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TSL257T
HIGH-SENSITIVITY
LIGHT-TO-VOLTAGE CONVERTER
TAOS065B
−
APRIL 2007
D
Converts Light Intensity to Output Voltage
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Monolithic Silicon IC Containing
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D
Single Voltage Supply Operation (2.7 V to
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5.5 V)
High Irradiance Responsivity . . . Typical
680 mV/(μW/cm
2
) at
λ
p
= 640 nm
Low Noise (200
μVrms
Typ to 1 kHz)
Rail-to-Rail Output
High Power-Supply Rejection (35 dB at
1 kHz)
Low-Profile Surface-Mount Package
RoHS Compliant
Photodiode, Operational Amplifier, and
Feedback Components
High Sensitivity
N/C 1
GND 2
PACKAGE T
4-LEAD SMD
(TOP VIEW)
4 OUT
3 V
DD
Description
The TSL257T 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 TSL257T has a transimpedance gain of
320 MΩ. The device has improved offset voltage stability and low power consumption and is supplied in a
compact 4-lead surface-mount package.
Functional Block Diagram
−
+
Voltage
Output
Terminal Functions
TERMINAL
NAME
GND
OUT
V
DD
N/C
T PKG
NO.
2
4
3
1
Output voltage.
Supply voltage.
No connection.
DESCRIPTION
Power supply 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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Copyright
E
2007, TAOS Inc.
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
