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MCP602-ISN Datasheet(PDF) 15 Page - Microchip Technology

Part # MCP602-ISN
Description  2.7V to 6.0V Single Supply CMOS Op Amps
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP602-ISN Datasheet(HTML) 15 Page - Microchip Technology

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© 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 R2/RG gets
larger.
FIGURE 4-10:
Three-Op Amp
Instrumentation Amplifier.
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:
Two-Op Amp
Instrumentation Amplifier.
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 (R2) in the feedback loop of the
amplifiers shown in Figure 4-12 and Figure 4-13. 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 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.,
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 4-13:
Photoconductive Mode
Detector.
MCP60X
V1
MCP60X
V2
R2
R2
R3
MCP60X
R4
R3
R4
VOUT
VREF
RG
+
+
+
V
OUT
V
1
V
2
() 1
2R
2
R
G
---------
+
⎝⎠
⎛⎞ R4
R
3
------
⎝⎠
⎛⎞
V
REF
+
=
MCP60X
V2
RG
R2
R2
MCP60X
R1
VOUT
VREF
V1
R1
-
+
-
+
V
OUT
V
1
V
2
() 1
R
1
R
2
------
2R
1
R
G
---------
++
⎝⎠
⎛⎞
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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