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| 型號(hào)： | MCP604T-E/SL |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | QUAD OP-AMP, 4500 uV OFFSET-MAX, 2.8 MHz BAND WIDTH, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, MS-012, SOIC-14 |
| 文件頁(yè)數(shù)： | 5/28頁(yè) |
| 文件大?。?/td> | 601K |
| 代理商： | MCP604T-E/SL |
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2004 Microchip Technology Inc.
DS21314F-page 13
MCP601/2/3/4
3.7.2
INSTRUMENTATION AMPLIFIER
CIRCUITS
Instrumentation amplifiers have a differential input that
subtracts one input voltage from another and rejects
common mode signals. These amplifiers also provide a
single-ended output voltage.
The three-op amp instrumentation amplifier is illustrated
in Figure 3-7. One advantage of this approach is unity-
gain operation, while one disadvantage is that the
common mode input range is reduced as R2/RG gets
larger.
FIGURE 3-7:
Three-Op Amp
Instrumentation Amplifier.
The two-op amp instrumentation amplifier is shown in
Figure 3-8. While its power consumption is lower than
the three-op amp version, its main drawbacks are that
the common mode range is reduced with higher gains
and it must be configured in gains of two or higher.
FIGURE 3-8:
Two-Op Amp
Instrumentation Amplifier.
Both instrumentation amplifiers should use a bulk
bypass capacitor of at least 1 F. The CMRR of these
amplifiers will be set by both the op amp CMRR and
resistor matching.
3.7.3
PHOTO DETECTION
The MCP601/2/3/4 op amps can be used to easily
convert the signal from a sensor that produces an
output current (such as a photo diode) into a voltage (a
transimpedance amplifier). This is implemented with a
single resistor (R2) in the feedback loop of the
amplifiers shown in Figure 3-9 and Figure 3-10. The
optional capacitor (C2) sometimes provides stability for
these circuits.
A photodiode configured in the Photovoltaic mode has
zero voltage potential placed across it (Figure 3-9). In
this mode, the light sensitivity and linearity is
maximized, making it best suited for precision
applications. The key amplifier specifications for this
application are: low input bias current, low noise,
common mode input voltage range (including ground)
and rail-to-rail output.
FIGURE 3-9:
Photovoltaic Mode Detector.
In contrast, a photodiode that is configured in the
Photoconductive mode has a reverse bias voltage
across the photo-sensing element (Figure 3-10). This
decreases the diode capacitance, which facilitates
high-speed
operation
(e.g.,
high-speed
digital
communications). The design trade-off is increased
diode leakage current and linearity errors. The op amp
needs to have a wide Gain Bandwidth Product
(GBWP).
FIGURE 3-10:
Photoconductive Mode
Detector.
MCP60X
V1
MCP60X
V2
R2
R3
MCP60X
R4
R3
R4
VOUT
VREF
RG
+
–
+
–
+
VOUT
V1 V2
–
() 1
2R2
RG
---------
+
R4
R3
------
V
REF
+
=
MCP60X
V2
RG
R2
MCP60X
R1
VOUT
VREF
V1
R1
-
+
-
+
VOUT
V1 V2
–
() 1
R1
R2
------
2R1
RG
---------
++
V
REF
+
=
D1
Light
VOUT
VDD
MCP60X
R2
C2
ID1
VOUT = ID1 R2
–
+
D1
Light
VOUT
VDD
MCP60X
R2
C2
ID1
VOUT = ID1 R2
VBIAS
VBIAS < 0V
–
+
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相關(guān)代理商/技術(shù)參數(shù) |
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| MCP604T-ESN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V to 6.0V Single Supply CMOS Op Amps |
| MCP604T-EST | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V to 6.0V Single Supply CMOS Op Amps |
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| MCP604T-I/SL | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 2.7V RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MCP604T-I/ST | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 2.7V RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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