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MCP6141 Datasheet(PDF) 14 Page - Microchip Technology

Part # MCP6141
Description  600 nA, Non-Unity Gain Rail-to-Rail Input/Output Op Amps
PDF  32 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6141 Datasheet(HTML) 14 Page - Microchip Technology

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MCP6141/2/3/4
21668A-page 14
2002 Microchip Technology Inc.
In this configuration, the amplifier outputs the sum of
the three input voltages. The ratio of the sum and the
output voltage is defined using the feedback and input
resistors. VREF is used to offset the output voltage. This
family of amplifiers is stable for noise gain (Gn) of 10 V/
V or higher. The Gn and the signal gain of the summing
amplifier is calculated as shown below:
EQUATION
At a noise gain of 10 V/V, the amplifier bandwidth is
approximately 10 kHz. The bandwidth to quiescent cur-
rent ratio of MCP6141/2/3/4 makes this device an
appropriate choice for battery-powered applications.
Gn
1RF
1
R1
------
1
R2
------
1
R3
------
++


+
10 V/V
≥
=
Noise Gain:
Signal Gain:
V01
RF
–
R1
--------- V1
×
=
V02
RF
–
R2
--------- V2
×
=
V03
RF
–
R3
--------- V3
×
=
V04
1
RF
R1
------
RF
R2
------
RF
R3
------
++
+

 V
REF
×
=
VOUT
RF
VREF V1
–
R1
-----------------------
VREF V2
–
R2
-----------------------
VREF V3
–
R3
-----------------------
++
VREF
+
=
VOUT
V01 V02 V03 V04
+++
=



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