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MCP6XXX Amplifier Evaluation Board 3 User’s Guide
The jumper JP S1 positions have the following effects:
Jumper JP S1
Effects
Position
V 1 =
V 2 =
1
2
3
V A
V A
V A
V A
–V A
V B
V A is a common mode input signal
V A is a diffential mode input signal
V A and V B are connected directly to V 1 and V 2
Note 1:
When JP S1 is in position 2, V 2 is actually described by the following equation:
V 2 = V R – ( V A – V R ) ( R S2 ? R S1 )
= V R ( 1 + R S2 ? R S1 ) – V A ( R S2 ? R S1 )
It is assumed that R S2 = R S1 .
Figure 2-8 shows an example supported by the MCP6XXX Amplifier Evaluation Board
3. It is assumed that V A is a differential mode input signal.
* Test Points
GND
Mid-supply
Reference
Block
VREF
VDD
Power Supply
VA
R3
R4
0.1 μF
VDD
CU1
DP1
Source
CP1
1.0 μF
1
R1
R2
RISO
U1
Configuration
Block
2
3
GND
VB
CL
RL
VL
GND
FIGURE 2-8:
Difference Amplifier Example Supported by the MCP6XXX
Amplifier Evaluation Board 3.
DS51673A-page 12
? 2007 Microchip Technology Inc.
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