t
t
TSLB257, TSLG257, TSLR257
HIGH SENSITIVITY COLOR
LIGHT TO VOLTAGE CONVERTERS
TAOS027B – MARCH 2002
D
Converts Light Intensity to Output Voltage
D
Integral Color Filter in Blue, Green, or Red
D
Monolithic Silicon IC Containing
D
D
D
D
D
D
Photodiode, Operational Amplifier, and
Feedback Components
High Sensitivity
Single Voltage Supply Operation
Low Noise (200
µVrms
Typ to 1 kHz)
Rail-to-Rail Output
High Power-Supply Rejection (35 dB at
1 kHz)
Compact 3-Leaded Plastic Package
PACKAGE
(FRONT VIEW)
1
2
3
GND V
DD
OUT
Description
The TSLB257, TSLG257, and TSLR257 are high-sensitivity low-noise light-to-voltage optical converters that
incorporate onboard blue, green, and red optical filters, respectively. These devices combine a photodiode and
a transimpedance amplifier on a single monolithic CMOS integrated circuit with a color filter over the photodiode.
Output voltage is directly proportional to light intensity (irradiance) on the photodiode. Each device has a
transimpedance gain of 320 MΩ with improved offset voltage stability and low power consumption, and is
supplied in a 3-lead clear plastic sidelooker package with an integral lens.
These devices are ideal for applications such as colorimetry, printing process control, display color correction,
and selectively ambient light detection or rejection.
Functional Block Diagram
–
+
Voltage
Output
Terminal Functions
TERMINAL
NAME
GND
OUT
V
DD
NO.
1
3
2
Output voltage
Supply voltage
DESCRIPTION
Ground (substrate). All voltages are referenced to GND.
The
LUMENOLOGY
r
Company
t
Copyright
E
2002, TAOS Inc.
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S
Plano, TX 75074
S
(972) 673-0759
t
www.taosinc.com
1
TSLB257, TSLG257, TSLR257
HIGH SENSITIVITY COLOR
LIGHT TO VOLTAGE CONVERTERS
TAOS027B – MARCH 2002
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Output current, I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±10
mA
Duration of short-circuit current at (or below) 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 s
Operating free-air temperature range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to 85°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to 85°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240°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 voltages are with respect to GND.
Recommended Operating Conditions
MIN
Supply voltage, V
DD
Operating free-air temperature, T
A
2.7
0
MAX
5.5
70
UNIT
V
°C
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2002, TAOS Inc.
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TSLB257, TSLG257, TSLR257
HIGH SENSITIVITY COLOR
LIGHT TO VOLTAGE CONVERTERS
TAOS027B – MARCH 2002
Electrical Characteristics at V
DD
= 5 V, T
A
= 25
°
C, R
L
= 10 k
Ω
(unless otherwise noted) (see Notes
2 and 3)
TSLB257
PARAMETER
V
D
V
OM
Dark voltage
Maximum out ut voltage
output
swing
TEST CONDITIONS
E
e
= 0
V
DD
= 4.5 V, No Load
V
DD
= 4.5 V, R
L
= 10 kΩ
E
e
= 1.7
µW/cm
2
,
λ
p
= 470 nm, Note 4
V
O
Output voltage
E
e
= 1.6
µW/cm
2
,
λ
p
= 524 nm, Note 5
E
e
= 1.1
µW/cm
2
,
λ
p
= 635 nm, Note 6
α
VD
Temperature coefficient
of dark voltage (V
D
)
T
A
= 0°C to 70°C
λ
p
= 470 nm,
see Notes 4 and 7
λ
p
= 524 nm,
see Notes 5 and 7
R
e
Irradiance responsivity
λ
p
=565 nm,
see Notes 7 and 8
λ
p
= 635 nm,
see Notes 6 and 7
λ
p
= 470 nm,
see Notes 4 and 7
λ
p
= 524 nm,
see Notes 5 and 7
R
V
Illuminance responsivity
λ
p
= 565 nm,
see Notes 7 and 8
λ
p
= 635 nm,
see Notes 6 and 7
PSRR
I
DD
Power supply rejection
y j
ratio
Supply current
f
ac
= 100 Hz, see Note 10
f
ac
= 1 kHz, see Note 10
V
O
= 2 V (typical)
–15
1.18
0.53
0.09
0.05
1.57
0.10
0.015
0.033
55
35
1.9
3.5
–15
0.35
1.25
1.17
0.14
0.47
0.24
0.20
0.093
55
35
1.9
3.5
4
1.3
MIN
0
4.49
4.2
2
2.7
1.3
2
2.7
1.3
2
–15
0.09
0.14
0.36
1.82
0.12
0.027
V/Ix
0.06
1.21
55
35
1.9
3.5
dB
mA
V/
(µW/
cm
2
)
2.7
µV/°C
V
4
TYP
MAX
15
MIN
0
4.49
4.2
4
TSLG257
TYP
MAX
15
MIN
0
4.49
4.2
V
TSLR257
TYP
MAX
15
UNIT
mV
NOTES: 2. Measured with R
L
= 10 kΩ between output and ground.
