AD7943/AD7945/AD7948
Typical Performance Curves
0.5
0.50
0.25
V
V
= +5V
DD
V
T
= +5V
DD
= +10V
REF
= +25؇C
OP AMP = AD843
= +25؇C
A
0.4
0.3
0.2
OP AMP = AD843
T
A
0.00
–0.25
–0.50
0.1
0
2
4
6
8
10
1024
3072
4095
2048
0
V
– Volts
INPUT CODE
REF
Figure 5. Differential Nonlinearity Error vs.
REF (Normal Mode)
Figure 7. All Codes Linearity In Normal Mode (VDD = +5 V)
V
1.0
0.9
6
V
= +5V
DD
V
T
= +3.3V
DD
T
= +25؇C
A
= +25؇C
OP AMP = AD843
A
5
4
3
2
0.8
0.7
0.6
0.5
0.4
0.3
0.2
OP AMP = AD820
1
0
0.1
0
2
4
6
8
10
0.2
0.4
0.6
|V
0.8
1.0
| – Volts
1.2
1.4
V
– Volts
– V
REF
REF
BIAS
Figure 6. Integral Nonlinearity Error vs.
VREF (Normal Mode)
Figure 8. Linearity Error vs. VREF (Biased Mode)
REV. B
–11–
ADI [ ADI ]
