TSL257T datasheet(2/11 Pages) AMSCO

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TSL257T

HIGH-SENSITIVITY

LIGHT-TO-VOLTAGE CONVERTER

TAOS065B − APRIL 2007

The LUMENOLOGY r Company

www.taosinc.com

D Converts Light Intensity to Output Voltage

D Monolithic Silicon IC Containing

Photodiode, Operational Amplifier, and

Feedback Components

D High Sensitivity

D Single Voltage Supply Operation (2.7 V to

5.5 V)

D High Irradiance Responsivity ...Typical

680 mV/(μW/cm2) at λp = 640 nm

D Low Noise (200 μVrms Typ to 1 kHz)

D Rail-to-Rail Output

D High Power-Supply Rejection (35 dB at

1 kHz)

D Low-Profile Surface-Mount Package

D RoHS Compliant

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

T PKG

NO.

DESCRIPTION

GND

Power supply ground (substrate). All voltages are referenced to GND.

OUT

Output voltage.

VDD

Supply voltage.

N/C

No connection.

Texas Advanced Optoelectronic Solutions Inc.

1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) 673-0759

PACKAGE T

4-LEAD SMD

(TOP VIEW)

N/C 1

GND 2

4 OUT

3 VDD

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