User manual

MCP6XXX Amplifier Evaluation Board 2 User’s Guide
DS51668A-page 12 © 2007 Microchip Technology Inc.
2.3.1.5 NON-INVERTING SUMMING AMPLIFIER (NOT SUPPORTED)
• Amplifies two or more voltages with a non-inverting gain. Input and output
voltages are shifted by a reference voltage for single supply
• It is up to the user to design this circuit to produce the target gains for up to eight
inputs
- Select the correct resistor and capacitor values
- Set JP1 and JP2 as needed
(for the given example, JP1: Position B, JP2: Position D)
FIGURE 2-8: Non-Inverting Summing Amplifier Circuit Diagram.
Figure 2-9 shows an example of the non-inverting summing amplifier circuit diagram
supported by MCP6XXX Amplifier Evaluation Board 2.
FIGURE 2-9: Non-Inverting Summing Amplifier Example Supported by the
MCP6XXX Amplifier Evaluation Board 2.
Output
Load
Mid-supply
Reference
Power
Supply
V
S
V
DD
V
L
V
1
V
2
V
3
V
OUT
V
R
R
1
R
2
R
3
R
10
R
11
C
U1
U
1
CR2
RR1
20 kΩ
RR2
20 kΩ
0.1 µF
UR1
U1
0.1 µF
CU1
CR1
0.1 µF
A
B
DP1
CP1
1.0 µF
Power Supply
D
JP2
C
R10
R2
R3
R4
R5
R6
R7
R8
RL
CL
R11
VDD
R9
R1
RISO
JP1
VDD
VIN-2
VIN-3
VIN-4
VIN-5
VIN-6
VIN-7
VIN-8
VL
VREF
GND
VDD
VIN-1
GND
GND
* Test Points
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*
*
*
*
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