Analog Devices ADV7850 Hardware Manual page 67

aa_filter_en1, AFE, Address 0x05[1]
This control is used to enable the anti-aliasing filter on ADC1.
Function
aa_filter_en1
0 
1
aa_filter_en0, AFE, Address 0x05[0]
This control is used to enable the anti-aliasing filter on ADC0.
Function
aa_filter_en0
0 
1
aa_filt_prog_bw and aa_filt_high_bw
aa_filt_prog_bw[1:0] combined with the AA_FILT_HIGH_BW[1:0] bits control the anti alias filter response to be selected. The chosen
response is applied to all four AA filters simultaneously.
frequency (Fc) is also shown in the table. All possible filter responses are shown in
aa_filt_high_bw[1:0], AFE, Address 0x06[5]; Address 0x07[7]
This control is used to program the anti-alias bandwidth on the ADCs. aa_filt_prog_bw[1:0] combined with aa_filt_high_bw[1:0]
controls the anti-aliasing filter response.
Function
aa_filt_high_bw[1:0]
00 
01
10
11
aa_filt_prog_bw[1:0], AFE, Address 0x07[6:5]
This control is used to program the anti-alias bandwidth. It is used in conjunction with aa_filt_high_bw[1:0].
Function
aa_filt_prog_bw[1:0]
00 
Rev. A May 2012
Description
Disable
Enable
Description
Disable
Enable
Table 9
Description
Default, passband < 17 MHz
Passband < 42 MHz
Passband < 92 MHz
Passband < 146 MHz
Description
Default
shows how to choose the various filter characteristics. The 3db cutoff
Figure 15.
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ADV7850