50 Hz/60 Hz Rejection, Sinc4 Filter Fig" />
參數(shù)資料
型號(hào)： EVAL-AD7193EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 46/57頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR AD7193
設(shè)計(jì)資源： EVAL-AD7193 Schematic
AD7193 Gerber Files
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7193
已供物品： 板，線纜
Data Sheet
AD7193
Rev. D | Page 49 of 56
50 Hz/60 Hz Rejection, Sinc4 Filter
Figure 57 shows the frequency response when FS[9:0] is set to 6
and the postfilter averages by 16. This gives an output data rate
of 42.10 Hz when the master clock equals 4.92 MHz. The sinc
filter places the first notch at
fNOTCH = fCLK/(1024 × FS[9:0])
The postfiltering places notches at fNOTCH/Avg (Avg is the amount of
averaging) and multiples of this frequency; therefore, when FS[9:0]
is set to 6 and the postfilter averaging is 16, a notch is placed at
800 Hz due to the sinc filter and notches are placed at 50 Hz
and multiples of 50 Hz due to the postfilter. The notch at 50 Hz
is a first-order notch; therefore, the notch is not wide. This means
that the rejection at 50 Hz exactly is good, assuming a stable
4.92 MHz master clock. However, in a band of 50 Hz ± 1 Hz, the
rejection degrades significantly. The rejection at 50 Hz ± 0.5 Hz is
40 dB minimum, assuming a stable clock; therefore, a good master
clock source is recommended when using fast settling mode.
08367-
053
–120
–110
–100
–90
–80
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–60
–50
–40
–30
–20
–10
0
30
60
90
120
150
FREQUENCY (Hz)
FI
L
T
E
R
G
AI
N
(
d
B)
Figure 57. Filter Response for Average + Decimate Filter
(Sinc4 Filter, FS[9:0] = 6, Average by 16)
Figure 58 shows the filter response when FS[9:0] is set to 5 and
the postfilter averages by 16. In this case, the output data rate is
equal to 50.53 Hz (4.92 MHz master clock) while the first filter
notch is placed at 60 Hz. The rejection at 60 Hz ± 0.5 Hz is equal to
40 dB minimum.
08367-
058
–120
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–100
–90
–80
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–60
–50
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–10
0
30
60
90
120
150
FREQUENCY (Hz)
FI
L
T
E
R
G
AI
N
(
d
B)
Figure 58. Filter Response for Average + Decimate Filter
(Sinc4 Filter, FS[9:0] = 5, Average by 16)
Simultaneous 50 Hz/60 Hz rejection is achieved when FS[9:0] is
set to 30 and the postfilter averages by 16. The output data rate
is equal to 8.4 Hz, whereas the rejection at 50 Hz ± 0.5 Hz and
60 Hz ± 0.5 Hz is typically 44 dB.
08367-
059
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
FREQUENCY (Hz)
FI
L
T
E
R
G
AI
N
(
d
B)
0
30
60
90
120
150
Figure 59. Filter Response for Average + Decimate Filter
(Sinc4 Filter, FS[9:0] = 30, Average by 16)
Simultaneous 50 Hz and 60 Hz rejection is also achieved by
using an FS word of 96 and averaging by 16; this places a notch
at 50 Hz. Setting the REJ60 bit to 1 places a notch at 60 Hz (see
Figure 60). The output data rate is reduced to 2.63 Hz with this
configuration but the rejection is improved to typically 100 dB
at 50 Hz ± 1 Hz and 60 Hz ± 1 Hz.
–120
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–100
–90
–80
–70
–60
–50
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0
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150
FREQUENCY (Hz)
FILTE
R
G
A
IN
(
dB
)
08367-
157
Figure 60. Filter Response for Average + Decimate Filter
(Sinc4 Filter, FS[9:0] = 96, Average by 16)
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