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MCP6286 Arkusz danych(PDF) 5 Page - Microchip Technology

Numer części MCP6286
Szczegółowy opis  Low Noise, Low Power Op Amp
PDF  28 Pages
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Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6286 Arkusz danych(HTML) 5 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22196A-page 5
MCP6286
1.2
Test Circuits
The circuit used for most DC and AC tests is shown in
Figure 1-1. It independently sets VCM and VOUT; see
Equation 1-1. The circuit’s common mode voltage is
(VP +VM)/2, not VCM. VOST includes VOS plus the
effects of temperature, CMRR, PSRR and AOL.
EQUATION 1-1:
FIGURE 1-1:
AC and DC Test Circuit for
Most Specifications.
G
DM
R
F RG
⁄
=
V
CM
V
P 11 GN
⁄
–
() V
REF 1 GN
⁄
()
+
=
V
OUT
V
REF
V
P
V
M
–
()G
DM
V
OSTGN
++
=
Where:
GDM = Differential Mode Gain
(V/V)
GN = Noise Gain
(V/V)
VCM = Op Amp’s Common Mode
Input Voltage
(V)
VOST = Op Amp’s Total Input Offset
Voltage
(mV)
V
OST
V
IN–
V
IN+
–
=
G
N
1
G
DM
+
=
VDD
MCP6286
RG
RF
VOUT
VM
CB2
CL
RL
VL
CB1
100 k
Ω
100 k
Ω
RG
RF
VREF = VDD/2
VP
100 k
Ω
100 k
Ω
60 pF
10 k
Ω
1µF
100 nF
VIN–
VIN+
CF
6.8 pF
CF
6.8 pF



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