TSL238
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS073J  SEPTEMBER 2008
5
The LUMENOLOGY r Company
r
r
Copyright E 2008, TAOS Inc.
www.taosinc.com
TYPICAL CHARACTERISTICS
Figure 5
NORMALIZED OUTPUT FREQUENCY
vs.
ANGULAR DISPLACEMENT
Q  Angular Displacement  ?/DIV>
0
0.2
0.4
0.6
0.8
1
90
60
30
0
30
60
90
Angular Displacement is
Equal for Both Aspects
Figure 6
DARK FREQUENCY
vs.
FREE-AIR TEMPERATURE
T
A
  Free-Air Temperature  ?/SPAN>C
7.5
4.5
1.5
1.5
4.5
7.5
25
5
15
35
55
75
6.0
3.0
0.0
3.0
6.0
NOTE A
NOTE A:  Internal offsets that result in dark frequency can be both positive and negative. The dashed line represents the case of negative offset
in which an equivalent amount of light signal is required to obtain a non-zero output frequency.
Figure 7
?SPAN class="pst TSL238D-TR_2588493_3">  Wavelength of Incident Light  nm
PHOTODIODE RESPONSIVITY TEMPERATURE
COEFFICIENT vs.
WAVELENGTH OF INCIDENT LIGHT
1k
2k
3k
4k
5k
6k
7k
8k
9k
10k
0
11k
600    650   700    750    800   850    900    950   1000
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