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RMS NOISE AND RESOLUTION
The following tables show the rms noise, peak-to-peak noise,
effective resolution, and noise-free (peak-to-peak) resolution of
the AD7194 for various output data rates and gain settings with
chop disabled for the sinc
mode. The numbers given are for the bipolar input range with
an external 5 V reference. These numbers are typical and are
generated with a differential input voltage of 0 V when the ADC
4
SINC
CHOP DISABLED
Table 6. RMS Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
1023
640
480
96
80
32
16
5
2
1
Table 7. Peak-to-Peak Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
1023
640
480
96
80
32
16
5
2
1
Table 8. Effective Resolution (Peak-to-Peak Resolution) vs. Gain and Output Data Rate
Filter Word
Output Data
(Decimal)
Rate (Hz)
1023
4.7
640
7.5
480
10
96
50
80
60
32
150
16
300
5
960
2
2400
1
4800
1
The output peak-to-peak (p-p) resolution is listed in parentheses.
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4
3
and sinc
filters and for fast settling
Output Data
Settling
Rate (Hz)
Time (ms)
4.7
852.5
7.5
533
10
400
50
80
60
66.7
150
26.7
300
13.3
960
4.17
2400
1.67
4800
0.83
Output Data
Settling
Rate (Hz)
Time (ms)
4.7
852.5
7.5
533
10
400
50
80
60
66.7
150
26.7
300
13.3
960
4.17
2400
1.67
4800
0.83
Settling
Time (ms)
1
852.5
24 (22.1)
533
24 (21.8)
400
24 (21.7)
80
23.1 (20.5)
66.7
23 (20.4)
26.7
22.4 (19.8)
13.3
21.9 (19.2)
4.17
21.1 (18.4)
1.67
20.4 (17.6)
0.83
18.6 (15.8)
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. With chop
enabled, the resolution improves by 0.5 bits.
1
8
16
370
57
35
440
73
41
470
83
45
1100
150
85
1200
170
94
1800
260
150
2500
360
210
4500
640
370
7500
1100
600
26,000
3400
1800
1
8
16
2200
340
200
2700
430
260
3000
480
300
6600
950
540
7200
1000
610
11,000
1600
970
17,000
2400
1400
35,000
4800
2500
56,000
7500
4200
175,000
23,000
12,000
Gain of
8
16
24 (21.8)
24 (21.6)
24 (21.5)
23.9 (21.2)
24 (21.3)
23.7 (21)
23 (20.3)
22.8 (20.1)
22.9 (20.3)
22.7 (20)
22.3 (19.6)
22 (19.3)
21.8 (19)
21.5 (18.8)
21 (18)
20.7 (17.9)
20.3 (17.3)
20 (17.2)
18.5 (15.7)
18.4 (15.7)
Rev. 0 | Page 15 of 56
Gain of
32
64
18
13
24
17
28
18
52
38
56
42
86
65
130
95
230
170
380
280
940
550
Gain of
32
64
120
84
150
100
170
120
350
250
370
270
580
430
840
620
1500
1100
2900
1800
7100
3600
1
32
64
24 (21.3)
23.5 (20.8)
23.6 (21)
23.1 (20.6)
23.4 (20.8)
23 (20.3)
22.5 (19.8)
22 (19.3)
22.4 (19.7)
21.8 (19.1)
21.8 (19)
21.2 (18.5)
21.2 (18.5)
20.7 (17.9)
20.4 (17.7)
19.8 (17.1)
19.6 (16.7)
19.1 (16.4)
18.3 (15.4)
18.1 (15.4)
AD7194
128
11
13
16
34
38
59
83
150
240
390
128
70
85
100
210
220
370
530
1000
1700
2600
128
22.8 (20.1)
22.5 (19.8)
22.2 (19.6)
21.1 (18.5)
21 (18.4)
20.3 (17.7)
19.8 (17.2)
19 (16.3)
18.3 (15.5)
17.6 (14.9)
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