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| 型號： | ARD00354 |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 21/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD REF DESIGN MCP6N11/MCP6V2X |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 儀表 |
| 輸出類型： | 滿擺幅 |
| 電流 - 輸出 / 通道： | 30mA |
| 工作溫度： | -40°C ~ 125°C |
| 電流供應(yīng)（主 IC）： | 800µA |
| 板類型： | 完全填充 |
| 已供物品： | 板，線纜 |
| 已用 IC / 零件： | MCP6N11，MCP6001，MCP6V26，MCP6V27，PIC18F2553 |
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MCP6N11
DS25073A-page 28
2011 Microchip Technology Inc.
4.1.3
DC ERRORS
defines some of the DC error specifications. These
errors are internal to the INA, and can be summarized
as follows:
EQUATION 4-5:
The non-linearity specs (INLCM and INLDM) describe
errors that are non-linear functions of VCM and VDM,
respectively. They give the maximum excursion from
linear response over the entire common mode and
differential ranges.
The input bias current and offset current specs (IB and
IOS), together with a circuit’s external input resistances,
give an additional DC error. Figure 4-3 shows the
resistors that set the DC bias point.
FIGURE 4-3:
DC Bias Resistors.
The resistors at the main input (RIP and RIM) and its
input bias currents (IBP and IBM) give the following
changes in the INA’s bias voltages:
EQUATION 4-6:
The best design results when RIP and RIM are equal
and small:
EQUATION 4-7:
The resistors at the feedback input (RR, RF and RG)
and its input bias currents (IBR and IBF) give the
following changes in the INA’s bias voltages:
EQUATION 4-8:
The best design results when GDMRR and RF are equal
and small:
EQUATION 4-9:
Where:
V
OUT
V
REF
G
DM 1gE
+
() V
DM
ΔV
ED
+
()
+
=
G
DM 1gE
+
() V
E
ΔV
E
+
()
+
Where:
PSRR
, CMRR and A
OL are in units of V/V
ΔT
A is in units of °C
V
E
V
OS
ΔV
DD
ΔV
SS
–
PSRR
---------------------------------
ΔV
CM
CMRR
-----------------
ΔV
RE F
CMRR
-----------------
++
+
=
ΔV
OUT
A
OL
-----------------
ΔT
A
ΔV
OS
ΔT
A
-------------
++
ΔV
ED
INL
DM VDMH
V
DML
–
()
≤
ΔV
E
INL
CM VIVH
V
IVL
–
()
≤
VOUT
VIP
VDD
VIM
VREF
RF
RG
RIP
RIM
RR
IBP
IBM
VFG
IBF
IBR
U1
MCP6N11
Where:
CMRR is in units of V/V
ΔV
IP
I
BPRIP
–
I
B
–
I
OS
2
--------
–
R
IP
==
ΔV
IM
I
BMRIM
–
I
B
–
I
OS
2
--------
+
R
IM
==
ΔV
CM
ΔV
IP
ΔV
IM
+
2
---------------------------------
=
I
–
B
R
IP
R
IM
+
2
-------------------------
I
–
OS
2
-----------
R
–
IP
R
IM
+
2
----------------------------
+
=
ΔV
DM
ΔV
IP
ΔV
IM
–
=
I
B
R
–
IP
R
IM
+
()
I
OS
2
--------R
IP
R
IM
+
()
–
=
ΔV
OUT
G
DM ΔVDM
ΔV
CM
CMRR
-----------------
+
=
Where:
RIP = RIM
ε
RTOL = tolerance of RIP and RIM
ΔV
OUT
G
DMΔVDM
≈
G
DM
2I
BεRTOL
I
OS
–
±
()R
IP
≈
Where:
IB2 meets the IB spec, but is not equal to IB
IOS2 meets the IOS spec, but is not equal to IOS
ΔV
REF
I
BRRR
–
I
B 2
–
I
OS2
2
----------
–
R
==
ΔV
FG
ΔV
REF,
≈
ΔV
OUT
I
B2 RF
G
DMRR
–
()
I
OS2
2
---------- R
F
G
DMRR
+
()
+
≈
due to high A
OL
Where:
GDMRR = RF
ε
RTOL = tolerance of RR, RF and RG
ΔV
OUT
2I
B2εRTOL
I
OS2
+
()
±
()R
F
≈
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