TAOS TSL230B, TSL230, TSL230A Datasheet
TSL230, TSL230A, TSL230B
PROGRAMMABLE LIGHTTOFREQUENCY CONVERTERS
TAOS004 – MAY 1999
High-Resolution Conversion of Light
(TOP VIEW)
Intensity to Frequency With No External
Components
Programmable Sensitivity and Full-Scale
Output Frequency
Communicates Directly With a Microcontroller
GND
S0
S1
OE
8
S3
2
7
S2
3
6
OUT
4
5
V
DD
Single-Supply Operation Down to 2.7 V,
With Power-Down Feature
Absolute Output Frequency Tolerance of
±5% (TSL230B)
Nonlinearity Error Typically 0.2% at 100 kHz
Stable 100 ppm/°C Temperature Coefficient
Description
The TSL230, TSL230A, and TSL230B 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%
(TSL230B), ±10% (TSL230A), or ±20% (TSL230). Each circuit has been temperature compensated for the
ultraviolet-to-visible-light range of 300 nm to 700 nm and are characterized for operation over the temperature
range of –25°C to 70°C.
Terminal Functions Selectable Options
TERMINAL
NAME NO.
GND 4 Ground
OE 3 I Enable for fO (active low)
OUT 6 O Scaled-frequency (fO) output
S0, S1 1, 2 I Sensitivity-select inputs
S2, S3 7, 8 I fO scaling-select inputs
V
DD
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I/O DESCRIPTION
5 Supply voltage
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205 Plano, TX 75074 (972) 673-0759
f
S1 S0 SENSITIVITY
L
H
L
H
Power Down
1×
10×
100×
L
L
H
H
S3 S2
L
L
L
H
H
L
H
H
Copyright 2001, TAOS Inc.
O
SCALING
(divide-by)
1
2
10
100
1
TSL230, TSL230A, TSL230B
PROGRAMMABLE LIGHTTOFREQUENCY CONVERTERS
TAOS004 – MAY 1999
Functional Block Diagram
Output
Light
Photodiode
S0 S1 S2 S3
Current-to-Frequency
Converter
OE
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VDD (see Note 1) 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, all inputs, VI –0.3 V to VDD + 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA –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
High-level input voltage, V
Low-level input voltage, V
Operating free-air temperature range, T
DD
IH
IL
VDD = 4.5 V to 5.5 V 2 V
VDD = 4.5 V to 5.5 V 0 0.8 V
A
2.7 5 6 V
DD
–25 70 °C
V
†
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2
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TSL230, TSL230A, TSL230B
Out ut ulse
Nonlinearity
PROGRAMMABLE LIGHTTOFREQUENCY CONVERTERS
TAOS004 – MAY 1999
Electrical Characteristics at TA = 25°C, VDD = 5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
OH
V
OL
I
IH
I
IL
I
DD
k
SVS
Operating Characteristics at VDD = 5 V, TA = 25°C
fOOutput frequency
t
w
†
Full-scale frequency is the maximum operating frequency of the device without saturation.
‡
Nonlinearity is defined as the deviation of fO from a straight line between zero and full scale, expressed as a percent of full scale.
§
Principal frequency is the internal oscillator frequency, equivalent to divide-by-1 output selection.
High-level output voltage IOH = –4 mA 4 4.3 V
Low-level output voltage IOL = 4 mA 0.17 0.26 V
High-level input current 1 µA
Low-level input current 1 µA
Supply current
Full-scale frequency
†
Power-on mode 2 3 mA
Power-down mode 10 µA
1.1 MHz
Temperature coefficient of output frequency λ ≤ 700 nm, –25°C ≤ TA ≤ 70°C ±100 ppm/°C
Supply voltage sensitivity VDD = 5 V ±10% 0.5 %/V
PARAMETER TEST CONDITIONS
TSL230 TSL230A TSL230B
MIN TYP MAX MIN TYP MAX MIN TYP MAX
S0 = H,
S1 = S2 = S3 = L,
Ee = 130 mW/cm2,
0.8 1 1.2 0.9 1 1.1 0.95 1 1.05 MHz
λp = 670 nm
Ee = 0, S0 = H,
S1 = S2 = S3 = L
0.1 10 0.1 10 0.1 10 Hz
S1 = H,
S0 = S2 = S3 = L,
Ee = 13 mW/cm2,
0.8 1 1.2 0.9 1 1.1 0.95 1 1.05 MHz
λp = 670 nm
Ee = 0 S1 = H,
S0 = S2 = S3 = L
0.13 10 0.13 10 0.13 10 Hz
S0 = S1 = H,
S2 = S3 = L,
Ee = 1.3 mW/cm2,
0.8 1 1.2 0.9 1 1.1 0.95 1 1.05 MHz
λp = 670 nm
Output pulse
duration
Nonlinearity
‡
Recovery from
power down
Step response to
full-scale step input
Response time to
programming
Ee = 0, S0 = S1 = H,
S2 = S3 = L
S2 = S3 = L 125 550 125 550 125 550 ns
S2 or S3 = H 1/2f
f
= 0 MHz to 10 kHz ±0.1% ±0.1% ±0.1% %F.S.
O
f
= 0 MHz to 100 kHz ±0.2% ±0.2% ±0.2% %F.S.
O
f
= 0 MHz to 1 MHz ±0.5% ±0.5% ±0.5% %F.S.
O
0.5 10 0.5 10 0.5 10 Hz
O
1/2f
O
1/2f
O
100 100 100 µs
1 pulse of new frequency plus 1 µs
2 periods of new principal frequency plus 1 µs
§
change
Response time to
output enable (OE)
50 150 50 150 50 150 ns
UNIT
s
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Copyright 2001, TAOS Inc.
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