TSL257S datasheet(4/9 Pages) AMSCO

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TSL257

HIGH-SENSITIVITY

LIGHT-TO-VOLTAGE CONVERTER

TAOS023E − SEPTEMBER 2007

The LUMENOLOGY r Company

www.taosinc.com

Switching Characteristics at VDD = 5 V, TA = 25°C, λp = 470 nm, RL = 10 kΩ (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Output pulse rise time, 10% to 90% of final value

See Note 10 and Figure 1

160

250

μs

Output pulse fall time, 10% to 90% of final value

See Note 10 and Figure 1

150

250

μs

Output settling time to 1% of final value

See Note 10 and Figure 1

330

μs

Integrated noise voltage

f = dc to 1 kHz

Ee = 0

200

μVrms

f = 10 Hz

Ee = 0

Output noise voltage, rms

f = 100 Hz

Ee = 0

μV/√Hz rms

pg ,

f = 1 kHz

Ee = 0

μ /

NOTE 10: Switching characteristics apply over the range VO = 0.1 V to 4.5 V.

PARAMETER MEASUREMENT INFORMATION

VOLTAGE WAVEFORM

TEST CIRCUIT

Input

10%

90%

Output

(see Note B)

TSL257

VDD

−

Output

Pulse

Generator

LED

(see Note A)

90%

10%

NOTES: A. The input irradiance is supplied by a pulsed InGaN light-emitting diode with the following characteristics: λp = 470 nm,

tr < 1 μs, tf < 1 μs.

B. The output waveform is monitored on an oscilloscope with the following characteristics: tr < 100 ns, Zi ≥ 1 MΩ, Ci ≤ 20 pF.

Figure 1. Switching Times

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