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參數(shù)資料
| 型號(hào)： | OPT210 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Monolithic Photodiode And Amplifier(單片光電二極管和放大器) |
| 中文描述： | 單片光電二極管與放大器（單片光電二極管和放大器） |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 115K |
| 代理商： | OPT210 |
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
μ
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)
(1)
0.5pF
1.8pF
10pF
20pF
BANDWIDTH
10M
1M
100k
10k
1k
70kHz
300kHz
900kHz
1.6MHz
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
λ
R
F
+1
+15V
–15V
100
(0V to 14V)
1
μ
F
1
μ
F
100
C
F
Optional series resistors filter
power supply noise. See text.
(paracitic capacitance)
For R
> 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)
Output voltage
offset by V
A
V
O
λ
R
F
+1
+15V
–15V
1M
10k
±20mV
V
A
0.1
μ
F
300
μ
A
0.1
μ
F
+15V
–15V
100μA
1/2 REF200
200
200
100μA
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
μ
A),
it should be driven by a low impedance such as the buffer-
connected op amp shown.
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| OPT210P | 制造商:BB 制造商全稱:BB 功能描述:MONOLITHIC PHOTODIODE AND AMPLIFIER 300kHz Bandwidth at RF = 1MW |
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| OPT211 | 制造商:BB 制造商全稱:BB 功能描述:MONOLITHIC PHOTODIODE AND AMPLIFIER |
| OPT211P-J | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPT-25W | 制造商:NIHON 功能描述: |
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