to minimize the magnitude of this dark frequency component so that it can be neglected in the transfer function calculation. In many applications, measurement of the actual dark frequency may be impractical due to measurement times ranging from several seconds to several minutes, and the fact that some devices may never transition (zero dark frequency) ...

Page 7

... The LUMENOLOGY r Company LIGHT-TO-FREQUENCY CONVERTER APPLICATION INFORMATION r www.taosinc.com TSL238 HIGH-SENSITIVITY TAOS073F − OCTOBER 2007 Copyright E 2007, TAOS Inc ...

Page 8

... TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073F − OCTOBER 2007 This SOIC package consists of an integrated circuit mounted on a lead frame and encapsulated with an electrically nonconductive clear plastic compound having an index of refraction of 1.55. PACKAGE D TOP VIEW PIN 1.27 END VIEW 0.50 0.88 TYP TOP OF 0.25 455 1 ...

Page 9

... DETAIL B , and K are defined in ANSI EIA Standard 481−B 2001 Figure 9. Package D Carrier Tape r www.taosinc.com TSL238 HIGH-SENSITIVITY TAOS073F − OCTOBER 2007 0.292 + 0.013 [0.0115 + 0.0005] END VIEW 1.75 + 0.10 [0.069 + 0.004] 5.50 + 0.05 [0.217 + 0.002 0.3 − 0.1 [0.472 + 0.12 − 0.004] 5.13 + 0.10 [0.202 + 0.004] ...

Page 10

... Time above T peak Peak temperature in reflow Temperature gradient in cooling T peak Time (sec) Copyright E 2007, TAOS Inc. 10 MANUFACTURING INFORMATION Table 1. TSL238 Solder Reflow Profile PARAMETER REFERENCE t soak −10° peak t soak Figure 10. Solder Reflow Profile Graph r www ...

Page 11

... Bake only a quantity of devices that can be processed through solder reflow in 24 hours. Devices can be re−baked for 4 hours in tape, at 90°C for a cumulative total of 12 hours (3 bakes for 4 hours at 90°C). The LUMENOLOGY r Company LIGHT-TO-FREQUENCY CONVERTER r www.taosinc.com TSL238 HIGH-SENSITIVITY TAOS073F − OCTOBER 2007 Copyright E 2007, TAOS Inc ...

Page 12

... TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073F − OCTOBER 2007 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. ...

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