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MCP6244E Datasheet(PDF) 10 Page - Microchip Technology

Part # MCP6244E
Description  50 uA, 550 kHz Rail-to-Rail Op Amp
Download  28 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6244E Datasheet(HTML) 10 Page - Microchip Technology

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MCP6241/2/4
DS21882C-page 10
© 2005 Microchip Technology Inc.
4.7
Application Circuits
4.7.1
MATCHING THE IMPEDANCE AT
THE INPUTS
To minimize the effect of offset voltage in an amplifier
circuit, the impedances at the inverting and non-
inverting inputs need to be matched. This is done by
choosing the circuit resistor values so that the total
resistance at each input is the same. Figure 4-7 shows
a summing amplifier circuit.
FIGURE 4-7:
Summing Amplifier Circuit.
To match the inputs, set all voltage sources to ground
and calculate the total resistance at the input nodes. In
this summing amplifier circuit, the resistance at the
inverting input is calculated by setting VIN1, VIN2 and
VOUT to ground. In this case, RG1, RG2 and RF are in
parallel. The total resistance at the inverting input is:
At the non-inverting input, VDD is the only voltage
source. When VDD is set to ground, both RX and RY are
in parallel. The total resistance at the non-inverting
input is:
To minimize offset voltage and increase circuit
accuracy, the resistor values need to meet the
condition:
4.7.2
COMPENSATING FOR THE
PARASITIC CAPACITANCE
In analog circuit design, the PCB parasitic capacitance
can compromise the circuit behavior; Figure 4-8 shows
a typical scenario. If the input of an amplifier sees
parasitic capacitance of several picofarad (CPARA,
which includes the common mode capacitance of 6 pF,
typical) and large RF and RG,the frequency response
of the circuit will include a zero. This parasitic zero
introduces gain peaking and can cause circuit
instability.
FIGURE 4-8:
Effect of Parasitic
Capacitance at the Input.
One solution is to use smaller resistor values to push
the zero to a higher frequency. Another solution is to
compensate by introducing a pole at the point at which
the zero occurs. This can be done by adding CF in
parallel with the feedback resistor (RF). CF needs to be
selected so that the ratio CPARA:CF is equal to the ratio
of RF:RG.
MCP624X
VOUT
VIN2
+
VIN1
RG2
RG1
RF
RZ
VDD
RX
RY
R
VIN
1
1
R
G1
---------
1
R
G2
---------
1
R
F
------
++
⎝⎠
⎛⎞
---------------------------------------------
=
Where:
RVIN– = total resistance at the inverting input
R
VIN+
1
1
R
X
------
1
R
Y
------
+
⎝⎠
⎛⎞
-------------------------
R
Z
+
=
Where:
RVIN+ = total resistance at the inverting
input
R
VIN+
R
VIN
=
VOUT
CF
VDC
+
VAC
RG
RF
CPARA
C
F
C
PARA
R
G
R
F
-------
=
MCP624X


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