AD7194 Analog Devices, AD7194 Datasheet - Page 51

• Manufacturer Part Number: AD7194
• Description: 8-Channel, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA
• Manufacturer: Analog Devices

Specifications of AD7194

• Resolution (bits): 24bit
• # Chan: 8
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

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
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Sinc
Fast Settling (Sinc
Fast Settling (Sinc
Fast Settling (Sinc
Fast Settling (Sinc
Fast Settling (Sinc
Fast Settling (Sinc
1
2
3
4
These calculations assume a 4.92 MHz stable master clock.
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.
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.
For output dates rates greater than 1 kHz, the sinc
Latency
Latency
Latency
Disabled, Average by 16)
Disabled, Average by 16)
Disabled, Average by 16)
Disabled, Average by 16)
Disabled, Average by 16)
Disabled, Average by 16)
4
4
3
4
3
4
4
3
3
4
3
4
4
4
4
3
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled
, Chop Disabled, Zero
, Chop Disabled, Zero
, Chop Disabled, Zero
, Chop Enabled
, Chop Enabled
4
4
4
3
4
3
, Chop
, Chop
, Chop
, Chop
, Chop
, Chop
4
1
FS[9:0]
1
5
5
480
480
96
96
96
96
80
80
96
96
80
96
96
96
96
5
5
6
6
Output Data
Rate (Hz)
4800
960
960
10
10
50
50
50
50
60
60
12.5
12.5
15
12.5
16.7
2.63
2.78
50.53
53.33
42.10
44.44
4
filter is recommended.
Settling
Time (ms)
0.83
4.17
3.125
400
300
80
80
60
60
66.67
50
80
80
66.67
160
120
380
360
19.79
18.75
23.75
22.5
Rev. 0 | Page 51 of 56
Table 36 shows some sample configurations and the
corresponding performance in terms of throughput, settling
time and 50 Hz/60 Hz rejection.
Throughput
1200
240
320
2.5
3.33
12.5
12.5
16.7
16.7
15
20
12.5
12.5
15
6.25
8.33
2.63
2.78
50.53
53.33
42.1
44.44
2
(Hz)
REJ60
0
0
0
0
0
0
1
0
1
0
0
0
1
0
1
1
1
1
0
0
0
0
50 Hz Rejection (dB)
No 50 Hz or 60 Hz rejection
120 dB ( 50 Hz and 60 Hz)
100 dB (50 Hz and 60 Hz)
82 dB ( 50 Hz and 60 Hz)
95 dB (50 Hz only)
67 dB ( 50 Hz and 60 Hz)
95 dB (60 Hz only)
82 dB ( 50 Hz and 60 Hz)
100 dB (50 Hz and 60 Hz)
94 dB (50 Hz and 60 Hz)
40 dB (60 Hz only)
40 dB (60 Hz only)
40 dB (50 Hz only)
40 dB (50 Hz only)
No 50 Hz or 60 Hz rejection
No 50 Hz or 60 Hz rejection
120 dB (50 Hz only)
120 dB (60 Hz only)
120 dB (50 Hz only)
120 dB (60 Hz only)
80 dB (50 Hz and 60 Hz)
67 dB (50 Hz and 60 Hz)
AD7194
3