AD7606/AD7606-6/AD7606-4
1400
1200
1000
800
600
400
200
0
Figure 49 to Figure 55 illustrate the effect of oversampling on
the code spread in a dc histogram plot. As the oversample rate
is increased, the spread of the codes is reduced.
1000
OVERSAMPLING BY 8
= 25kSPS
1263
F
SAMPLE
AV = 5V
CC
V
= 2.5V
DRIVE
NO OVERSAMPLING
= 200kSPS
928
887
783
F
SAMPLE
AV = 5V
900
800
700
600
500
400
300
200
100
0
CC
V
= 2.5V
DRIVE
0
0
2
0
2
0
3
–3
–2
–1
0
1
CODE (LSB)
131
–1
97
2
Figure 52. Histogram of Codes—OS × 8 (Three Codes)
0
3
2
3
1400
OVERSAMPLING BY 16
= 12.5kSPS
–3
–2
0
1
1453
F
SAMPLE
AV = 5V
CODE (LSB)
1200
1000
800
600
400
200
0
CC
V
= 2.5V
DRIVE
Figure 49. Histogram of Codes—No OS (Six Codes)
1400
OVERSAMPLING BY 2
= 100kSPS
F
SAMPLE
AV = 5V
1200
1000
800
600
400
200
0
CC
1148
V
= 2.5V
DRIVE
595
804
0
0
0
0
2
0
3
–3
–2
–1
0
1
CODE (LSB)
Figure 53. Histogram of Codes—OS × 16 (Two Codes)
80
–1
1600
16
2
0
0
0
3
OVERSAMPLING BY 32
= 6.125kSPS
1417
F
SAMPLE
AV = 5V
–3
–2
0
1
1400
1200
1000
800
600
400
200
0
CC
CODE (LSB)
V
= 2.5V
DRIVE
Figure 50. Histogram of Codes—OS × 2 (Four Codes)
1400
OVERSAMPLING BY 4
= 50kSPS
1262
F
SAMPLE
AV = 5V
1200
1000
800
600
400
200
0
CC
631
V
= 2.5V
DRIVE
764
0
0
0
0
2
0
3
–3
–2
–1
0
1
CODE (LSB)
Figure 54. Histogram of Codes—OS × 32 (Two Codes)
1600
OVERSAMPLING BY 64
= 3kSPS
1679
19
–1
0
0
3
2
0
3
F
SAMPLE
AV = 5V
1400
1200
1000
800
600
400
200
0
CC
–3
–2
0
1
V
= 2.5V
DRIVE
CODE (LSB)
Figure 51. Histogram of Codes—OS × 4 (Four Codes)
369
0
0
0
0
2
0
3
–3
–2
–1
0
1
CODE (LSB)
Figure 55. Histogram of Codes—OS × 64 (Two Codes)
Rev. 0 | Page 30 of 36
ADI [ ADI ]
