TSL230R, TSL230AR, TSL230BR
PROGRAMMABLE LIGHT TO FREQUENCY CONVERTERS
TAOS048 OCTOBER 2002
1
The
LUMENOLOGY
r
Company
t
t
Copyright
E
2002, TAOS Inc.
www.taosinc.com
D
High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
D
Programmable Sensitivity and Full-Scale
Output Frequency
D
Communicates Directly With a Microcontroller
D
Single-Supply Operation Down to 2.7 V,
With Power-Down Feature
D
Absolute Output Frequency Tolerance of
5% (TSL230BR)
D
Nonlinearity Error Typically 0.2% at 100 kHz
D
Stable 150 ppm/
C Temperature Coefficient
D
Replacements for TSL230, TSL230A, and
TSL230B
Description
The TSL230R, TSL230AR, and TSL230BR programmable light-to-frequency converters combine a
configurable silicon photodiode and a current-to-frequency converter on single monolithic CMOS integrated
circuits. The output can be either a pulse train or a square wave (50% duty cycle) with frequency directly
proportional to light intensity. Device sensitivity is selectable in three ranges, providing two decades of
adjustment. The full-scale output frequency can be scaled by one of four preset values. All inputs and the output
are TTL compatible, allowing direct two-way communication with a microcontroller for programming and output
interface. An output enable (OE) is provided that places the output in the high-impedance state for multiple-unit
sharing of a microcontroller input line.
The devices are available with absolute-output-frequency tolerances of
5% (TSL230BR),
10% (TSL230AR),
or
20% (TSL230R). They have been temperature compensated for the ultraviolet-to-visible light range of
320 nm to 700 nm and respond over the light range of 320 nm to 1050 nm. The devices are characterized over
the temperature range of 25
C to 70
C.
Functional Block Diagram
Light
Current-to-Frequency
Converter
Photodiode Array
S0
S1
S2
S3
OE
Output
t
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S
Plano, TX 75074
S
(972) 673-0759
2
3
4
8
7
6
5
S0
S1
OE
GND
S3
S2
OUT
V
DD
PACKAGE P
8-LEAD PDIP
(TOP VIEW)
TSL230R, TSL230AR, TSL230BR
PROGRAMMABLE LIGHT TO FREQUENCY CONVERTERS
TAOS048 OCTOBER 2002
2
t
t
Copyright
E
2002, TAOS Inc.
The
LUMENOLOGY
r
Company
www.taosinc.com
Terminal Functions
TERMINAL
TYPE
DESCRIPTION
NAME
NO.
TYPE
DESCRIPTION
GND
4
Ground
OE
3
I
Enable for f
O
(active low)
OUT
6
O
Scaled-frequency (f
O
) output
S0, S1
1, 2
I
Sensitivity-select inputs
S2, S3
7, 8
I
f
O
scaling-select inputs
V
DD
5
Supply voltage
Selectable Options
S1
S0
SENSITIVITY
S3
S2
f
O
SCALING (divide-by)
L
L
Power down
L
L
1
L
H
1
L
H
2
H
L
10
H
L
10
H
H
100
H
H
100
Available Options
DEVICE
T
A
PACKAGE LEADS
PACKAGE DESIGNATOR
ORDERING NUMBER
TSL230R
25
C to 85
PDIP8
P
TSL230RP
TSL230AR
25
C to 85
PDIP8
P
TSL230ARP
TSL230BR
25
C to 85
PDIP8
P
TSL230BRP
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
DD
(see Note 1)
6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, all inputs, V
I
0.3 V to V
DD
+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
25
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
25
C to 85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
NOTE 1: All voltage values are with respect to GND.
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
= 4.5 V to 5.5 V
2
V
DD
V
Low-level input voltage, V
IL
V
DD
= 4.5 V to 5.5 V
0
0.8
V
Operating free-air temperature range, T
A
25
70
C
TSL230R, TSL230AR, TSL230BR
PROGRAMMABLE LIGHT TO FREQUENCY CONVERTERS
TAOS048 OCTOBER 2002
3
The
LUMENOLOGY
r
Company
t
t
Copyright
E
2002, TAOS Inc.
www.taosinc.com
Electrical Characteristics at T
A
= 25
C, V
DD
= 5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
OH
High-level output voltage
I
OH
= 4 mA
4
4.5
V
V
OL
Low-level output voltage
I
OL
= 4 mA
0.25
0.4
V
I
IH
High-level input current
5
A
I
IL
Low-level input current
5
A
I
Supply current
Power-on mode
2
3
mA
I
DD
Supply current
Power-down mode
5
12
A
F.S.
