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TSL251RD

LIGHT-TO-VOLTAGE OPTICAL SENSORS

Unspecified 

TSL250RD, TSL251RD, TSL260RD, TSL261RD

LIGHT-TO-VOLTAGE OPTICAL SENSORS

TAOS050K − OCTOBER 2007

APPLICATION INFORMATION

Power Supply Considerations

For optimum device performance, power-supply lines should be decoupled by a 0.01-μF to 0.1-μF capacitor

with short leads connected between VDD and GND mounted close to the device package.

Device Operational Details

The voltage developed at the output pin (OUT) is given by:

where:

VO

VD

Re

Ee

VO = VD + (Re) (Ee)

is the output voltage

is the output voltage for dark condition (Ee = 0)

is the device responsivity for a given wavelength of light given in mV/(μW/cm2)

is the incident irradiance in μW/cm2

VD is a fixed offset voltage resulting primarily from the input offset voltage of the internal op amp. As shown in

the equation above, this voltage represents a constant, light-independent term in the total output voltage VO.

At low light levels, this offset voltage can be a significant percentage of VO. For optimum performance of any

given device over the full output range, the value of VD should be measured (in the absence of light) and later

subtracted from all subsequent light measurements (see Figures 2 and 3).

PCB Pad Layout

Suggested PCB pad layout guidelines for the D package is shown in Figure 9.

4.65

6.90

1.27

2.25

0.50

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

Figure 9. Suggested D Package PCB Layout

Copyright E 2007, TAOS Inc.

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