Datasheet
© 2006 Microchip Technology Inc. DS22004B-page 7
MCP6G01/1R/1U/2/3/4
1.1 DC Output Voltage Specs / Model
1.1.1 IDEAL MODEL
The ideal SGA output voltage (V
OUT
) is (see Figure 1-3):
EQUATION 1-1:
This equation holds when there are no gain or offset
errors.
1.1.2 LINEAR MODEL
The SGA’s linear region of operation is modeled by the
line V
O_LIN
shown in Figure 1-3. V
O_LIN
includes offset
and gain errors, but does not include non-linear effects.
EQUATION 1-2:
This line’s endpoints are 0.3V from the supply rails
(V
O_ID
= 0.3V and V
DD
– 0.3V). The gain error and
input offset voltage specifications (in the electrical
specifications) relate to Figure 1-3 as follows:
EQUATION 1-3:
The input offset specification describes V
OS
at
G=+1V/V.
The DC Gain Drift (ΔG/ΔT
A
) can be calculated from the
change in g
E
across temperature. This is shown in the
following equation:
EQUATION 1-4:
FIGURE 1-3: Output Voltage Model.
1.1.3 OUTPUT NON-LINEARITY
Figure 1-4 shows the Integral Non-Linearity (INL) of the
output voltage. INL is the output non-linearity error not
explained by V
O_LIN
:
EQUATION 1-5:
The output non-linearity specification (in the Electrical
Specifications, with units of % of FSR) is related to
Figure 1-4 by:
EQUATION 1-6:
Note that the Full Scale Range (FSR) is V
DD
–0.6V
(0.3V to V
DD
–0.3V).
Where:
G is the nominal gain
V
O_ID
GV
IN
=
V
REF
V
SS
0V==
V
O_LIN
G 1 g
E
+()V
IN
0.3V
G
----------- - V
OS
+–
⎝⎠
⎛⎞
0.3V+=
V
REF
V
SS
0V==
Where:
G is the nominal gain
g
E
is the gain error
V
OS
is the input offset voltage
g
E
100%
V
2
V
1
–
V
DD
0.6V–
---------------------------- -
⋅=
V
OS
V
1
G 1 g
E
+()
------------------------ -
,= G +1=
Where:
V
1
V
OUT
V
O_ ID
,–= V
O_ ID
0.3V=
V
2
V
OUT
V
O_ ID
,–= V
O_ ID
V
DD
0.3V–=
GΔ T
A
Δ⁄ G
g
E
Δ
T
A
Δ
--------- -
,⋅=
in units of V/V/°C
GΔ T
A
Δ⁄ 100%
g
E
Δ
T
A
Δ
--------- -
,⋅=
in units of %/°C
0
0
0.3
V
DD
-0.3
V
DD
V
O
UT
V
OUT
(V)
V
IN
(V)
0.3 V
DD
-0.3 V
DD
GGG
V
1
V
O
_
I
D
V
O
_
L
I
N
V
2
INL V
OUT
V
O_ LIN
–=
V
ONL
100%
max V
3
V
4
,()
V
DD
0.6V–
-------------------------------
⋅=
V
3
max INL–()=
Where:
V
4
max INL()=