User manual

Installation and Operation
© 2007 Microchip Technology Inc. DS51668A-page 11
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)
FIGURE 2-6: 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.
FIGURE 2-7: Inverting Summing Amplifier Example Supported by the
MCP6XXX Amplifier Evaluation Board 2.
Output
Load
Mid-supply
Reference
Power
Supply
V
S
V
R
V
L
V
2
V
3
V
DD
R
1
R
2
R
3
R
9
R
11
C
U1
U
1
V
OUT
V
1
VIN-2
VIN-3
VIN-4
VIN-5
VIN-6
VIN-7
VIN-8
VIN-1
********
CR2
RR1
20 kΩ
RR2
20 kΩ
0.1 µF
UR1
U1
0.1µF
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
VL
VREF
GND
VDD
GND
GND
* Test Points
*
*
*
*
*
*