1
OPT210
OPT210
FEATURES
q
BOOTSTRAP ANODE DRIVE:
Extends Bandwidth: 900kHz (R
F
= 100K
)
Reduces Noise
q
LARGE PHOTODIODE: 0.09" x 0.09"
q
HIGH RESPONSIVITY: 0.45A/W
(650nm)
q
EXCELLENT SPECTRAL RESPONSE
q
WIDE SUPPLY RANGE:
2.25 to
18V
q
TRANSPARENT DIP, SIP AND SURFACE-
MOUNT PACKAGES
APPLICATIONS
q
BARCODE SCANNERS
q
MEDICAL INSTRUMENTATION
q
LABORATORY INSTRUMENTATION
q
POSITION AND PROXIMITY DETECTORS
q
PARTICLE DETECTORS
DESCRIPTION
The OPT210 is a photodetector consisting of a high
performance silicon photodiode and precision FET-
input transimpedance amplifier integrated on a single
monolithic chip. Output is an analog voltage propor-
tional to light intensity.
The large 0.09" x 0.09" photodiode is operated at low
bias voltage for low dark current and excellent linear-
ity. A novel photodiode anode bootstrap circuit re-
duces the effects of photodiode capacitance to extend
bandwidth and reduces noise.
The integrated combination of photodiode and
transimpedance amplifier on a single chip eliminates
the problems commonly encountered with discrete
designs such as leakage current errors, noise pick-up
and gain peaking due to stray capacitance.
The OPT210 operates from
2.25 to
18V supplies
and quiescent current is only 2mA. Available in a
transparent 8-pin DIP, 8-lead surface-mount and 5-pin
SIP, it is specified for 0
to 70
C operation.
MONOLITHIC PHOTODIODE AND AMPLIFIER
300kHz Bandwidth at R
F
= 1M
OPT210
(2)
8
1
(3)
2
(1)
3
(4)
5
(5)
V
O
V
V+
(SIP Pins)
R
F
+1
DIP Pins
FPO
SPECTRAL RESPONSIVITY
Voltage Output (V/W)
Wavelength (nm)
100
200
300
400 500
600
700 800
900 1000 1100
0.5
0.4
0.3
0.2
0.1
0
0.5
0.4
0.3
0.2
0.1
0
Photodiode Responsivity (A/W)
Infrared
Blue
Green
Yellow
Red
Ultraviolet
Using External
1M
Resistor
PDS-1313B
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
2
OPT210
OPT210P
OPT210W
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RESPONSIVITY
Photodiode Current
= 650nm
0.45
A/W
Unit-to-Unit Variation
5
%
Voltage Output
= 650nm, External R
F
= 1M
0.45
V/
W
Nonlinearity
0.01
% of FS
Photodiode Area
(0.09 x 0.09in)
0.008
in
2
(2.29 x 2.29mm)
5.2
mm
2
DARK ERROR, RTO
Offset Voltage
2
10
mV
vs Temperature
35
V/
C
vs Power Supply
V
S
=
2.25V to
18V
100
1000
V/V
Voltage Noise
BW = 0.01Hz to 100kHz
160
Vrms
FREQUENCY RESPONSE
Bandwidth
External R
F
= 1M
300
kHz
Rise Time
10% to 90%
1.2
s
Settling Time, 1%
FS to Dark step
3
s
0.1%
8
s
0.01%
20
s
Overload Recovery
100% Overdrive
7
s
OUTPUT
Voltage Output, Positive
R
L
= 10k
(V+)1.25
(V+)0.75
V
Positive
R
L
= 5k
(V+)1
Negative
(1)
R
L
= 10k
0.4
0.5
V
Capacitive Load, Stable Operation
500
pF
Short-Circuit Current
(2)
+50
mA
POWER SUPPLY
Operating Range
2.25
18
V
Quiescent Current
+2.0/1.7
4
mA
TEMPERATURE RANGE
Specification
0
70
C
Operating
0
70
C
Storage
25
85
C
JA
100
C/W
NOTES: (1) Output typically swings to 0.5V below the voltage applied to the non-inverting input terminal, which is normally connected to ground. (2) Positive
current (sourcing) is limited. Negative current (sinking) is not limited.
