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TSL257
HIGH-SENSITIVITY
LIGHT-TO-VOLTAGE CONVERTER
TAOS023E
−
SEPTEMBER 2007
D
Converts Light Intensity to Output Voltage
D
Monolithic Silicon IC Containing
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D
Single Voltage Supply Operation (2.7 V to
D
D
D
D
D
5.5 V)
Low Noise (200
μVrms
Typ to 1 kHz)
Rail-to-Rail Output
High Power-Supply Rejection (35 dB at
1 kHz)
Compact 3-Leaded Plastic Package
RoHS Compliant (−LF Package Only)
Photodiode, Operational Amplifier, and
Feedback Components
High Sensitivity
PACKAGE S
SIDELOOKER
(FRONT VIEW)
PACKAGE SM
SURFACE MOUNT
SIDELOOKER
(FRONT VIEW)
1
GND
2
V
DD
3
OUT
Description
1
GND
2
V
DD
3
OUT
The TSL257 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. Output voltage is directly
proportional to light intensity (irradiance) on the photodiode. The TSL257 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. When supplied in the lead (Pb) free package, the device is
RoHS compliant.
Functional Block Diagram
−
+
Voltage
Output
Available Options
DEVICE
TSL257
TSL257
TSL257
T
A
0°C to 70°C
0°C to 70°C
0°C to 70°C
PACKAGE
−
LEADS
3-lead Sidelooker
3-lead Sidelooker — Lead (Pb) Free
3-lead Surface-Mount Sidelooker — Lead (Pb) Free
PACKAGE DESIGNATOR
S
S
SM
ORDERING NUMBER
TSL257
TSL257−LF
TSL257SM−LF
Terminal Functions
TERMINAL
NAME
GND
OUT
V
DD
NO.
1
3
2
Output voltage
Supply voltage
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Copyright
E
2007, TAOS Inc.
DESCRIPTION
Ground (substrate). All voltages are referenced to GND.
The
LUMENOLOGY
r
Company
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
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www.taosinc.com
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TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
