TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 NOVEMBER 2002
1
The
LUMENOLOGY
r
Company
t
t
Copyright
E
2002, TAOS Inc.
www.taosinc.com
D
Converts Reflected Light Intensity to
Output Voltage
D
Integral Color LEDs and Matching Color
Filters on Sensors
D
Sensor is a Monolithic Silicon IC
Containing a Photodiode, Operational
Amplifier, Feedback Components, and
Color Filter
D
High-Output LEDs and High-Sensitivity
Sensors
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
Voltage
Output
+
LED
Anode
External
Reflecting
Surface
t
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S
Plano, TX 75074
S
(972) 673-0759
PACKAGE
(TOP VIEW)
ANODE 1
GND 2
4 OUT
3 V
DD
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 NOVEMBER 2002
2
t
t
Copyright
E
2002, TAOS Inc.
The
LUMENOLOGY
r
Company
www.taosinc.com
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
DESCRIPTION
GND
2
Ground. LED cathode and sensor ground. All voltages are referenced to GND.
ANODE
1
LED anode drive input
OUT
4
Output voltage
V
DD
3
Supply voltage
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
MAX
UNIT
Supply voltage, V
DD
3
5.5
V
LED forward current
0
10
mA
Operating free-air temperature, T
A
0
70
C
LED
PARAMETER
TEST CONDITIONS
TRS1722
TRS1755
TRS1766
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
V
f
Forward voltage
I
f
= 20 mA
2.2
3
2.3
3
2.7
4
V
I
r
Reverse leakage
V
r
= 5 V
10
10
10
A
P
o
Radiant flux
I
f
= 5 mA
14
5
300
W
Wavelength
I
f
= 5 mA
630
567
468
nm
BW
Bandwidth
I
f
= 5 mA
40
26
26
nm
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 NOVEMBER 2002
3
The
LUMENOLOGY
r
Company
t
t
Copyright
E
2002, TAOS Inc.
www.taosinc.com
Electrical Characteristics at V
DD
= 5 V, T
A
= 25
C, R
L
= 10 k
(unless otherwise noted) (continued)
Detector (see Notes 2 and 3)
PARAMETER
TEST CONDITIONS
TRS1722
TRS1755
TRS1766
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
V
D
Dark voltage
E
e
= 0
0
20
0
20
0
20
mV
V
Maximum output voltage
No Load
4.49
4.49
4.49
V
V
OM
Maximum out ut voltage
swing
R
L
= 10 k
4
4.2
4
4.2
4
4.2
V
VD
Temperature coefficient
of dark voltage (V
D
)
T
A
= 0
C to 70
C
15
15
15
V/
C
p
= 470 nm,
see Notes 4 and 7
20
90
300
R
Irradiance responsivity
p
= 524 nm,
see Notes 5 and 7
35
300
130
mV/
(
W/
R
e
Irradiance responsivity
p
=565 nm,
see Notes 7 and 8
90
300
22
(
W/
cm
2
)
p
= 635 nm,
see Notes 6 and 7
460
35
13
p
= 470 nm,
see Notes 4 and 7
0.12
0.47
1.57
R
Illuminance responsivity
p
= 524 nm,
see Notes 5 and 7
0.027
0.24
0.10
V/Ix
R
V
Illuminance responsivity
p
= 565 nm,
see Notes 7 and 8
0.06
0.20
0.015
V/Ix
p
= 635 nm,
see Notes 6 and 7
1.21
0.093
0.033
PSRR
Power supply rejection
f
ac
= 100 Hz, see Note 10
55
55
55
dB
y
j
ratio
f
ac
= 1 kHz, see Note 10
35
35
35
dB
I
DD
Supply current
V
O
= 2 V (typical)
1.9
3.5
1.9
3.5
1.9
3.5
mA
NOTES: 2. Measured with R
L
= 10 k
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
p
= 470 nm,
spectral halfwidth
= 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
p
= 524 nm,
spectral halfwidth
= 47 nm, luminous efficacy = 520 lm/W.
6. The input irradiance is supplied by an Al
I
nGaP light-emitting diode with the following characteristics: peak wavelength
p
= 635 nm,
spectral halfwidth
= 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
p
= 565 nm,
spectral halfwidth
= 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.
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 NOVEMBER 2002
4
t
t
Copyright
E
2002, TAOS Inc.
The
LUMENOLOGY
r
Company
www.taosinc.com
Electrical Characteristics at V
DD
= 5 V, T
A
= 25
C, R
L
= 10 k
(unless otherwise noted) (continued)
Coupled (see Note 2)
PARAMETER
TEST CONDITIONS
TRS1722
TRS1755
TRS1766
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
I
F
LED forward current
V
O
= 2 V,
d = 1 mm (Note 11)
0.5
2.1
4
2
5
8
0.1
0.4
1.75
mA
I
f
= 2.5 mA,
d = 1 mm (Note 11)
2.4
V
O
Output voltage
I
f
= 5 mA,
d = 1 mm (Note 11)
2
V
I
f
= 0.25 mA,
d = 1 mm (Note 11)
1.3
V
Crosstalk
I
f
= 5 mA, no surface
(see Note 12)
0
80
300
0
30
200
mV
V
ox
Crosstalk
I
f
= 1 mA, no surface
(see Note 12)
0
130
500
mV
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 k
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
t
r
Output pulse rise time, 10% to 90% of final value
See Note 13 and Figure 1
160
250
s
t
f
Output pulse fall time, 10% to 90% of final value
See Note 13 and Figure 1
150
250
s
t
s
Output settling time to 1% of final value
See Note 13 and Figure 1
330
s
Integrated noise voltage
f = dc to 1 kHz
E
e
= 0
200
Vrms
f = 10 Hz
E
e
= 0
6
V
n
Output noise voltage, rms
f = 100 Hz
E
e
= 0
6
V/
Hz rms
n
g ,
f = 1 kHz
E
e
= 0
7
NOTE 13: Switching characteristics apply over the range V
O
= 0.1 V to 4.5 V.
TRS1722, TRS1755, TRS1766
HIGH SENSITIVITY REFLECTIVE COLOR SENSOR
WITH LIGHT TO VOLTAGE CONVERTERS
TAOS034 NOVEMBER 2002
5
The
LUMENOLOGY
r
Company
t
t
Copyright
E
2002, TAOS Inc.
www.taosinc.com
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
TEST CIRCUIT
Input
LED
10%
90%
Output
(see Note B)
t
r
R
L
V
DD
3
Output
Pulse
Generator
t
f
90%
10%
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 M
, C
i
20 pF.
C. The pulse generator output drive is adjusted until the sensor output voltage reaches 2 volts.
+
White Test Card
1
2
4
1 mm
Figure 1. Switching Times
TYPICAL CHARACTERISTICS
Figure 2
300
500
700
900
Relative Responsivity
1100
Wavelength nm
T
A
= 25
C
DETECTOR SPECTRAL RESPONSIVITY
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
TRS1755
TRS1766
Normalized to
TRS1722
@ 670 nm
TRS1722
Figure 3
4
2
1
0
70
0
10
DARK VOLTAGE
vs
FREE-AIR TEMPERATURE
10
30
50
Dark V
oltage
mV
V
D
3
T
A
Free-Air Temperature
C
60
20
40
9
7
6
5
8
V
DD
= 5 V
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