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參數(shù)資料
| 型號(hào)： | OPT211 |
| 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(yè)數(shù)： | 8/9頁(yè) |
| 文件大?。?/td> | 116K |
| 代理商： | OPT211 |
OPT211
8
R
F
(
)
C
F
(pF)
Bandwidth
(kHz)
330k
1M
10M
100M
Not Recommended
1
(1)
<0.2
(1)
<0.2
(1)
150
42
13
NOTE: (1) Most resistors have approximately 1pF stray
capacitance. C
F
<1pF requires series-connected feedback
resistors. See text.
FIGURE 3. Increasing Bandwidth with Bootstrap Buffer.
Gate or base current of the buffer transistor flows through
the feedback resistor, increasing the dark offset voltage. If
dark errors are important, use a FET transistor with picoamp
gate current. A P-channel FET is used to assure that the
anode is at ground potential or slightly negative.
If dark errors are not critical, an NPN Darlington transistor
can be used for a buffer as shown in Figure 3b. A FET-input
op amp connected as a buffer can be used as shown in Figure
3c, but its noise may degrade circuit performance slightly.
Bandwidth of the buffer should be 4MHz, minimum.
FIGURE 4. Rejecting Ambient Light.
This circuit also corrects output offset produced by input
bias current of a buffer used to extend bandwidth. A
Darlington transistor can be used for a bandwidth-enhancing
bootstrap buffer in this circuit without creating offset error.
NOISE PERFORMANCE
Noise performance of the OPT211 is shown in typical
curves for various feedback resistor values. This curve
specifies the total noise measured from 0.1Hz to the indi-
cated bandwidth. High frequency noise is reduced with the
bootstrap transistor buffer circuits shown in Figure 1. This
effect is shown on the typical curve.
Output noise of the OPT211 extends beyond the signal
bandwidth, especially for high feedback resistor values.
Signal-to-noise ratio can be improved by filtering the
OPT211’s output to a bandwidth equal to the signal band-
width—see Figure 5.
AC COUPLING
Some applications are concerned only with sensing variation
in light intensity. Simple capacitive coupling at the OPT211’s
output may be adequate. With large feedback resistors or
bright ambient light, however, the OPT211’s output may
saturate. The circuit in Figure 4 can reject very bright
ambient light, yet provide high AC gain for best signal-to-
noise ratio. The output voltage is integrated and fed back to
the inverting input through R
3
. This drives the average (dc)
voltage at the output to zero. Application Bulletin AB-061
provides more details on this technique.
OPA177
C
0.1μF
C
0.1μF
R
2
1M
R
3
1M
R
1
1M
f
–3dB
=
=16Hz
R
F
R
3
(2
π
R
2
C
2
)
2
3
6
OPT211
7
8
3
1
5
V
OUT
2
V–
V+
λ
R
F
= 10M
C
1
= C
2
R
1
= R
2
See Application Bulletin
AB-061 for details.
R
F
≥
1M
C
F
(a)
(c)
(b)
+15V
–15V
Q
2N5116
Bootstrap
Buffer
S
D
From
Pin 2
+15V
–15V
Q
1
2N6427
From
Pin 2
To Pin 7
R
1
6.8k
R
1
7.5k
OPT211
7
8
3
1
5
V
OUT
2
–15V
+15V
λ
OPA131
To Pin 7
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|---|---|
| OPT211P-J | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| OPT3001DNPR | 功能描述:Optical Sensor Ambient 550nm I2C 6-UDFN Exposed Pad 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類(lèi)型:環(huán)境 波長(zhǎng):550nm 接近探測(cè):無(wú) 輸出類(lèi)型:I2C 電壓 - 電源:1.6 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:6-USON（2x2） 標(biāo)準(zhǔn)包裝:1 |
| OPT3001DNPT | 功能描述:Optical Sensor Ambient 550nm I2C 6-UDFN Exposed Pad 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類(lèi)型:環(huán)境 波長(zhǎng):550nm 接近探測(cè):無(wú) 輸出類(lèi)型:I2C 電壓 - 電源:1.6 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:6-USON（2x2） 標(biāo)準(zhǔn)包裝:1 |
| OPT3001EVM | 功能描述:OPT3001 - Light, Ambient Sensor Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 傳感器類(lèi)型:環(huán)境光 感應(yīng)范圍:- 接口:I2C 靈敏度:550nm 電壓 - 電源:1.6 V ~ 3.6 V 嵌入式:- 所含物品:2 板，線纜 使用的 IC/零件:OPT3001 標(biāo)準(zhǔn)包裝:1 |
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