TSL257
HIGH-SENSITIVITY
LIGHT-TO-VOLTAGE CONVERTER
TAOS023E
−
SEPTEMBER 2007
Switching Characteristics at V
DD
= 5 V, T
A
= 25
°
C,
λ
p
= 470 nm, R
L
= 10 kΩ (unless otherwise noted)
PARAMETER
t
r
t
f
t
s
Output pulse rise time, 10% to 90% of final value
Output pulse fall time, 10% to 90% of final value
Output settling time to 1% of final value
Integrated noise voltage
V
n
Output noise voltage, rms
p
g ,
TEST CONDITIONS
See Note 10 and Figure 1
See Note 10 and Figure 1
See Note 10 and Figure 1
f = dc to 1 kHz
f = 10 Hz
f = 100 Hz
f = 1 kHz
NOTE 10: Switching characteristics apply over the range V
O
= 0.1 V to 4.5 V.
E
e
= 0
E
e
= 0
E
e
= 0
E
e
= 0
MIN
TYP
160
150
330
200
6
6
7
μ
/
μV/√Hz
rms
MAX
250
250
UNIT
μs
μs
μs
μVrms
PARAMETER MEASUREMENT INFORMATION
V
DD
Pulse
Generator
LED
(see Note A)
TSL257
1
TEST CIRCUIT
−
+
R
L
Output
(see Note B)
10%
2
E
e
Input
3
Output
t
r
90%
90%
10%
t
f
VOLTAGE WAVEFORM
NOTES: A. The input irradiance is supplied by a pulsed InGaN light-emitting diode with the following characteristics:
λ
p
= 470 nm,
t
r
< 1
μs,
t
f
< 1
μs.
B. The output waveform is monitored on an oscilloscope with the following characteristics: t
r
< 100 ns, Z
i
≥
1 MΩ, C
i
≤
20 pF.
Figure 1. Switching Times
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2007, TAOS Inc.
www.taosinc.com
3
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
