r
r
TSL230RD, TSL230ARD, TSL230BRD
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS054P
−
OCTOBER 2007
D
High-Resolution Conversion of Light
D
Intensity to Frequency With No External
Components
Programmable Sensitivity and Full-Scale
Output Frequency
PACKAGE D
8-LEAD SOIC
(TOP VIEW)
S0 1
S1 2
OE 3
GND 4
8 S3
7 S2
6 OUT
5 V
DD
D
Communicates Directly With a Microcontroller
D
High Irradiance Responsivity . . .
D
D
D
D
D
790 Hz/(mW/cm
2
) Typical at 640 nm
Single-Supply Operation . . . 2.7 V to 5.5 V
Power-Down Feature . . . 5
mA
Typical
Nonlinearity Error Typically 0.2% at 100 kHz
Stable 200 ppm/°C Temperature Coefficient
Low-Profile Lead (Pb) Free and RoHS
Compliant Surface-Mount Package
Description
The TSL230RD, TSL230ARD, and TSL230BRD programmable light-to-frequency converters combine a
configurable silicon photodiode and a current-to-frequency converter on single monolithic CMOS integrated
circuit. 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. The output enable (OE) 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
±10%
(TSL230BRD),
±15%
(TSL230ARD), and
±20%
(TSL230RD). 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
Output
Light
Photodiode Array
Current-to-Frequency
Converter
OE
S0
S1
S2
S3
The
LUMENOLOGY
r
Company
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
r
www.taosinc.com
1
r
Copyright
E
2007, TAOS Inc.
TSL230RD, TSL230ARD, TSL230BRD
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS054P
−
OCTOBER 2007
Terminal Functions
TERMINAL
NAME
GND
OE
OUT
S0, S1
S2, S3
V
DD
NO.
4
3
6
1, 2
7, 8
5
I
O
I
I
TYPE
Ground
Enable for f
O
(active low)
Scaled-frequency (f
O
) output
Sensitivity-select inputs
f
O
scaling-select inputs
Supply voltage
DESCRIPTION
Selectable Options
S1
L
L
H
H
S0
L
H
L
H
SENSITIVITY
Power down
1
×
10
×
100
×
S3
L
L
H
H
S2
L
H
L
H
f
O
SCALING (divide-by)
1
2
10
100
Available Options
DEVICE
TSL230RD
TSL230ARD
TSL230BRD
T
A
−25°C
to 70°C
−25°C
to 70°C
−25°C
to 70°C
PACKAGE
−
LEADS
SOIC−8
SOIC−8
SOIC−8
PACKAGE DESIGNATOR
D
D
D
ORDERING NUMBER
TSL230RD
TSL230ARD
TSL230BRD
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−40°C
to 85°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−40°C
to 85°C
Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature (see Note 2) . . . 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.
NOTES: 1. All voltage values are with respect to GND.
2. The device may be hand soldered provided that heat is applied only to the solder pad and no contact is made between the tip of
the solder iron and the device lead. The maximum time heat should be applied to the device is 5 seconds.
Recommended Operating Conditions
MIN
Supply voltage, V
DD
High-level input voltage, V
IH
Low-level input voltage, V
IL
Operating free-air temperature range, T
A
Copyright
E
2007, TAOS Inc.
NOM
5
MAX
5.5
V
DD
0.8
70
UNIT
V
V
V
°C
2.7
V
DD
= 4.5 V to 5.5 V
V
DD
= 4.5 V to 5.5 V
2
0
−25
r
r
The
LUMENOLOGY
r
Company
2
www.taosinc.com
TSL230RD, TSL230ARD, TSL230BRD
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS054P
−
OCTOBER 2007
Electrical Characteristics at T
A
= 25°C, V
DD
= 5 V (unless otherwise noted)
PARAMETER
V
OH
V
OL
I
IH
I
IL
I
DD
F.S.
k
SVS
High-level output voltage
Low-level output voltage
High-level input current
Low-level input current
Supply current
Full-scale frequency (See Note 3)
Temperature coefficient of output frequency
Supply voltage sensitivity
Power-on mode
Power-down mode
S0=S1=H, S2=S3=L
λ ≤
700 nm (See Note 4)
V
DD
= 5 V
±10%
1.1
±
200
±
0.5
2
5
TEST CONDITIONS
I
OH
=
−
4 mA
I
OL
= 4 mA
MIN
4
TYP
4.5
0.25
0.4
5
5
3
12
MAX
UNIT
V
V
μA
μA
mA
μA
MHz
ppm/°C
%/ V
NOTES: 3. Full-scale frequency is the maximum operating frequency of the device without saturation.
4. The temperature coefficient of output frequency is measured with constant irradiance as the temperature is varied between
−25°C
and 70°C. The constant irradiance is sufficiently high that the output frequency is much greater than the dark frequency over the
entire temperature range.
