Datasheet

© 2011 Microchip Technology Inc. DS25073A-page 11
MCP6N11
Figure 1-9 shows V
ED
vs. V
DM
, as well as a linear fit
line (V
ED_LIN
) based on V
E
and g
E
. The op amp is in
standard conditions (ΔV
OUT
=0, etc.). V
DM
is swept
from V
DML
to V
DMH
.
FIGURE 1-9: Differential Input Error vs.
Differential Input Voltage.
Based on the measured V
ED
data, we obtain the
following linear fit:
EQUATION 1-11:
Note that the V
E
value measured here is not as
accurate as the one obtained in Section 1.5.1 “Input
Offset Related Errors”.
The remaining error (ΔV
ED
) is described by the
Differential Mode Non-Linearity spec:
EQUATION 1-12:
V
1
V
3
V
ED
, V
ED_LIN
(V)
V
DM
(V)
V
DML
V
DMH
0
V
2
V
ED_LIN
V
ED
ΔV
ED
Where:
V
ED_LIN
1g
E
+()V
E
g
E
V
DM
+=
g
E
V
3
V
1
–
V
DMH
V
DML
–
----------------------------------- 1–=
V
E
V
2
1g
E
+
----------------=
Where:
INL
DM
max Δ V
ED
V
DMH
V
DML
–
-----------------------------------=
Δ V
ED
V
ED
V
ED_LIN
–=