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AD7195 Datasheet(PDF) 13 Page - Analog Devices

Part # AD7195
Description  4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA and AC Excitation
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7195 Datasheet(HTML) 13 Page - Analog Devices

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AD7195
Rev. 0 | Page 13 of 44
RMS NOISE AND RESOLUTION
The tables in this section show the rms noise, peak-to-peak
noise, effective resolution, and noise-free (peak-to-peak) resolu-
tion of the AD7195 for various output data rates and gain settings,
with chop disabled and chop enabled for the sinc4 and sinc3
filters. The numbers given are for the bipolar input range with
the external 5 V reference. These numbers are typical and are
generated with a differential input voltage of 0 V when the ADC
is continuously converting on a single channel. It is important
to note that the effective resolution is calculated using the rms
noise, whereas the peak-to-peak resolution is calculated based
on peak-to-peak noise. The peak-to-peak resolution represents
the resolution for which there is no code flicker.
SINC4 CHOP DISABLED
Table 6. RMS Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
Output Data
Rate (Hz)
Settling
Time (ms)
Gain of 1
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
1023
4.7
852.5
280
96
50
22
10
8.5
640
7.5
533
390
120
54
28
12
10.5
480
10
400
470
130
56
31
14
11.5
96
50
80
1000
150
78
45
33
28
80
60
66.7
1100
170
88
52
36
31
32
150
26.7
1460
220
125
75
55
48
16
300
13.3
1900
285
170
100
75
67
5
960
4.17
3000
480
280
175
140
121
2
2400
1.67
5000
780
440
280
220
198
1
4800
0.83
14,300
1920
1000
550
380
295
Table 7. Peak-to-Peak Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
Output Data
Rate (Hz)
Settling
Time (ms)
Gain of 1
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
1023
4.7
852.5
1600
500
250
130
65
56
640
7.5
533
2200
650
290
150
80
65
480
10
400
3000
670
300
190
100
70
96
50
80
6000
900
450
280
180
170
80
60
66.7
7200
1100
480
300
220
190
32
150
26.7
8300
1500
750
410
340
310
16
300
13.3
11,000
1700
1000
600
440
430
5
960
4.17
20,000
3000
1800
1100
810
710
2
2400
1.67
32,000
5100
2800
1700
1400
1200
1
4800
0.83
86,000
13,000
6000
3500
2400
1900
Table 8. Effective Resolution (Peak-to-Peak Resolution) vs. Gain and Output Data Rate
Filter Word
(Decimal)
Output Data
Rate (Hz)
Settling
Time (ms)
Gain of 11
Gain of 81
Gain of 161
Gain of 321
Gain of 641
Gain of 1281
1023
4.7
852.5
24 (22.6)
23.6 (21.3)
23.6 (21.3)
23.6 (21.2)
23.6 (21.2)
23.1 (20.4)
640
7.5
533
24 (22.1)
23.4 (20.9)
23.4 (20.9)
23.4 (20.9)
23.4 (20.9)
22.8 (20.2)
480
10
400
24 (21.7)
23.3 (20.8)
23.3 (20.8)
23.3 (20.8)
23.3 (20.6)
22.7 (20.1)
96
50
80
23.3 (20.7)
23 (20.4)
22.9 (20.4)
22.7 (20.1)
22.2 (19.7)
21.4 (18.8)
80
60
66.7
23.1 (20.4)
22.8 (20.1)
22.8 (20)
22.5 (20 )
22.1 (19.4)
21.3 (18.6)
32
150
26.7
22.7 (20.2)
22.4 (19.7)
22.3 (19.7)
22 (19.5)
21.5 (18.8)
20.6 (17.9)
16
300
13.3
22.3 (19.8)
22.1 (19.5)
21.8 (19.3)
21.6 (19)
21 (18.4)
20.1 (17.5)
5
960
4.17
21.7 (18.9)
21.3 (18.7)
21.1 (18.4)
20.8 (18.1)
20.2 (17.6)
19.3 (16.7)
2
2400
1.67
20.9 (18.3)
20.6 (17.9)
20.4 (17.7)
20.1 (17.5)
19.5 (16.8)
18.6 (16)
1
4800
0.83
19.4 (16.8)
19.3 (16.6)
19.3 (16.4)
19.1 (16.4)
18.8 (16)
18 (15.3)
1 The output peak-to-peak (p-p) resolution is listed in parentheses.



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