TSL238 datasheet(2/12 Pages) TAOS

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TSL238

HIGH-SENSITIVITY

LIGHT-TO-FREQUENCY CONVERTER

TAOS073F − OCTOBER 2007

The LUMENOLOGY r Company

www.taosinc.com

Terminal Functions

TERMINAL

NAME

D PKG

NO.

TYPE

DESCRIPTION

GND

Power supply ground. All voltages are referenced to GND.

1, 2, 3

No connection.

Substrate. Pin 4 is resistively connected to the substrate of the die, which is at the same potential as pin 6.

Pin 4 must either be connected to pin 6 or left unconnected. Pin 4 cannot be used for a ground connection

by itself.

Enable for fO (active low).

OUT

Output frequency.

VDD

Supply voltage.

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

−25°C to 70°C

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

Storage temperature range, Tstg

−40°C to 85°C

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

Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature (see Note 2)

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.

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

2. The device may be hand soldered provided that heat is applied only to the solder pad and no contact is made between the tip of

the solder iron and the device lead. The maximum time heat should be applied to the device is 5 seconds.

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

−25

°C

Electrical Characteristics at VDD = 5 V, TA = 25°C (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 = 21.2 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 green LED light source with peak wavelength = 524 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/sqcm 524-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.

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