Datasheet

Data Sheet AD7608
Rev. A | Page 15 of 32
–1.0
–0.7
–0.3
–0.1
0.1
0.3
0.5
0.9
–0.9
–0.4
–0.5
–0.2
0
0.2
0.4
0.7
1.0
DNL (LSB)
CODE
–0.6
–0.8
0.8
0.6
08938-013
AV
CC
, V
DRIVE
= 5V
INTERNAL REFERENCE
f
SAMPLE
= 200 kSPS
T
A
= 25°C
±5V RANGE
0
25,000
50,000 75,000
100,000 125,000 150,000 175,000 200,000 225,000 250,000 262,144
Figure 14. Typical DNL, ±5 V Range
80
60
40
20
0
–20
–40
–60
–40 –25 –10 5 20 35 50 65 80
–80
NFS ERROR (LSB)
TEMPERATURE (°C)
200kSPS
AV
CC
, V
DRIVE
= 5V
EXTERNAL REFERENCE
±5V RANGE
±10V RANGE
08938-017
Figure 15. NFS Error vs. Temperature
80
60
40
20
0
–20
–40
–60
–40 –25 –10 5 20 35 50 65 80
–80
PFS ERROR (LSB)
TEMPERATURE (°C)
200kSPS
AV
CC
, V
DRIVE
= 5V
EXTERNAL REFERENCE
±5V RANGE
±10V RANGE
08938-118
Figure 16. PFS Error vs. Temperature
40
–40 –25 –10 5 20 35 50 65 80
–40
–32
–24
–16
–8
0
8
16
24
32
NFS/PFS CHANNEL MATCHING (LSB)
TEMPERATURE (°C)
±10V RANGE
AV
CC
, V
DRIVE
= 5V
EXTERNAL REFERENCE
PFS ERROR
NFS ERROR
08938-018
Figure 17. NFS/PFS Error Matching
10
8
6
4
2
0
0 120k100k80k60k40k20k
–2
PFS/NFS ERROR (%FS)
SOURCE RESISTANCE (Ω)
AV
CC
, V
DRIVE
= 5V
f
SAMPLE
= 200 kSPS
T
A
= 25°C
EXTERNAL REFERENCE
SOURCE RESISTANCE IS MATCHED ON
THE VxGND INPUT
±10V AND ±5V RANGE
08938-019
Figure 18. PFS/NFS Error vs. Source Resistance
80
85
90
95
100
105
10
100
1k 10k
100k
SNR (dB)
INPUT FREQUENCY (Hz)
AV
CC
, V
DRIVE
= 5V
f
SAMPLE
CHANGES WITH OS RATE
T
A
= 25°C
INTERNAL REFERENCE
±10V RANGE
08938-119
OS × 64
OS × 32
OS × 16
OS × 8
OS × 4
OS × 2
NO OS
Figure 19. SNR vs. Input Frequency for Different Oversampling Rates, ±10 V Range