Datasheet

AD7723
Rev. C | Page 16 of 32
CODE
2000
0
32700 3271332702
FREQUENCY OF OCCURRENCE
32704 32706 32708 32710 32712
1800
800
600
400
200
1400
1000
1600
1200
V
IN
(+) = V
IN
(–)
8192 SAMPLES TAKEN
01186-018
Figure 18. Histogram of Output Codes with DC Input
(Output Data Rate = 1.2 MHz)
CODE
5000
0
32703 3271032704
FREQUENCY OF OCCURRENCE
32705 32706 32707 32708 32709
4500
2000
1500
1000
500
3500
2500
4000
3000
V
IN
(+) = V
IN
(–)
8192 SAMPLES TAKEN
01186-019
Figure 19. Histogram of Output Codes with DC Input
(Output Data Rate = 600 kHz)
1.0
0.8
–0.8
0
6553516384 32768 49152
0.2
–0.2
–0.4
–0.6
0.6
0.4
0
–1.0
67108864 SAMPLES TAKEN
DIFFERENTIAL MODE
CODE
DNL ERROR (LSB)
01186-020
Figure 20. Differential Nonlinearity (Output Data Rate = 1.2 MHz)
AD8047
AD8047
R
FB
220Ω
220Ω
27Ω
220pF
A1
A2
VIN(+)
VIN(–)
REF1
REF2
AD7723
10nF220nF
220Ω
27Ω
AIN = ±2V
BIASED
ABOUT
GROUND
1µF
R
SOURCE
50Ω
R
IN
390Ω
R
BALANCE1
220Ω
G
AIN = 2 × R
FB
/(R
IN
+ R
SOURCE
)
R
BALANCE1
= R
BALANCE2
× (R
IN
+ R
SOURCE
)/(2 × R
FB
)
R
REF2
= R
REF1
× (R
IN
+ R
SOURCE
)/R
FB
R
REF1
10kΩ
R
REF2
20kΩ
R
BALANCE2
R
BALANCE2
01186-021
21
23
19
20
Figure 21. Differential Nonlinearity (Output Data Rate = 600 kHz)
1.0
0.8
–0.8
0
6553516384 32768 49152
0.2
–0.2
–0.4
–0.6
0.6
0.4
0
–1.0
67108864 SAMPLES TAKEN
DIFFERENTIAL MODE
CODE
INL ERROR (LSB)
01186-022
Figure 22. Integral Nonlinearity (Output Data Rate =1.2 MHz)
1.0
0.8
–0.8
0
6553516384 32768 49152
0.2
–0.2
–0.4
–0.6
0.6
0.4
0
–1.0
67108864 SAMPLES TAKEN
DIFFERENTIAL MODE
CODE
INL ERROR (LSB)
01186-023
Figure 23. Integral Nonlinearity (Output Data Rate = 600 kHz)