Operating Characteristics at V
DD
= 5 V, T
A
= 25°C, E
e
= 126
μW/cm
2
,
λ
p
= 640 nm (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
S0 = S1 = H,
S2 = S3 = L
S1 = H,
S0 = S2 = S3 = L
f
O
Output frequency
S0 = H,
S1 = S2 = S3 = L
S0 = S1 = S2 = H,
S3 = L
S0 = S1 = S3 = H,
S2 = L
S0 = S1 = S2 = S3 = H
f
D
R
e
t
w
Dark frequency
Responsivity
Output pulse
duration
Nonlinearity
(See Notes 5 and 6)
E
e
= 0, S0 = S1 = H,
S2 = S3 = L
S0 = S1 = H,
S2 = S3 = L
S2 = S3 = L
S2 or S3 = H
f
O
= 0 MHz to 10 kHz
f
O
= 0 MHz to 100 kHz
f
O
= 0 MHz to 1 MHz
125
1/2f
O
±
0.1%
±
0.2%
±
0.5%
100
TSL230RD
MIN
80
8
0.8
40
8
0.8
TYP
100
10
1
50
10
1
0.4
0.79
600
125
1/2f
O
±
0.1%
±
0.2%
±
0.5%
100
1 pulse of new frequency plus 1
μs
2 periods of new principal frequency plus 1
μs
(Note 7)
50
150
50
150
50
150
ns
MAX
120
12
1.2
60
12
1.2
10
TSL230ARD
MIN
85
8.5
0.85
42.5
8.5
0.85
TYP
100
10
1
50
10
1
0.4
0.79
600
125
1/2f
O
±
0.1%
±
0.2%
±
0.5%
100
μs
%F.S.
MAX
115
11.5
1.15
57.5
11.5
1.15
10
TSL230BRD
MIN
90
9
0.9
45
9
0.9
TYP
100
10
1
50
10
1
0.4
0.79
600
MAX
110
11
1
55
11
1.1
10
Hz
kHz/
(μW/
cm
2
)
ns
s
UNIT
kHz
Recovery from power down
Step response to full-scale step input
Response time to programming change
Response time to output enable (OE)
NOTES: 5. 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.
6. Nonlinearity test condition: S0 = S1 = H, S2 = S3 = L.
7. Principal frequency is the internal oscillator frequency, equivalent to divide-by-1 output selection.
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2007, TAOS Inc.
www.taosinc.com
3
TSL230RD, TSL230ARD, TSL230BRD
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS054P
−
OCTOBER 2007
TYPICAL CHARACTERISTICS
OUTPUT FREQUENCY
vs
IRRADIANCE
1000
V
DD
= 5 V
λ
p
= 640 nm
T
A
= 25°C
S2 = S3 = L
S0 = H, S1 = H
1.2
PHOTODIODE SPECTRAL RESPONSIVITY
Output Frequency (f
O
−
f
D
) — kHz
100
1.0
Normalized Responsivity
10
0.8
1
0.6
0.1
S0 = L, S1 = H
0.4
0.01
S0 = H, S1 = L
0.2
0.001
0.001 0.01 0.1
1
10
100
1k
10k 100k
1M
0
300
400
500
600
700
800
900
1000 1100
E
e
−
Irradiance
−
μW/cm
2
λ
−
Wavelength
−
nm
Figure 1
Figure 2
TEMPERATURE COEFFICIENT
OF OUTPUT FREQUENCY
vs
WAVELENGTH OF INCIDENT LIGHT
7000
6000
5000
4000
3000
2000
1000
0
300
V
DD
= 5 V
1.2
1
f
D
— Dark Frequency — Hz
V
DD
= 5 V
E
e
= 0
S0 = S1 = H
S2 = S3 = L
0.8
0.6
0.4
0.2
0
−25
0
25
50
75
Temperature Coefficient of Output Frequency — ppm/5C
DARK FREQUENCY
vs
TEMPERATURE
400
500
600
700
800
900
1000
T
A
−
Temperature
−
°C
λ
−
Wavelength of Incident Light
−
nm
Figure 3
Figure 4
Copyright
E
2007, TAOS Inc.
r
r
The
LUMENOLOGY
r
Company
4
www.taosinc.com
TSL230RD, TSL230ARD, TSL230BRD
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS054P
−
OCTOBER 2007
TYPICAL CHARACTERISTICS
OUTPUT FREQUENCY
vs
SUPPLY VOLTAGE
1.010
T
A
= 25°C
f
O
= 100 kHz
1.005
Normalized Output Frequency
1.000
0.995
0.990
0.985
0.980
2.5
3
3.5
4
4.5
5
5.5
V
DD
−
Supply Voltage
−
V
Figure 5
NORMALIZED OUTPUT FREQUENCY
vs.
ANGULAR DISPLACEMENT
1
f
O
— Output Frequency — Normalized
0.8
Optical Axis
Angular Displacement is
Equal for Both Aspects
0
−90
−60
−30
0
30
60
Q
−
Angular Displacement
−
°
90
0.6
0.4
0.2
Figure 6
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2007, TAOS Inc.
www.taosinc.com
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