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PDF TSL238T Data sheet ( Hoja de datos )
| Número de pieza | TSL238T | |
| Descripción | HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER | |
| Fabricantes | TAOS | |
| Logotipo |  |
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D High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
D High Irradiance Responsivity . . .
3.4 kHz/(mW/cm2) at λp = 640 nm
D Low Dark Frequency . . . < 6 Hz at 505 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
TSL238T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS080G − DECEMBER 2007
PACKAGE T
4-LEAD SMD
(TOP VIEW)
OE 1
4 OUT
GND 2
3 VDD
Description
The TSL238T 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. Output enable (OE) places the output in a high-impedance state for
multiple-unit sharing of a microcontroller input line. 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 TSL238T is characterized for operation over the temperature range of −40°C to 85°C and is supplied in
a compact 4-lead surface-mount package that is lead (Pb) free and RoHS compliant.
Functional Block Diagram
Light
Photodiode
Current-to-Frequency
Converter
Output
Available Options
DEVICE
TSL238T
TA
−40°C to 85°C
PACKAGE − LEADS
4-lead Low Profile Surface Mount
PACKAGE DESIGNATOR ORDERING NUMBER
T TSL238T
Terminal Functions
TERMINAL
NAME
T PKG
NO.
GND
2
OE 1
OUT
4
VDD
3
TYPE
I
O
DESCRIPTION
Power supply ground (substrate). All voltages are referenced to GND.
Enable for fO (active low).
Output frequency.
Supply voltage.
The
LUMENOLOGY
r
Company
Texas
Advarnced
Optoelectronic
Solutions
Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2007, TAOS Inc.
1
1 page  
TSL238T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS080G − DECEMBER 2007
TYPICAL CHARACTERISTICS
NORMALIZED OUTPUT VOLTAGE
vs.
ANGULAR DISPLACEMENT
1
NORMALIZED OUTPUT VOLTAGE
vs.
ANGULAR DISPLACEMENT
1
0.8 0.8
0.6 0.6
0.4 0.4
0.2 0.2
0 -Q
+Q
−90 −60 −30 0 30 60
Q − Angular Displacement − °
Figure 5
90
0 -Q
+Q
−90 −60 −30 0 30 60
Q − Angular Displacement − °
Figure 6
90
7.5
6.0
4.5
3.0
1.5
0.0
−1.5
−3.0
−4.5
−6.0
−7.5
−25
DARK FREQUENCY
vs.
FREE-AIR TEMPERATURE
NOTE A
−5 15 35 55
TA − Free-Air Temperature − °C
Figure 7
75
PHOTODIODE RESPONSIVITY TEMPERATURE
COEFFICIENT
vs.
WAVELENGTH OF INCIDENT LIGHT
11k
10k
9k
8k
7k
6k
5k
4k
3k
2k
1k
0
600 650 700 750 800 850 900 950 1000
λ − Wavelength of Incident Light − nm
Figure 8
NOTE A: Internal offsets that result in dark frequency can be both positive and negative. The dashed line represents the case of negative offset
in which an equivalent amount of light signal is required to obtain a non-zero output frequency.
The LUMENOLOGY r Company
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
r
5
5 Page 
TSL238T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS080G − DECEMBER 2007
MANUFACTURING INFORMATION
Moisture Sensitivity
Optical characteristics of the device can be adversely affected during the soldering process by the release and
vaporization of moisture that has been previously absorbed into the package molding compound. To ensure the
package molding compound contains the smallest amount of absorbed moisture possible, each device is
dry−baked prior to being packed for shipping. Devices are packed in a sealed aluminized envelope with silica
gel to protect them from ambient moisture during shipping, handling, and storage before use.
This package has been assigned a moisture sensitivity level of MSL 3 and the devices should be stored under
the following conditions:
Temperature Range
Relative Humidity
Total Time
Opened Time
5°C to 50°C
60% maximum
6 months from the date code on the aluminized envelope — if unopened
168 hours or fewer
Rebaking will be required if the devices have been stored unopened for more than 6 months or if the aluminized
envelope has been open for more than 168 hours. If rebaking is required, it should be done at 90°C for 4 hours.
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2007, TAOS Inc.
11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TSL238T.PDF ] | |
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