Full-scale frequency
1.1
MHz
Temperature coefficient of output frequency
700 nm
150
ppm/
C
k
SVS
Supply voltage sensitivity
V
DD
= 5 V
10%
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
C, E
e
= 130
W/cm
2
,
p
= 640 nm (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
TSL230R
TSL230AR
TSL230BR
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
S0 = S1 = H,
S2 = S3 = L
80
100
120
90
100
110
95
100
105
kHz
S1 = H,
S0 = S2 = S3 = L
8
10
12
9
10
11
9.5
10
10.5
kHz
S0 = H,
S1 = S2 = S3 = L
0.8
1
1.2
0.9
1
1.1
0.95
1
1.05
kHz
f
O
Output frequency
S0 = S1 = S2 = H,
S3 = L
40
50
60
45
50
55
47.5
50
52.5
kHz
S0 = S1 = S3 = H,
S2 = L
8
10
12
9
10
11
9.5
10
10.5
kHz
S0 = S1 = S2 = S3 = H
0.8
1
1.2
0.9
1
1.1
0.95
1
1.05
kHz
E
e
= 0,
S0 = S1 = H,
S2 = S3 = L
0.4
10
0.4
10
0.4
10
Hz
R
e
Responsivity
S0 = S1 = H,
S2 = S3 = L
0.77
0.77
0.77
kHz/
(
J/
cm
2
)
t
Output pulse
S2 = S3 = L
125
600
125
600
125
600
ns
t
w
Out ut ulse
duration
S2 or S3 = H
1/2f
O
1/2f
O
1/2f
O
s
f
O
= 0 MHz to 10 kHz
0.1%
0.1%
0.1%
%F.S.
Nonlinearity
#
f
O
= 0 MHz to 100 kHz
0.2%
0.2%
0.2%
%F.S.
Nonlinearity
f
O
= 0 MHz to 1 MHz
0.5%
0.5%
0.5%
%F.S.
Recovery from
power down
100
100
100
s
Step response to
full-scale step input
1 pulse of new frequency plus 1
s
Response time to
programming
change
2 periods of new principal frequency
plus 1
s
Response time to
output enable (OE)
50
150
50
150
50
150
ns
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.
#
Nonlinearity test condition: S0 = S1 = H, S2 = S3 = L.
Principal frequency is the internal oscillator frequency, equivalent to divide-by-1 output selection.
TSL230R, TSL230AR, TSL230BR
PROGRAMMABLE LIGHT TO FREQUENCY CONVERTERS
TAOS048 OCTOBER 2002
4
t
t
Copyright
E
2002, TAOS Inc.
The
LUMENOLOGY
r
Company
www.taosinc.com
TYPICAL CHARACTERISTICS
Figure 1
1
0.1
0.01
0.001
0.001 0.01 0.1
1
10
Output Frequency kHz
10
100
OUTPUT FREQUENCY
vs
IRRADIANCE
100
1 k
E
e
Irradiance
W/cm
2
f O
S0 = L, S1 = H
S0 = H, S1 = L
V
DD
= 5 V
p
= 640 nm
T
A
= 25
C
S2 = S3 = L
1000
10 k 100 k 1 M
S0 = H, S1 = H
Figure 2
300
400
500
600
700
1000
800
900
1100
Wavelength nm
Normalized Responsivity
0
0.2
0.4
0.6
0.8
1.0
1.2
PHOTODIODE SPECTRAL RESPONSIVITY
Figure 3
DARK FREQUENCY
vs
TEMPERATURE
T
A
Temperature
C
25
0
25
50
75
0
0.2
0.4
0.6
0.8
1
1.2
f
O(dark)
-- Dark Frequency -- Hz
V
DD
= 5 V
E
e
= 0
S0 = S1 = H
S2 = S3 = L
Figure 4
Wavelength of Incident Light nm
V
DD
= 5 V
TEMPERATURE COEFFICIENT
OF OUTPUT FREQUENCY
vs
WAVELENGTH OF INCIDENT LIGHT
0
1000
2000
3000
4000
5000
6000
7000
300
400
500
600
700
1000
800
900
T
emperature
Coefficient of Output Frequency -- ppm/
5
C
TSL230R, TSL230AR, TSL230BR
PROGRAMMABLE LIGHT TO FREQUENCY CONVERTERS
TAOS048 OCTOBER 2002
5
The
LUMENOLOGY
r
Company
t
t
Copyright
E
2002, TAOS Inc.
www.taosinc.com
TYPICAL CHARACTERISTICS
OUTPUT FREQUENCY
vs
SUPPLY VOLTAGE
V
DD
Supply Voltage V
Normalized Output Frequency
2.5
3
3.5
4
4.5
5
0.980
0.985
0.990
0.995
1.000
1.005
1.010
5.5
T
A
= 25
C
f
O
= 100 kHz
Figure 5
APPLICATION INFORMATION
Power-supply considerations
Power-supply lines must be decoupled by a 0.01-
F to 0.1-
F capacitor with short leads placed close to the
TSL230 device package. A low-noise power supply is required to minimize jitter on output pulses.
Input interface
A low-impedance electrical connection between the device OE pin and the device GND pin is required for
improved noise immunity.
Output interface
The output of the device is designed to drive a standard TTL or CMOS logic input over short distances. If lines
greater than 12 inches are used on the output, a buffer or line driver is recommended.
Sensitivity adjustment
Sensitivity is controlled by two logic inputs, S0 and S1. Sensitivity is adjusted using an electronic iris technique
-- effectively an aperture control -- to change the response of the device to a given amount of light. The
sensitivity can be set to one of three levels: 1
, 10
or 100
, providing two decades of adjustment. This allows
the responsivity of the device to be optimized to a given light level while preserving the full-scale
output-frequency range. Changing of sensitivity also changes the effective photodiode area by the same factor.
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