3. Optical measurements are made using small-angle incident radiation from a light-emitting diode (LED) optical source.
4. The input irradiance is supplied by an InGaN light-emitting diode with the following characteristics: peak wavelength
λ
p
= 470 nm,
spectral halfwidth
∆λ½
= 35 nm, luminous efficacy = 75 lm/W.
5. The input irradiance is supplied by an InGaN light-emitting diode with the following characteristics: peak wavelength
λ
p
= 524 nm,
spectral halfwidth
∆λ½
= 47 nm, luminous efficacy = 520 lm/W.
6. The input irradiance is supplied by an AlInGaP light-emitting diode with the following characteristics: peak wavelength
λ
p
= 635 nm,
spectral halfwidth
∆λ½
= 17 nm, luminous efficacy = 150 lm/W.
7. Responsivity is characterized over the range V
O
= 0.1 V to 4.5 V. The best-fit straight line of Output Voltage V
O
versus Irradiance
E
e
over this range will typically have a positive extrapolated V
O
value for E
e
= 0.
8. The input irradiance is supplied by a GaP light-emitting diode with the following characteristics: peak wavelength
λ
p
= 565 nm,
spectral halfwidth
∆λ½
= 28 nm, luminous efficacy = 595 lm/W.
9. Illuminance responsivity R
V
is calculated from the irradiance responsivity by using the LED luminous efficacy values stated in Notes
4, 5, 6, and 8, and using 1 lx = 1 lm/m
2
.
10. Power supply rejection ratio PSRR is defined as 20 log (∆V
DD
(f)/∆V
O
(f)) with V
DD
(f = 0) = 5 V and V
O
(f = 0) = 2 V.
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Copyright
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2002, TAOS Inc.
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TSLB257, TSLG257, TSLR257
HIGH SENSITIVITY COLOR
LIGHT TO VOLTAGE CONVERTERS
TAOS027B – MARCH 2002
Switching Characteristics at V
DD
= 5 V, T
A
= 25
°
C, R
L
= 10 kΩ (unless otherwise noted)
PARAMETER
t
r
t
f
t
s
Output pulse rise time, 10% to 90% of final value
Output pulse fall time, 10% to 90% of final value
Output settling time to 1% of final value
Integrated noise voltage
TEST CONDITIONS
See Note 11 and Figure 1
See Note 11 and Figure 1
See Note 11 and Figure 1
f = dc to 1 kHz
f = 10 Hz
V
n
Output noise voltage, rms
g ,
f = 100 Hz
f = 1 kHz
NOTE 11: Switching characteristics apply over the range V
O
= 0.1 V to 4.5 V.
E
e
= 0
E
e
= 0
E
e
= 0
E
e
= 0
MIN
TYP
160
150
330
200
6
6
7
µ √
µV/√Hz
rms
MAX
250
250
UNIT
µs
µs
µs
µVrms
PARAMETER MEASUREMENT INFORMATION
V
DD
Pulse
Generator
LED
(see Note A)
TSLx257
1
TEST CIRCUIT
–
+
R
L
Output
(see Note B)
10%
90%
90%
10%
2
E
e
Input
3
Output
t
r
t
f
VOLTAGE WAVEFORM
NOTES: A. The input irradiance is supplied by a pulsed light-emitting diode with the following characteristics: t
r
< 1
µs,
t
f
< 1
µs.
B. The output waveform is monitored on an oscilloscope with the following characteristics: t
r
< 100 ns, Z
i
≥
1 MΩ, C
i
≤
20 pF.
Figure 1. Switching Times
Copyright
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2002, TAOS Inc.
t
The
LUMENOLOGY
r
Company
t
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TSLB257, TSLG257, TSLR257
HIGH SENSITIVITY COLOR
LIGHT TO VOLTAGE CONVERTERS
TAOS027B – MARCH 2002
TYPICAL CHARACTERISTICS
PHOTODIODE SPECTRAL RESPONSIVITY
1
0.9
0.8
TSLG257
TSLR257
PHOTODIODE SPECTRAL RESPONSIVITY WITH
EXTERNAL HOYA CM500 FILTER
1
TSLG257
Normalized to
TSLR257
@ 670 nm
T
A
= 25°C
Relative Responsivity
0.9
0.8
TSLB257
TSLR257
Normalized to
TSLG257
@ 540 nm
T
A
= 25°C
Relative Responsivity
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
300
TSLB257
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
300
500
700
900
λ
– Wavelength – nm
1100
500
700
900
λ
– Wavelength – nm
1100
Figure 2
Figure 3
DARK VOLTAGE
vs
FREE-AIR TEMPERATURE
10
9
8
V D– Dark Voltage – mV
7
6
5
4
3
2
1
0
0
10
20
30
40
50
60
T
A
– Free-Air Temperature –
°C
70
Normalized Response
V
DD
= 5 V
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–90
–70
NORMALIZED RESPONSE
vs
ANGULAR DISPLACEMENT
–50
–30 –10
10
30
50
Angular Displacement –
5
70
90
Figure 4
Figure 5
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LUMENOLOGY
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Company
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Copyright
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2002, TAOS Inc.
t
www.taosinc.com
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