r
r
TSL230R−LF, TSL230AR−LF, TSL230BR−LF
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS079A
−
OCTOBER 2006
D
High-Resolution Conversion of Light
D
Intensity to Frequency With No External
Components
Programmable Sensitivity and Full-Scale
Output Frequency
DIP PACKAGE
(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
Single-Supply Operation Down to 2.7 V,
D
D
D
D
D
With Power-Down Feature
Absolute Output Frequency Tolerance of
±5%
(TSL230BR−LF)
Nonlinearity Error Typically 0.2% at 100 kHz
Stable 150 ppm/°C Temperature Coefficient
Replacements for TSL230, TSL230R,
TSL230A, TSL230AR, TSL230B and
TSL230BR
RoHS Compliant
Description
The TSL230R−LF, TSL230AR−LF, and TSL230BR−LF 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−LF),
±
10%
(TSL230AR−LF), or
±20%
(TSL230R−LF). 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
2006, TAOS Inc.
TSL230R−LF, TSL230AR−LF, TSL230BR−LF
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS079A
−
OCTOBER 2006
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
TSL230R−LF
TSL230AR−LF
TSL230BR−LF
T
A
−25°C
to 70°C
−25°C
to 70°C
−25°C
to 70°C
PACKAGE
−
LEADS
PDIP−8
PDIP−8
PDIP−8
PACKAGE DESIGNATOR
P
P
P
ORDERING NUMBER
TSL230RP−LF
TSL230ARP−LF
TSL230BRP−LF
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.
‡
Not recommended for solder reflow.
NOTE 1: All voltage values are with respect to GND.
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
2.7
V
DD
= 4.5 V to 5.5 V
V
DD
= 4.5 V to 5.5 V
2
0
−25
NOM
5
MAX
5.5
V
DD
0.8
70
UNIT
V
V
V
°C
Copyright
E
2006, TAOS Inc.
r
r
The
LUMENOLOGY
r
Company
2
www.taosinc.com
TSL230R−LF, TSL230AR−LF, TSL230BR−LF
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS079A
−
OCTOBER 2006
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
†
TEST CONDITIONS
I
OH
=
−
4 mA
I
OL
= 4 mA
MIN
4
TYP
4.5
0.25
MAX
0.4
5
5
UNIT
V
V
μA
μA
mA
μA
MHz
ppm/°C
%/ V
High-level output voltage
Low-level output voltage
High-level input current
Low-level input current
Supply current
Full-scale frequency
†
Temperature coefficient of output frequency
Supply voltage sensitivity
Power-on mode
Power-down mode
1.1
λ ≤
700 nm
V
DD
= 5 V
±10%
2
5
±
150
±
0.5
3
12
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
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
S0 = H,
S1 = S2 = S3 = L
f
O
Output frequency
S0 = S1 = S2 = H,
S3 = L
S0 = S1 = S3 = H,
S2 = L
S0 = S1 = S2 = S3 = H
E
e
= 0, S0 = S1 = H,
S2 = S3 = L
R
e
t
w
Responsivity
Output pulse
duration
Nonlinearity
‡#
Recovery from
power down
Step response to
full-scale step input
Response time to
programming
change
Response time to
output enable (OE)
‡
#
TSL230R−LF
MIN
80
8
0.8
40
8
0.8
TYP
100
10
1
50
10
1
0.4
0.77
125
1/2f
O
±
0.1%
±
0.2%
±
0.5%
100
600
MAX
120
12
1.2
60
12
1.2
10
TSL230AR−LF
MIN
90
9
0.9
45
9
0.9
TYP
100
10
1
50
10
1
0.4
0.77
125
1/2f
O
±
0.1%
±
0.2%
±
0.5%
100
600
MAX
110
11
1.1
55
11
1.1
10
TSL230BR−LF
MIN
95
9.5
0.95
47.5
9.5
0.95
TYP
100
10
1
50
10
1
0.4
0.77
125
1/2f
O
±
0.1%
±
0.2%
±
0.5%
100
600
MAX
105
10.5
1.05
52.5
10.5
1.05
10
UNIT
kHz
kHz
kHz
kHz
kHz
kHz
Hz
kHz/
(μW/
cm
2
)
ns
s
%F.S.
%F.S.
%F.S.
μs
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
1 pulse of new frequency plus 1
μs
2 periods of new principal frequency plus 1
μs
§
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.
The
LUMENOLOGY
r
Company
r
r
Copyright
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2006, TAOS Inc.
www.taosinc.com
3
TSL230R−LF, TSL230AR−LF, TSL230BR−LF
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS079A
−
OCTOBER 2006
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
100
fO
−
Output Frequency
−
kHz
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 10 0
1k
10 k 100 k 1 M
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
O(dark)
— 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
2006, TAOS Inc.
r
r
The
LUMENOLOGY
r
Company
4
www.taosinc.com
TSL230R−LF, TSL230AR−LF, TSL230BR−LF
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
TAOS079A
−
OCTOBER 2006
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
APPLICATION INFORMATION
Power-supply considerations
Power-supply lines must be decoupled by a 0.01-μF to 0.1-μF capacitor with short leads placed close to the
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.
The
LUMENOLOGY
r
Company
r
r
Copyright
E
2006, TAOS Inc.
www.taosinc.com
5
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