t
t
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 – NOVEMBER 2002
D
Converts Reflected Light Intensity to
D
D
Output Voltage
Integral Color LEDs and Matching Color
Filters on Sensors
Sensor is a Monolithic Silicon IC
Containing a Photodiode, Operational
Amplifier, Feedback Components, and
Color Filter
High-Output LEDs and High-Sensitivity
Sensors
PACKAGE
(TOP VIEW)
ANODE 1
4 OUT
GND 2
3 V
DD
D
D
Single Voltage Supply Operation
D
Surface-Mount Package
Description
The TRS1722, TRS1755, and TRS1766 are high-sensitivity reflective color sensors in red (630 nm), green
(567 nm), and blue (470 nm) — respectively — with light-to-voltage converters. Each device consists of a
colored LED light source, a photodiode light sensor with matching optical color filter, a transimpedance amplifier,
and on-board signal conditioning. Output voltage is directly proportional to the reflected light intensity on the
photodiode plus any ambient light (which may be considered noise).
Functional Block Diagram
LED
Anode
The
LUMENOLOGY
r
Company
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S
Plano, TX 75074
S
(972) 673-0759
t
www.taosinc.com
1
ÇÇÇÇ
ÇÇÇÇ
–
+
Voltage
Output
Copyright
E
2002, TAOS Inc.
External
Reflecting
Surface
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 – NOVEMBER 2002
Terminal Functions
TERMINAL
NAME
GND
ANODE
OUT
V
DD
NO.
2
1
4
3
LED anode drive input
Output voltage
Supply voltage
DESCRIPTION
Ground. LED cathode and sensor ground. All voltages are referenced to GND.
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
LED DC forward current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
LED peak forward current (5% duty cycle @ 1 kHz or more) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
LED junction temperature, LED T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C
Operating free-air temperature range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to 85°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to 85°C
Lead temperature in solder contact zone 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
LED forward current
Operating free-air temperature, T
A
3
0
0
MAX
5.5
10
70
UNIT
V
mA
°C
LED
TRS1722
PARAMETER
V
f
I
r
P
o
λ
BW
Forward voltage
Reverse leakage
Radiant flux
Wavelength
Bandwidth
TEST CONDITIONS
I
f
= 20 mA
V
r
= 5 V
I
f
= 5 mA
I
f
= 5 mA
I
f
= 5 mA
14
630
40
MIN
TYP
2.2
MAX
3
10
5
567
26
MIN
TRS1755
TYP
2.3
MAX
3
10
300
468
26
MIN
TRS1766
TYP
2.7
MAX
4
10
UNIT
V
µA
µW
nm
nm
Copyright
E
2002, TAOS Inc.
t
The
LUMENOLOGY
r
Company
t
2
www.taosinc.com
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 – NOVEMBER 2002
Electrical Characteristics at V
DD
= 5 V, T
A
= 25
°
C, R
L
= 10 k
Ω
(unless otherwise noted) (continued)
Detector (see Notes 2 and 3)
TRS1722
PARAMETER
V
D
V
OM
α
VD
Dark voltage
Maximum out ut voltage
output
swing
Temperature coefficient
of dark voltage (V
D
)
TEST CONDITIONS
E
e
= 0
No Load
R
L
= 10 kΩ
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)
4
MIN
0
4.49
4.2
–15
20
35
90
460
0.12
0.027
0.06
1.21
55
35
1.9
3.5
4
TYP
MAX
20
MIN
0
4.49
4.2
–15
90
300
300
35
0.47
0.24
0.20
0.093
55
35
1.9
3.5
4
TRS1755
TYP
MAX
20
MIN
0
4.49
4.2
–15
300
130
22
13
1.57
0.10
V/Ix
0.015
0.033
55
35
1.9
3.5
dB
mA
mV/
(µW/
cm
2
)
V
µV/°C
TRS1766
TYP
MAX
20
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.
The
LUMENOLOGY
r
Company
t
Copyright
E
2002, TAOS Inc.
t
www.taosinc.com
3
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 – NOVEMBER 2002
Electrical Characteristics at V
DD
= 5 V, T
A
= 25
°
C, R
L
= 10 k
Ω
(unless otherwise noted) (continued)
Coupled (see Note 2)
TRS1722
PARAMETER
I
F
LED forward current
TEST CONDITIONS
V
O
= 2 V,
d = 1 mm (Note 11)
I
f
= 2.5 mA,
d = 1 mm (Note 11)
V
O
Output voltage
I
f
= 5 mA,
d = 1 mm (Note 11)
I
f
= 0.25 mA,
d = 1 mm (Note 11)
I
f
= 5 mA, no surface
(see Note 12)
V
ox
Crosstalk
I
f
= 1 mA, no surface
(see Note 12)
0
80
300
0
30
200
mV
0
130
500
MIN
0.5
TYP
2.1
2.4
2
1.3
V
MAX
4
MIN
2
TRS1755
TYP
5
MAX
8
MIN
0.1
TRS1766
TYP
0.4
MAX
1.75
UNIT
mA
NOTES: 11. Measured using Eastman Kodak neutral white test card having 90% diffuse reflectance located a distance from the front surface
of the reflective sensors. Reference: Eastman Kodak catalog number #1257795.
12. Crosstalk is the output voltage measured with the indicated current on the LED and with no reflecting surface. Ambient light is
excluded with a black box approximately 20 cm in each dimension.
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 13 and Figure 1
See Note 13 and Figure 1
See Note 13 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 13: 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
Copyright
E
2002, TAOS Inc.
t
The
LUMENOLOGY
r
Company
t
4
www.taosinc.com
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 – NOVEMBER 2002
PARAMETER MEASUREMENT INFORMATION
White Test Card
1
Pulse
Generator
2
NOTES: A. The input irradiance is supplied by pulsing the LED with a white test card positioned 1 mm from the face of the device.
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.
C. The pulse generator output drive is adjusted until the sensor output voltage reaches 2 volts.
DETECTOR SPECTRAL RESPONSIVITY
1
0.9
0.8
Relative Responsivity
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
300
TRS1766
TRS1722
V D– Dark Voltage – mV
TRS1755
500
The
LUMENOLOGY
r
Company
ÇÇÇÇ
1 mm
–
+
R
L
3
V
DD
TEST CIRCUIT
4
Output
Normalized to
TRS1722
@ 670 nm
T
A
= 25°C
10
9
8
7
6
5
4
3
2
1
0
700
900
λ
– Wavelength – nm
1100
0
LED
Input
t
r
90%
Output
(see Note B)
10%
90%
10%
t
f
VOLTAGE WAVEFORM
Figure 1. Switching Times
TYPICAL CHARACTERISTICS
DARK VOLTAGE
vs
FREE-AIR TEMPERATURE
V
DD
= 5 V
10
20
30
40
50
60
70
T
A
– Free-Air Temperature –
°C
Figure 2
Figure 3
t
Copyright
E
2002, TAOS Inc.
t
www.taosinc.com
5
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