Datasheet

AD7943/AD7945/AD7948
REV. B –11–
Typical Performance Curves
V
REF
– Volts
0.5
0.4
0
2104
DNL – LSBS
68
0.3
0.2
0.1
V
DD
= +5V
T
A
= +258C
OP AMP = AD843
Figure 5. Differential Nonlinearity Error vs.
V
REF
(Normal Mode)
V
REF
– Volts
1.0
0.9
0
210468
0.6
0.3
0.2
0.1
0.8
0.7
0.4
0.5
INL – LSBS
V
DD
= +5V
T
A
= +258C
OP AMP = AD843
Figure 6. Integral Nonlinearity Error vs.
V
REF
(Normal Mode)
INPUT CODE
0.50
0.25
–0.50
0
40951024
LINEARITY ERROR – LSBS
2048
3072
0.00
–0.25
V
DD
= +5V
V
REF
= +10V
OP AMP = AD843
T
A
= +258C
Figure 7. All Codes Linearity In Normal Mode (V
DD
= +5 V)
|V
REF
– V
BIAS
| – Volts
6
0
0.2 1.40.4
INL, DNL – LSBS
0.6 0.8 1.0 1.2
5
4
3
2
1
V
DD
= +3.3V
T
A
= +258C
OP AMP = AD820
Figure 8. Linearity Error vs. V
REF
(Biased Mode)