TSL237T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS055J DECEMBER 2007
2
r
r
Copyright E 2007, TAOS Inc.
The LUMENOLOGY r Company
www.taosinc.com
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
DD
(see Note 1)
6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, OE
input, V
I
0.3 V to V
DD
+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
(see Note 2)
40癈 to 85癈
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
(see Note 2)
40癈 to 85癈
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solder conditions in accordance with JEDEC JSTD020A, maximum temperature
260癈
. . . . . . . . . . . . . . .
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:  1.  All voltage values are with respect to GND.
2.  Long-term storage or operation above 70癈 could cause package yellowing that will lower the sensitivity to wavelengths < 500nm.
Recommended Operating Conditions
MIN
NOM
MAX
UNIT
Supply voltage, V
DD
2.7
5
5.5
V
High-level input voltage, V
IH
V
DD
= 5 V
4.5
V
DD
V
Low-level input voltage, V
IL
V
DD
= 5 V
0
0.5
V
Operating free-air temperature range, T
A
40
85
癈
Electrical Characteristics at V
DD
= 5 V, T
A
= 25?/SPAN>C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
OH
High-level output voltage
I
OH
= 1 mA
4
4.7
V
V
OL
Low-level output voltage
I
OL
= 1 mA
0.1
0.4
V
I
DD
Supply current
1.6
3
mA
Full-scale frequency
!
500
1000
kHz
Temperature coefficient of responsivity
Wavelength < 600nm, f
O
= 50 kHz
?00
ppm/癈
k
SVS
Supply-voltage sensitivity
V
DD
= 5 V ?0%
?.5
%/V
!
Full-scale frequency is the maximum operating frequency of the device without saturation.
Operating Characteristics at V
DD
= 5 V, T
A
= 25?/SPAN>C, ?/SPAN>p = 640 nm (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
f
O
Output frequency
E
e
= 40.4 糤/cm
2
40
50
60
kHz
E
e
= 0 糤/cm
2
0
0.1
Hz
f
D
Dark frequency
E
e
= 0 糤/cm
2
, TA = 50癈
0
2
Hz
R
e
Irradiance responsivity
1.2
kHz/(糤/
cm
2
)
Nonlinearity
?/DIV>
f
O
= 0 kHz to 10 kHz
?%
% F.S.
Step response to full-scale step input
1 pulse of new
frequency plus 1 約
Time from OE
low to output enabled
1 period of output
frequency
?/DIV>
Nonlinearity is defined as the deviation of f
O
from a straight line between zero and full scale, expressed as a percent of full scale.
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