TSL238T datasheet(2/12 Pages) TAOS

2 / 12 page

TSL238T

HIGH-SENSITIVITY

LIGHT-TO-FREQUENCY CONVERTER

TAOS080E − JUNE 2007

The LUMENOLOGY r Company

www.taosinc.com

Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage, VDD (see Note 1)

6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI

−0.3 V to VDD +0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output current, IO

± 5 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Short circuit of output to ground duration

5 s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA

−40°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, Tstg

−40°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Solder conditions in accordance with JEDEC, J−STD−020C

260°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to GND.

Recommended Operating Conditions

MIN

NOM

MAX

UNIT

Supply voltage, VDD

2.7

5.5

High-level input voltage, VIH

0.8

× VDD

VDD

Low-level input voltage, VIL

0.5

Operating free-air temperature range, TA

−40

°C

Electrical Characteristics at VDD = 5 V, TA = 25°C, λp = 640 nm (Note 1) (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOH

High-level output voltage

IOH = −1 mA

4.5

VOL

Low-level output voltage

IOL = 1 mA

0.25

0.4

IIH

High-level input current

−10

μA

IIH

Low-level input current

−10

μA

IDD

Supply current

Ee = 14.7 μW/cm2

Full-scale frequency (Note 2)

TA = 50°C (Note 3)

500

1000

kHz

Temperature coefficient of output frequency

Wavelength < 700nm, fO = 50 kHz

± 200

ppm/°C

kSVS

Supply-voltage sensitivity

VDD = 5 V ±10%

± 0.5

%/ V

NOTES: 1. The input irradiance is supplied with red LED light source with peak wavelength = 640 nm.

2. Full-scale frequency is the maximum frequency of the device without saturation. Higher irradiance will not result in any additional

increase of output frequency. The output frequency will remain at approximately the saturation frequency to a minimum of 1000

μW/sq−cm 640-nm irradiance. During production testing, devices are not tested at this very high irradiance level.

3. Measured at wafer probe using 50°C hot chuck.

Operating Characteristics at VDD = 5 V, TA = 25°C, λp = 640 nm (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Output frequency

Ee = 14.7 μW/cm2

kHz

Dark frequency

Ee = 0 μW/cm2

0.3

Dark frequency

Ee = 0 μW/cm2, TA = 50°C (Note 1)

Irradiance responsivity

3.4

kHz/(μW/

cm2)

λp

Peak response wavelength

700

Nonlinearity (Note 2)

fO = 0 kHz to 10 kHz

± 1%

%F.S.

NOTES: 1. Measured at wafer probe using 50°C hot chuck.

2. Nonlinearity is defined as the deviation from a straight line between zero and maximum of stated range, expressed as a percent

of stated range.

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