SPECIFICATIONS
At T
A
= +25
C, V
S
=
15V,
= 650nm, External R
F
= 1M
, R
L
= 10k
, unless otherwise noted.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
PHOTODIODE SPECIFICATIONS
PHOTODIODE
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Photodiode Area
(0.09
x
0.09in)
0.008
in
2
(2.29
x
2.29mm)
5.2
mm
2
Current Responsivity
= 650nm
0.45
A/W
865
A/W/cm
2
Dark Current
V
D
= 1.2V
70
pA
vs Temperature
Doubles every 10
C
Capacitance
V
D
= 1.2V
550
pF
Effective Capacitance
(1)
V
D
= 1.2V
10
pF
NOTES: (1) Effect of photodiode capacitance is reduced by internal buffer bootstrap drive. See text
3
OPT210
OP AMP SPECIFICATIONS
Op amp specifications provided for comparative information only.
OP AMP
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT
Offset Voltage
2
mV
vs Temperature
35
V/
C
vs Power Supply
100
V/V
Input Bias Current
Inverting Input
15
pA
vs Temperature
Doubles every 10
C
Non-inverting Input
300
A
NOISE
Voltage Noise
f = 10Hz
20
nV/
Hz
f = 100Hz
9
nV/
Hz
f = 1kHz
6
nV/
Hz
Current Noise Density, Inverting Input
BW = 0.01Hz to 100kHz
0.8
fA/
Hz
INPUT VOLTAGE RANGE
Common-Mode Input Range
(1)
V
S
2.25
V
Common-Mode Rejection
65
dB
INPUT IMPEDANCE
Inverting Input Impedance
3x10
10
||3
|| pF
Non-Inverting Input Impedance
250
k
OPEN-LOOP GAIN
Open-Loop Voltage Gain
V
O
= 0V to +13.75V
70
dB
FREQUENCY RESPONSE
Bandwidth, Small Signal
35
MHz
Rise Time, Large Signal
10% to 90%
25
ns
Settling Time, 1%
10V step
240
ns
0.1%
390
ns
0.01%
800
ns
Overload Recovery
100% Overdrive
7
s
OUTPUT
Voltage Output, Positive
R
L
= 10k
(V+)1.25
(V+)0.75
V
Positive
R
L
= 5k
(V+)1
Negative
(1)
R
L
= 10k
0.4
0.5
V
Capacitive Load, Stable Operation
500
pF
Short-Circuit Current
(2)
+50
mA
POWER SUPPLY
Operating Voltage
2.25
18
V
Quiescent Current
+1.7/1.4
4
mA
NOTES: (1) Output typically swings to 0.5V below the voltage applied to the non-inverting input terminal, which is normally connected to ground. (2) Positive
current (sourcing) is limited. Negative current (sinking) is not limited.
BUFFER
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT
Offset Voltage
(1)
1.2
V
Input Bias Current
15
pA
vs Temperature
Doubles every 10
C
Input Impedance
10
11
||3
|| pF
FREQUENCY RESPONSE
Bandwidth, Small Signal
500
MHz
OUTPUT
Current
200
A
Voltage Gain
0.99
V/V
POWER SUPPLY
Operating Range
2.25
18
V
Quiescent Current
0.3
mA
NOTE: (1) Intentional voltage offset to reverse bias photodiode.
BUFFER SPECIFICATIONS
Buffer specifications provided for comparative information only.
4
OPT210
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
MOISTURE SENSITIVITY
AND SOLDERING
Clear plastic does not contain the structural-enhancing fillers
used in black plastic molding compound. As a result, clear
plastic is more sensitive to environmental stress than black
plastic. This can cause difficulties if devices have been stored
in high humidity prior to soldering. The rapid heating during
soldering can stress wire bonds and cause failures. Prior to
soldering, it is recommended that plastic devices be baked-out
at 85
C for 24 hours.
The fire-retardant fillers used in black plastic are not compat-
ible with clear molding compound. The OPT210 plastic
packages cannot meet flammability test, UL-94.
