User manual

Installation and Operation
© 2011 Microchip Technology Inc. DS52005A-page 15
2.3.1.6 DIFFERENCE AMPLIFIER
This circuit amplifies the difference between two voltages, while rejecting the Common
mode input voltage. Output voltage can be shifted by a reference voltage for single
supply operation.
Fill the sockets with the recommended resistors and capacitors (see the circuit diagram
shown in Figure 2-8).
FIGURE 2-8: Difference Amplifier Block.
The jumper positions have the following effect:
• JP1 connected to ground: the output voltage will be centered on 0V.
• JP1 connected to V
REF
: the output voltage will be centered on 8V.
2.4 MCP6H04 EVALUATION BOARD OPERATION
This section covers the following topics:
• Building the Amplifier
• Testing the Amplifier
2.4.1 Building the Amplifier
The accessory bag that comes with this kit facilitates the evaluation of the amplifier
described below.
The amplifier characteristics are:
• Instrumentation amplifier (Single supply operation)
• Power supply voltage = 16V
• Desired Gain = 101 V/V
• Load Capacitance = 56 pF
+
-
R
1
R
2
R
2
*
R
L
V
DD
V
OUT1
V
OUT2
V
REF
R
1
*
V
C
J
P1