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MCP616 Datasheet(PDF) 19 Page - Microchip Technology

Part No. MCP616
Description  2.3V to 5.5V Micropower Bi-CMOS Op Amps
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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MCP616 Datasheet(HTML) 19 Page - Microchip Technology

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© 2008 Microchip Technology Inc.
DS21613C-page 19
MCP616/7/8/9
4.9.3
THREE OP AMP
INSTRUMENTATION AMPLIFIER
A classic, three-op amp instrumentation amplifier is
illustrated in Figure 4-11. The two-input op amps
provide differential signal gain and a common mode
gain of +1. The output op amp is a difference amplifier,
which converts its input signal from differential to a
single-ended output; it rejects common mode signals at
its input. The gain of this circuit is simply adjusted with
one resistor (RG). The reference voltage (VREF) is
typically referenced to mid-supply (VDD/2) in single-
supply applications.
FIGURE 4-11:
Three-Op Amp
Instrumentation Amplifier.
4.9.4
PRECISION GAIN WITH GOOD
LOAD ISOLATION
In Figure 4-12, the MCP616 op amp, R1 and R2 provide
a high gain to the input signal (VIN). The MCP616’s low
offset voltage makes this an accurate circuit.
The MCP606 is configured as a unity-gain buffer. It
isolates the MCP616’s output from the load, increasing
the high gain stage’s precision. Since the MCP606 has
a higher output current, and the two amplifiers are
housed in separate packages, there is minimal change
in the MCP616’s offset voltage due to loading effect.
FIGURE 4-12:
Precision Gain with Good
Load Isolation.
V
OUT
V
1
V
2
() 1
2R
2
R
G
---------
+
⎝⎠
⎜⎟
⎛⎞ R
4
R
3
------
⎝⎠
⎜⎟
⎛⎞
V
REF
+
=
R2
MCP617
VREF
V1
½
R4
R3
MCP616
R2
RG
MCP617
VOUT
V2
½
R4
R3
V
OUT
V
IN 1R2 R1
+
()
=
R2
R1
MCP616
VOUT
VIN
MCP606


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