AD7606/AD7606-6/AD7606-4
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
When the oversampling mode is selected for the AD7606/
AD7606-6/AD7606-4, it has the effect of adding a digital filter
function after the ADC. The different oversampling rates and
the CONVST sampling frequency produce different digital filter
frequency profiles.
AV
= 5V
= 5V
CC
V
DRIVE
= 25°C
T
A
10V RANGE
OS BY 16
Figure 56 to Figure 60 show the digital filter frequency profiles for
the different oversampling rates. The combination of the analog
antialiasing filter and the oversampling digital filter can be used
to eliminate and reduce the complexity of the design of any filter
before the AD7606/AD7606-6/AD7606-4. The digital filtering
combines steep roll-off and linear phase response.
100
1k
10k
100k
1M
10M
0
AV
= 5V
CC
FREQUENCY (Hz)
V
= 5V
DRIVE
= 25°C
–10
–20
–30
–40
–50
–60
–70
–80
–90
T
A
Figure 59. Digital Filter Response for OS 16
10V RANGE
OS BY 2
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AV
= 5V
= 5V
CC
V
DRIVE
= 25°C
T
A
10V RANGE
OS BY 32
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 56. Digital Filter Response for OS 2
100
1k
10k
100k
1M
10M
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AV
= 5V
= 5V
CC
FREQUENCY (Hz)
V
DRIVE
= 25°C
T
A
Figure 60. Digital Filter Response for OS 32
10V RANGE
OS BY 4
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AV
= 5V
CC
V
T
= 5V
DRIVE
= 25°C
A
10V RANGE
OS BY 64
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 57. Digital Filter Response for OS 4
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100
1k
10k
100k
1M
10M
AV
= 5V
= 5V
CC
FREQUENCY (Hz)
V
DRIVE
= 25°C
T
A
Figure 61. Digital Filter Response for OS 64
10V RANGE
OS BY 8
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 58. Digital Filter Response for OS 8
Rev. 0 | Page 31 of 36
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