ADS1291
ADS1292
ADS1292R
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SBAS502A –DECEMBER 2011–REVISED MARCH 2012
Table 6. Input-Referred Noise (μVRMS/μVPP) 5-V Analog Supply and 4.033-V Reference(1)
PGA GAIN = 3
PGA GAIN = 4
DR BITS
OF
CONFIG1
REGISTER
OUTPUT
DATA
RATE
–3-dB
BANDWIDTH
(Hz)
NOISE-
FREE
BITS
NOISE-
FREE
BITS
(SPS)
μVRMS
0.6
μVPP
4.2
SNR
123.4
120.7
117.3
113.5
105.3
90.3
ENOB
20.50
20.04
19.49
18.85
17.49
15.00
12.62
—
μVRMS
0.5
μVPP
3.6
SNR
122.3
119.5
116.2
112.7
105.2
90.6
ENOB
20.32
19.86
19.31
18.72
17.47
15.06
12.63
—
000
001
010
011
100
101
110
111
125
250
32.75
65.5
131
19.28
18.82
18.27
17.62
15.61
13.08
10.70
—
19.08
18.66
18.04
17.48
15.67
13.14
10.71
—
0.9
5.7
0.7
4.8
500
1.3
8.4
1.1
7.4
1000
2000
4000
8000
NA
262
2.0
13.3
53
1.6
11.0
38
524
5.1
3.9
1048
2096
NA
28.7
149.3
—
307
1598
—
20.7
111.8
—
222
1196
—
76.0
76.0
—
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 7. Input-Referred Noise (μVRMS/μVPP) 5-V Analog Supply and 4.033-V Reference(1)
PGA GAIN = 6
PGA GAIN = 8
DR BITS
OF
CONFIG1
REGISTER
OUTPUT
DATA
RATE
–3-dB
BANDWIDTH
(Hz)
NOISE-
FREE
BITS
NOISE-
FREE
BITS
(SPS)
μVRMS
0.5
μVPP
3.0
4.0
6.0
8.8
24
SNR
120.4
117.5
114.3
110.8
104.6
91.0
ENOB
19.99
19.52
18.99
18.41
17.38
15.12
12.69
—
μVRMS
0.4
μVPP
2.7
3.8
5.3
8.1
18
SNR
118.5
115.7
112.8
109.5
103.6
91.5
ENOB
19.68
19.21
18.74
18.19
17.22
15.21
12.72
—
000
001
010
011
100
101
110
111
125
250
32.75
65.5
131
18.78
18.36
17.75
17.20
15.74
13.20
10.77
—
18.48
18.01
17.53
16.92
15.73
13.29
10.80
—
0.6
0.6
500
0.9
0.8
1000
2000
4000
8000
NA
262
1.4
1.2
524
2.8
2.3
1048
2096
NA
13.3
71.5
—
142
765
—
9.3
100
560
—
76.4
52.3
—
76.6
—
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 8. Input-Referred Noise (μVRMS/μVPP) 5-V Analog Supply and 4.033-V Reference(1)
PGA GAIN = 12
OUTPUT
DR BITS
OF
CONFIG1
REGISTER
DATA
RATE
(SPS)
–3-dB
BANDWIDTH
(Hz)
NOISE-
FREE
BITS
μVRMS
0.4
μVPP
2.6
3.4
5.2
6.9
14
SNR
115.7
112.9
109.8
106.6
101.9
92.0
ENOB
19.21
18.75
18.24
17.70
16.83
15.29
12.77
—
000
001
010
011
100
101
110
111
125
250
32.75
65.5
131
17.96
17.59
16.96
16.56
15.57
13.37
10.85
—
0.5
500
0.8
1000
2000
4000
8000
NA
262
1.1
524
1.9
1048
2096
NA
5.9
63
33.8
—
362
—
76.9
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
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