Datasheet

AD5123/AD5143 Data Sheet
Rev. A | Page 18 of 28
TEST CIRCUITS
Figure 31 to Figure 35 define the test conditions used in the Specifications section.
A
W
B
NC
I
W
DUT
V
MS
NC = NO CONNECT
10878-031
Figure 31. Resistor Integral Nonlinearity Error (Rheostat Operation; R-INL, R-DNL)
A
W
B
DUT
V
MS
V+
V+ = V
DD
1LSB = V+/2
N
10878-032
Figure 32. Potentiometer Divider Nonlinearity Error (INL, DNL)
10878-033
A
W
B
DUT
I
W
= V
DD
/R
NOMINAL
V
M
S1
V
W
R
W
=
V
MS1
/I
W
NC =
NO C
ONN
EC
T
Figure 33. Wiper Resistance
A
W
B
V
MS
V+ = V
DD
±10%
PSRR (dB) = 20 LOG
V
MS
ΔV
DD
(
)
~
V
A
V
DD
Δ
V
MS
%
ΔV
DD
%
PSS (%/%) =
V+
Δ
10878-034
Figure 34. Power Supply Sensitivity and
Power Supply Rejection Ratio (PSS, PSRR)
+
–
DUT
CODE = 0x00
0.1V
V
SS
TO V
DD
R
SW
=
0.1V
I
SW
I
SW
W
B
A
= NC
10878-035
Figure 35. Incremental On Resistance