參數(shù)資料
型號： MCP601T-ICH
廠商： Microchip Technology Inc.
英文描述： 2.7V to 6.0V Single Supply CMOS Op Amps
中文描述： 2.7V至6.0V的單電源CMOS運算放大器
文件頁數(shù)： 15/34頁
文件大小： 460K
代理商： MCP601T-ICH
2007 Microchip Technology Inc.
DS21314G-page 15
MCP601/1R/2/3/4
4.8.2
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 4-10
. One advantage of this approach is unity-
gain operation, while one disadvantage is that the
common mode input range is reduced as R
2
/R
G
gets
larger.
FIGURE 4-10:
Instrumentation Amplifier.
Three-Op Amp
The two-op amp instrumentation amplifier is shown in
Figure 4-11
. 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 4-11:
Instrumentation Amplifier.
Two-Op Amp
Both instrumentation amplifiers should use a bulk
bypass capacitor of at least 1 μF. The CMRR of these
amplifiers will be set by both the op amp CMRR and
resistor matching.
4.8.3
PHOTO DETECTION
The MCP601/1R/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 (R
2
) in the feedback loop of the
amplifiers shown in
Figure 4-12
and
Figure 4-13
. The
optional capacitor (C
2
) sometimes provides stability for
these circuits.
A photodiode configured in the Photovoltaic mode has
zero voltage potential placed across it (
Figure 4-12
). 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 4-12:
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 4-13
). This
decreases the diode capacitance, which facilitates
high-speed
operation
(e.g.,
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).
high-speed
digital
FIGURE 4-13:
Detector.
Photoconductive Mode
MCP60X
V
1
MCP60X
V
2
R
2
R
2
R
3
MCP60X
R
4
R
3
R
4
V
OUT
V
REF
R
G
+
–
–
+
–
+
V
OUT
V
1
V
2
–
(
)
1
2
R
2
R
G
---------
+
R
4
R
3
-----
V
REF
+
=
MCP60X
+
V
2
R
G
R
2
R
2
MCP60X
+
R
1
V
OUT
V
REF
V
1
R
1
-
-
V
OUT
V
1
V
2
–
(
)
1
R
1
R
2
-----
2
R
1
R
G
--------
+
+
V
REF
+
=
D
1
Light
V
OUT
V
DD
MCP60X
R
2
C
2
I
D1
V
OUT
= I
D1
R
2
–
+
D
1
Light
V
OUT
V
DD
MCP60X
R
2
C
2
I
D1
V
OUT
= I
D1
R
2
V
BIAS
< 0V
V
BIAS
–
+
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP601T-IOT 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
MCP601T-IP 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
MCP601T-ISL 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
MCP601T-ISN 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
MCP601T-IST 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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