Datasheet

Data Sheet AD7606/AD7606-6/AD7606-4
Rev. C | Page 31 of 36
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.
Figure 56 to Figure 61 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.
0
–10
–20
–30
–40
–50
–60
–70
–80
100 1k 10k 100k 10M1M
–90
ATTENUATION (dB)
FREQUENCY (Hz)
08479-051
AV
CC
= 5V
V
DRIVE
= 5V
T
A
= 25°C
10V RANGE
OS BY 2
Figure 56. Digital Filter Response for OS 2
0
–10
–20
–30
–40
–50
–60
–70
–80
100 1k 10k 100k 10M1M
–100
–90
ATTENUATION (dB)
FREQUENCY (Hz)
08479-052
AV
CC
= 5V
V
DRIVE
= 5V
T
A
= 25°C
10V RANGE
OS BY 4
Figure 57. Digital Filter Response for OS 4
0
–10
–20
–30
–40
–50
–60
–70
–80
100 1k 10k 100k 10M1M
–100
–90
ATTENUATION (dB)
FREQUENCY (Hz)
08479-053
AV
CC
= 5V
V
DRIVE
= 5V
T
A
= 25°C
10V RANGE
OS BY 8
Figure 58. Digital Filter Response for OS 8
0
–10
–20
–30
–40
–50
–60
–70
–80
100 1k 10k 100k 10M1M
–100
–90
ATTENUATION (dB)
FREQUENCY (Hz)
08479-154
AV
CC
= 5V
V
DRIVE
= 5V
T
A
= 25°C
10V RANGE
OS BY 16
Figure 59. Digital Filter Response for OS 16
0
–10
–20
–30
–40
–50
–60
–70
–80
100 1k 10k 100k 10M1M
–100
–90
ATTENUATION (dB)
FREQUENCY (Hz)
08479-155
AV
CC
= 5V
V
DRIVE
= 5V
T
A
= 25°C
10V RANGE
OS BY 32
Figure 60. Digital Filter Response for OS 32
0
–10
–20
–30
–40
–50
–60
–70
–80
100 1k 10k 100k 10M1M
–100
–90
ATTENUATION (dB)
FREQUENCY (Hz)
08479-156
AV
CC
= 5V
V
DRIVE
= 5V
T
A
= 25°C
10V RANGE
OS BY 64
Figure 61. Digital Filter Response for OS 64