Top View
DIP
Top View
SIP
PIN CONFIGURATIONS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ...................................................................................
18V
Input Voltage Range (Common Pin) ....................................................
V
S
Output Short-Circuit (to ground) ............................................... Continuous
Operating Temperature: P, W ........................................... 25
C to +85
C
Storage Temperature: P, W ........................................... 25
C to +85
C
Junction Temperature: P, W .......................................................... +85
C
Lead Temperature (soldering, 10s) ................................................ +300
C
(Vapor-Phase Soldering Not Recommended on Plastic Packages)
PACKAGE DRAWING
PRODUCT
PACKAGE
NUMBER
(1)
OPT210P
8-Pin Plastic DIP
006-5
OPT210P-J
8-Lead Surface Mount
(2)
006-6
OPT210W
5-Pin Plastic SIP
321-1
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book. (2) 8-pin DIP with leads
formed for surface mounting.
PACKAGE INFORMATION
V+
In
V
NC
Common
NC
NC
Output
1
2
3
4
8
7
6
5
(1)
NOTE: (1) Photodiode location.
Common
V+
In
V
Output
1
2
3
4
5
(1)
NOTE: (1) Photodiode location.
5
OPT210
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, V
S
=
15V,
= 650nm, unless otherwise noted.
RESPONSE vs INCIDENT ANGLE
Relative Response
Incident Angle ()
0
1.0
0.8
0.6
0.4
0.2
0
20
40
60
80
Y
X
1.0
0.8
0.6
0.4
0.2
0
Y
X
Y
X
SIP Package
Plastic
DIP Package
VOLTAGE RESPONSIVITY vs RADIANT POWER
Radiant Power (W)
Output Voltage (V)
0.01
0.1
10
100
1k
1
10
1
0.1
0.01
0.001
R
F
= 1M
R
F
= 100k
R
F
= 10k
R
F
= 1k
R
F
= 10M
= 650nm
VOLTAGE RESPONSIVITY vs IRRADIANCE
Irradiance (W/m
2
)
Output Voltage (V)
0.001
0.01
1
10
100
0.1
10
1
0.1
0.01
0.001
R
F
= 1M
R
F
= 100k
R
F
= 10k
R
F
= 1k
R
F
= 10M
= 650nm
VOLTAGE OUTPUT RESPONSIVITY vs FREQUENCY
Responsivity (V/
W)
Frequency (Hz)
1k
10k
100k
1M
10M
100
10
1
0.1
0.01
R
F
= 100M
R
F
= 10M
R
F
= 1M
,
C
F
= 0.5pF
R
F
= 100k
,
C
F
= 1.8pF
POWER SUPPLY REJECTION
vs FREQUENCY
Power Supply Rejection (dB)
Frequency (Hz)
1
10
100
1k
10k
100k
1M
10M
90
80
70
60
50
40
30
20
10
0
10
V
V+
NORMALIZED SPECTRAL RESPONSIVITY
Normalized Current or Voltage Output
Wavelength (nm)
100
200
300
400 500
600
700 800
900 1000 1100
1.0
0.8
0.6
0.4
0.2
0
650nm
(0.45A/W)
(0.48A/W)
6
OPT210
LARGE-SIGNAL RESPONSE, R
F
= 1M
2V/div
5s/div
SMALL-SIGNAL RESPONSE, R
F
= 1M
Measurement BW = 1MHz
5
s/div
20mV/div
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, V
S
=
15V,
= 650nm, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
Quiescent Current (mA)
Temperature (C)
75
3
2
1
0
50
25
0
25
50
75
100
125
V
S
= 15V
V
S
= 2.25V
I
Q
I
Q
+
I
Q
I
Q
+
NOISE EFFECTIVE POWER
vs MEASUREMENT BANDWIDTH
Frequency (Hz)
Noise Effective Power (W)
10
100
10k
100k
1M
1k
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10M
R
F
= 10k
R
F
= 100M
R
F
= 10M
R
F
= 1M
R
F
= 100k
Dashed lines indicate
noise measured beyond
the signal bandwidth.
