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Installation and Operation
2.3.1.4
INVERTING SUMMING AMPLIFIER
? Amplifies two or more input voltages with an inverting gain. Input and output
voltages are shifted by a reference voltage for single supply
? The Mindi? Amplifier Designer gives design recommendations for circuits with up
to 8 inputs; see the circuit diagram shown in Figure 2-6.
- Fill the sockets with the recommended resistors and capacitors
- Set JP1 and JP2 in the correct positions
(for the given example, JP1: Position A, JP2: Position C)
V S
V DD
Power
Supply
Mid-supply
Reference
V R
R 9
C U1
U 1
V OUT
Output
Load
V L
V 1
R 1
V 2
R 2
R 11
V 3
FIGURE 2-6:
R 3
Inverting Summing Amplifier Circuit Diagram.
Figure 2-7 shows an example of the inverting summing amplifier circuit diagram sup-
ported by MCP6XXX Amplifier Evaluation Board 2.
* Test Points
VDD
VIN-1
R1
GND
0.1μF
CU1
R2
JP1
A
U1
VIN-2
R3
B
R11
VIN-3
R4
JP2
R9
R10
RISO
GND
VIN-4
R5
C
D
VIN-5
R6
VDD
CL
RL
VL
RR2
VIN-6
VIN-7
VIN-8
R7
R8
RR1
20 k Ω
CR2
0.1 μF 20 k Ω
0.1 μF
CR1
UR1
VREF
GND
Power Supply
CP1
DP1 1.0 μF
VDD
FIGURE 2-7:
Inverting Summing Amplifier Example Supported by the
MCP6XXX Amplifier Evaluation Board 2.
? 2007 Microchip Technology Inc.
DS51668A-page 11
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