TSL237
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS052G
−
SEPTEMBER 2007
TYPICAL CHARACTERISTICS
OUTPUT FREQUENCY
vs
IRRADIANCE
1000
V
DD
= 5 V
λ
p
= 524 nm
T
A
= 25°C
Normalized Responsivity
1
PHOTODIODE SPECTRAL RESPONSIVITY
Output Frequency (f
O
−
f
D
) — kHz
100
0.8
10
0.6
1
0.4
0.1
0.01
0.2
0.001
0.001
0.01
0.1
1
10
10 0
1k
0
300
400
500
600
700
800
900
1000 1100
E
e
−
Irradiance
−
μW/cm
2
λ
−
Wavelength
−
nm
Figure 1
SUPPLY CURRENT
vs.
FREE-AIR TEMPERATURE
2.0
f
O
— Output Frequency — Normalized
1.100
1.075
1.050
1.025
1.000
0.975
0.950
0.925
0.900
−25
Figure 2
OUTPUT FREQUENCY
vs.
FREE-AIR TEMPERATURE
I
DD
— Supply Current — mA
1.6
1.2
0.8
0.4
0
−25
−5
15
35
55
T
A
−
Free-Air Temperature
−
°C
75
−5
15
35
55
T
A
−
Free-Air Temperature
−
°C
75
Figure 3
Figure 4
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2007, TAOS Inc.
www.taosinc.com
3
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