= 650nm
OUTPUT NOISE VOLTAGE
vs MEASUREMENT BANDWIDTH
Frequency (Hz)
Noise Voltage (Vrms)
10
100
10k
100k
1M
1k
10
2
10
3
10
4
10
5
10
6
10
7
10M
Dashed lines indicate
noise measured beyond
the signal bandwidth.
R
F
= 100k
R
F
= 10k
R
F
= 1M
R
F
= 100M
R
F
= 10M
7
OPT210
The typical performance curve "Output Voltage vs Radiant
Power" shows the response throughout a wide range of
radiant power and feedback resistor values. The response
curve "Output Voltage vs Irradiance" is based on the
photodiode area of 5.23x10
6
m
2
.
BOOTSTRAP BUFFER
The photodiode's anode is driven by an internal high speed
voltage buffer shown in Figure 1. This variation on the
classical transimpedance amplifier circuit reduces the effects
of photodiode capacitance. The effective photodiode
capacitance is reduced from approximately 550pF to 10pF
with this bootstrap drive technique. This improves bandwidth
and reduces noise.
The output voltage of the buffer is offset approximately
1.2V below the input. This reverse biases the photodiode for
reduced capacitance.
OP AMP
A special op amp design is used to achieve wide bandwidth.
The op amp output voltage cannot swing lower than 0.5V
below the non-inverting input voltage. Since photodiode
current always produces a positive output voltage, this does
not limit the required output swing.
The inverting input is designed for very low input bias
current--approximately 15pA. The non-inverting input has
much larger bias current--approximately 300
A flows out
of this terminal.
APPLICATIONS INFORMATION
Basic operation of the OPT210 is shown in Figure 1. Power
supply bypass capacitors should be connected near the
device pins as shown. Noise performance of the OPT210 can
be degraded by the high frequency noise on the power
supplies. Resistors in series with the power supply pins as
shown can be used (optional) to help filter power supply
noise
An external feedback resistor, R
F
, is connected from In to
the V
O
terminal as shown in Figure 1. Feedback resistors of
1M
or less require parallel capacitor, C
F
. See the table of
values in Figure 1.
R
F
C
F
(min)
BANDWIDTH
10M
(1)
70kHz
1M
0.5pF
300kHz
100k
1.8pF
900kHz
10k
10pF
1.6MHz
1k
20pF
1.6MHz
NOTE: (1) Two series-connected resis-
tors of R
F
/2 for low capacitance. See text.
FIGURE 1. Basic Operation.
OPT210
(2)
8
1
(3)
2
+
(1)
3
+
(4)
5
(5)
V
O
R
F
+1
+15V
15V
100
(0V to 14V)
1
F
1
F
100
C
F
Optional series resistors filter
power supply noise. See text.
(paracitic capacitance)
For R
F
> 2M
,
use series-connected
resistors. See text.
Bandwidth varies with feedback resistor value. To achieve
widest bandwidth with resistors greater than 1M
, use care
to minimize parasitic parallel capacitance. For widest
bandwidth with resistors greater than 2M
, connect two
resistors (R
F
/2) in series. Airwiring this interconnection
provides lowest capacitance. Although the OPT210 is usable
with feedback resistors of 100M
and higher, with
R
F
10M
the model OPT211 will provide lower dc errors
and reduced noise.
The OPT210's output voltage is the product of the photodiode
current times the external feedback resistor, R
F
. Photodiode
current, I
D
, is proportional to the radiant power or flux (in
watts) falling on the photodiode. At a wavelength of 650nm
(visible red) the photodiode Responsivity, R
I
, is approximately
0.45A/W. Responsivity at other wavelengths is shown in the
typical performance curve "Responsivity vs Wavelength."
OPT210
(2)
8
1
(3)
2
(1)
3
(4)
5
(5)
V
O
R
F
+1
+15V
15V
1M
10k
20mV
V
A
Output voltage
offset by V
A
0.1
F
300
A
0.1
F
+15V
15V
100A
1/2 REF200
200
200
100A
1/2 REF200
OPA131
FIGURE 2. Adjustable Output Offset.
