V
DD1
V
DD2
+15 V
0.1 µF
+15 V
0.1 µF
1
8
0.1 µF
V
IN
404
2
HCPL-7840
3
6
7
0.1 µF
10 K
+
+
13.2
0.01 µF
10 K
V
OUT
–
AD624CD
GAIN = 4
–
AD624CD
GAIN = 10
4
5
0.47
µF
0.47
µF
-15 V
0.1 µF
0.1 µF
-15 V
10 K
0.47
µF
Figure 5. Gain and Nonlinearity Test Circuit.
0.1
0
0.10
0.08
∆G
– GAIN CHANGE – %
NL ERROR – % OF FULL SCALE
0.15
∆G
– GAIN CHANGE – %
vs. V
DD1
(V
DD2
= 5 V)
vs. V
DD2
(V
DD1
= 5 V)
T
A
= 25°C
200 mV ERROR
100 mV ERROR
0.10
V
DD1
= 5 V
V
DD2
= 5 V
V
IN–
= 0 V
T
A
= 25°C
0.06
0.04
0.02
0
-0.02
-0.04
-0.1
-0.2
-0.3
-0.4
-0.5
-40
0.05
0
V
DD1
= 5 V
V
DD2
= 5 V
-0.05
-20
0
20
40
60
80
100
-0.06
4.4
4.6
4.8
5.0
5.2
5.4
5.6
-0.10
-0.2
-0.1
0
0.1
0.2
T
A
– TEMPERATURE – °C
V
DD
– SUPPLY VOLTAGE – V
V
IN+
– INPUT VOLTAGE – V
Figure 6. Gain Change vs.
Temperature.
Figure 7. Gain Change vs. V
DD1
and
V
DD2
.
Figure 8. Nonlinearity Error Plot vs.
Input Voltage.
0.20
200 mV NL
100 mV NL
0.15
0.12
vs. V
DD1
(V
DD2
= 5 V)
NL – NONLINEARITY – %
0.060
vs. V
DD1
(V
DD2
= 5 V)
NL – NONLINEARITY – %
NL – NONLINEARITY – %
vs. V
DD2
(V
DD1
= 5 V)
0.11
T
A
= 25°C
0.10
vs. V
DD2
(V
DD1
= 5 V)
0.055
T
A
= 25°C
0.050
0.10
0.05
V
DD1
= 5 V
V
DD2
= 5 V
V
IN–
= 0 V
T
A
= 25 °C
0.09
0.045
0
-40
-20
0
20
40
60
80
100
0.08
4.4
4.6
4.8
5.0
5.2
5.4
5.6
0.040
4.4
4.6
4.8
5.0
5.2
5.4
5.6
T
A
– TEMPERATURE – °C
V
DD
– SUPPLY VOLTAGE – V
V
DD
– SUPPLY VOLTAGE – V
Figure 9. Nonlinearity vs.
Temperature.
Fibure 10. 200 mV Nonlinearity vs.
V
DD1
and V
DD2
.
Figure 11. 100 mV Nonlinearity vs.
V
DD1
and V
DD2
.
1-254
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
