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OPT101 Datasheet(PDF) 10 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part No. OPT101
Description  MONOLITHIC PHOTODIODE AND SINGLE-SUPPLY TRANSIMPEDANCE AMPLIFIER
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Maker  BURR-BROWN [Burr-Brown (TI)]
Homepage  http://www.burr-brown.com
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®
OPT101
10
LIGHT SOURCE POSITIONING
The OPT101 is tested with a light source that uniformly
illuminates the full area of the integrated circuit, including
the op amp. Although IC amplifiers are light-sensitive to
some degree, the OPT101 op amp circuitry is designed to
minimize this effect. Sensitive junctions are shielded with
metal, and the photodiode area is very large relative to the op
amp input circuitry.
If your light source is focused to a small area, be sure that
it is properly aimed to fall on the photodiode. A narrowly
focused beam falling on only the photodiode will provide
improved settling times compared to a source that uniformly
illuminates the full area of the die. If a narrowly focused
light source were to miss the photodiode area and fall only
on the op amp circuitry, the OPT101 would not perform
properly. The large 0.09" x 0.09" (2.29mm x 2.29mm)
photodiode area allows easy positioning of narrowly focus-
ed light sources. The photodiode area is easily visible, as it
appears very dark compared to the surrounding active
circuitry.
The incident angle of the light source also effects the
apparent sensitivity in uniform irradiance. For small incident
angles, the loss in sensitivity is simply due to the smaller
effective light gathering area of the photodiode (proportional
to the cosine of the angle). At a greater incident angle, light
is diffracted and scattered by the package. These effects are
shown in the typical performance curve “Responsivity vs
Incident Angle.”
DYNAMIC RESPONSE
Using the internal 1M
Ω resistor, the dynamic response of
the photodiode/op amp combination can be modeled as a
simple R • C circuit with a –3dB cutoff frequency of
approximately 14kHz. The R and C values are 1M
Ω and
11pF respectively. By using external resistors, with less than
3pF parasitic capacitance, the frequency response can be
improved. An external 1M
Ω resistor used in the configuration
shown in Figure 4b will create a 23kHz bandwidth with the
same 106V/A dc transimpedance gain. This yields a rise time
of approximately 15
µs (10% to 90%). Dynamic response is
not limited by op amp slew rate. This is demonstrated by the
dynamic response oscilloscope photographs showing virtually
identical large-signal and small-signal response.
Dynamic response will vary with feedback resistor value as
shown in the typical performance curve “Responsivity vs
Frequency.” Rise time (10% to 90%) will vary according to
the –3dB bandwidth produced by a given feedback resistor
value:
where:
tr is the rise time (10% to 90%)
fC is the –3dB bandwidth
LINEARITY PERFORMANCE
The photodiode is operated in the photoconductive mode so
the current output of the photodiode is very linear with
radiant power throughout a wide range. Nonlinearity remains
below approximately 0.05% up to 100
µA photodiode current.
The photodiode can produce output currents of 1mA or
greater with high radiant power, but nonlinearity increases
to several percent in this region.
This very linear performance at high radiant power assumes
that the full photodiode area is uniformly illuminated. If the
light source is focused to a small area of the photodiode,
nonlinearity will occur at lower radiant power.
0.35
f
C
tr =
FIGURE 5. Three-Wire Remote Light Measurement.
1M
OPT101
3pF
0.01 to
0.1µF
21
5
4
λ
83
V
B
8pF
+2.7 to
+36V
NOTE: Pin Numbers for DIP Package.
V
OUT




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