Datasheet

TSL235R
LIGHT-TO-FREQUENCY CONVERTER
TAOS038E −SEPTEMBER 2007
3
The LUMENOLOGY r Company
r
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
TYPICAL CHARACTERISTICS
1
0.1
0.01
0.001
0.001 0.01 0.1 1 10
10
100
OUTPUT FREQUENCY
vs
IRRADIANCE
100 1 k
E
e
− Irradiance − μW/cm
2
V
DD
= 5 V
λ
p
= 635 nm
T
A
= 25°C
1000
f
O
— Output Frequency — kHz
Figure 1
Figure 2
300 400 500 600 700 1000800 900 1100
λ − Wavelength − nm
Normalized Responsivity
0
0.2
0.4
0.6
0.8
1.0
1.2
PHOTODIODE SPECTRAL RESPONSIVITY
DARK FREQUENCY
vs
TEMPERATURE
V
DD
= 5 V
E
e
= 0
T
A
− Temperature − °C
λ − Wavelength of Incident Light − nm
V
DD
= 5 V
TEMPERATURE COEFFICIENT
OF OUTPUT FREQUENCY
vs
WAVELENGTH OF INCIDENT LIGHT
−25 0 25 50 75
0
0.2
0.4
0.6
0.8
1
1.2
0
1000
2000
3000
4000
5000
6000
7000
300 400 500 600 700 1000800 900
Temperature Coefficient of Output Frequency — ppm/5C
f
O(dark)
— Dark Frequency — Hz
Figure 3
Figure 4