An offset voltage can be connected to the non-inverting
input as shown in Figure 2. A voltage applied to the non-
inverting input is summed at the output. Because the non-
inverting input bias current is high (approximately 300
A),
it should be driven by a low impedance such as the buffer-
connected op amp shown.
8
OPT210
cosine of the incident angle). At a greater incident angle,
light is diffused by the side of the package. These effects are
shown in the typical performance curve, "Response vs
Incident Angle."
LINEARITY PERFORMANCE
Photodiode current is very linear with radiant power
throughout its range. Nonlinearity remains below
approximately 0.01% up to 200
A. The anode buffer drive,
however, is limited to approximately 200
A. This produces
an abrupt limit to photodiode output current when radiant
power reaches approximately 450
W.
Best linearity is achieved with the photodiode uniformly
illuminated. A light source focused to a very small beam,
illuminating only a small percentage of the photodiode area,
may produce a higher nonlinearity.
NOISE PERFORMANCE
Noise performance of the OPT210 is determined by the op
amp characteristics in conjunction with the feedback
components, photodiode capacitance, and buffer performance.
The typical performance curve "Output Noise Voltage vs
Measurement Bandwidth" shows how the noise varies with
R
F
and measured bandwidth (0.1Hz to the indicated
frequency). The signal bandwidth of the OPT210 is indicated
on the curves. Noise can be reduced by filtering the output
with a cutoff frequency equal to the signal bandwidth.
Output noise increases in proportion to the square-root of the
feedback resistance, while responsivity increases linearly
with feedback resistance. So best signal-to-noise ratio is
achieved with large feedback resistance. This comes with
the trade-off of decreased bandwidth.
The noise performance of a photodetector is sometimes
characterized by Noise Effective Power (NEP). This is the
radiant power which would produce an output signal equal
to the noise level. NEP has the units of radiant power
(watts), or Watts/
Hz to convey spectral information about
the noise. The typical performance curve "Output Noise
Voltage vs Measurement Bandwidth" is also scaled for NEP
on the right-hand side.
The OPT210 can be connected to operate from a single
power supply as shown in Figure 3. The non-inverting input
bias current flows through a zener diode to provide a bias
voltage. The output voltage is referenced to this bias point.
FIGURE 3. Single Power Supply Operation.
OPT210
(2)
8
1
+
(3)
2
1
F
(1)
3
(4)
5
(5)
(5.6V)
V
O
V
O
measured
relative to 5.6V
zener voltage.
ZD
1
ZD
1
: IN4626 5.6V
specified at I
Z
= 250
A
300
A
R
F
+1
+15V
0.1
F
DARK ERRORS
The dark errors in the specification table include all sources
with R
F
= 1M
. The dominant error source is the input
offset voltage of the op amp. Photodiode dark current is
approximately 70pA and the combined input bias current of
the op amp and buffer is approximately 30pA. Photodiode
dark current and input bias current total approximately
100pA at 25
C and double for each 10
C above 25
C. At
70
C, the total error current is approximately 2nA. With
R
F
= 1M
, this would produce a 2mV offset voltage in
addition to the initial amplifier offset voltage (10mV max)
at 25
C. The dark output voltage can be trimmed to zero
with the optional circuit shown in Figure 2.
LIGHT SOURCE POSITIONING
The OPT210 is tested with a light source that uniformly
illuminates the full integrated circuit area, including the op
amp. Although all IC amplifiers are light sensitive to some
degree, the OPT210 op amp circuitry is designed to minimize
this effect. Sensitive junctions are shielded with metal where
possible. Furthermore, the photodiode area is very large
compared to the op amp circuitry making these effects
negligible.
If your light source is focused to a small area, be sure that
it is properly aimed to fall on the photodiode. If a narrowly
focused light source were to miss the photodiode and fall on
the op amp circuitry, the OPT210 would not perform properly.
The large photodiode area is clearly visible as a very dark
area slightly offset from the center of the IC.
The incident angle of the light source also affects the
apparent sensitivity in uniform irradiance. For small incident
angles, the loss in sensitivity is due to the smaller effective
light gathering area of the photodiode (proportional to the
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