Summary Of Filter Options - Analog Devices AD7194 Manual

SUMMARY OF FILTER OPTIONS

The AD7194 has several filter options. The filter that is chosen
affects the output data rate, settling time, the rms noise, the stop
band attenuation, and the 50 Hz/60 Hz rejection.
Table 36. Filter Summary
Filter
4
Sinc , Chop Disabled
4
Sinc , Chop Disabled
3
Sinc , Chop Disabled
4
Sinc , Chop Disabled
3
Sinc , Chop Disabled
4
Sinc , Chop Disabled
Sinc 4 , Chop Disabled
Sinc 3 , Chop Disabled
3
Sinc , Chop Disabled
4
Sinc , Chop Disabled
3
Sinc , Chop Disabled
4
Sinc , Chop Disabled, Zero
Latency
4
Sinc , Chop Disabled, Zero
Latency
Sinc 4 , Chop Disabled, Zero
Latency
4
Sinc , Chop Enabled
3
Sinc , Chop Enabled
Fast Settling (Sinc
Disabled, Average by 16)
Fast Settling (Sinc
Disabled, Average by 16)
Fast Settling (Sinc
Disabled, Average by 16)
Fast Settling (Sinc
Disabled, Average by 16)
Fast Settling (Sinc
Disabled, Average by 16)
Fast Settling (Sinc
Disabled, Average by 16)
1 These calculations assume a 4.92 MHz stable master clock.
2 Throughput is the rate at which conversions are available when several channels are enabled. In zero latency mode, the output data rate and throughput are equal.
3
For fast settling mode, the 50 Hz/60 Hz rejection is measured in a band of ±0.5 Hz around 50 Hz and/or 60 Hz. For all other modes, a region of ±1 Hz around 50 Hz
and/or 60 Hz is used.
4
For output dates rates greater than 1 kHz, the sinc
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1
Output Data
FS[9:0] Rate (Hz)
4
1 4800
5 960
5 960
480 10
480 10
96 50
96 50
96 50
96 50
80 60
80 60
96 12.5
96 12.5
80 15
96 12.5
96 16.7
4
, Chop 96 2.63
4
, Chop 96 2.78
4 , Chop 5 50.53
3
, Chop 5 53.33
4
, Chop 6 42.10
3 6 44.44
, Chop
4
filter is recommended.
Table 36 shows some sample configurations and the
corresponding performance in terms of throughput, settling
time and 50 Hz/60 Hz rejection.
Settling
Time (ms) Throughput 2 (Hz)
0.83 1200
4.17 240
3.125 320
400 2.5
300 3.33
80 12.5
80 12.5
60 16.7
60 16.7
66.67 15
50 20
80 12.5
80 12.5
66.67 15
160 6.25
120 8.33
380 2.63
360 2.78
19.79 50.53
18.75 53.33
23.75 42.1
22.5 44.44
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AD7194
REJ60 50 Hz Rejection (dB)
0 No 50 Hz or 60 Hz rejection
0 No 50 Hz or 60 Hz rejection
0 No 50 Hz or 60 Hz rejection
0 120 dB ( 50 Hz and 60 Hz)
0 100 dB (50 Hz and 60 Hz)
0 120 dB (50 Hz only)
1 82 dB ( 50 Hz and 60 Hz)
0 95 dB (50 Hz only)
1 67 dB ( 50 Hz and 60 Hz)
0 120 dB (60 Hz only)
0 95 dB (60 Hz only)
0 120 dB (50 Hz only)
1 82 dB ( 50 Hz and 60 Hz)
0 120 dB (60 Hz only)
1 80 dB (50 Hz and 60 Hz)
1 67 dB (50 Hz and 60 Hz)
1 100 dB (50 Hz and 60 Hz)
1 94 dB (50 Hz and 60 Hz)
0 40 dB (60 Hz only)
0 40 dB (60 Hz only)
0 40 dB (50 Hz only)
0 40 dB (50 Hz only)
3