ADS1291
ADS1292
ADS1292R
SBAS502A –DECEMBER 2011–REVISED MARCH 2012
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Table 3. Input-Referred Noise (μVRMS/μVPP) 3-V Analog Supply and 2.42-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
4.1
5.6
8.7
16
SNR
115.9
112.8
109.9
106.8
102.1
91.5
ENOB
19.26
18.73
18.25
17.73
16.96
15.19
12.69
—
μVRMS
0.4
μVPP
2.6
3.9
5.5
7.6
14
SNR
114.0
111.0
108.0
104.9
100.7
91.7
ENOB
18.94
18.44
17.93
17.42
16.72
15.24
12.73
—
000
001
010
011
100
101
110
111
125
250
32.75
65.5
131
18.04
17.58
17.14
16.49
15.64
13.34
10.84
—
17.82
17.22
16.75
16.26
15.36
13.39
10.88
—
0.7
0.6
500
0.9
0.8
1000
2000
4000
8000
NA
262
1.3
1.2
524
2.2
2.0
1048
2096
NA
7.5
77
5.5
56
42.7
—
436
—
76.4
31.3
—
319
—
76.6
—
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 4. Input-Referred Noise (μVRMS/μVPP) 3-V Analog Supply and 2.42-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
2.5
3.5
5.0
6.9
11
SNR
111.3
108.4
105.0
102.1
98.6
92.0
76.9
—
ENOB
18.48
18.01
17.44
16.97
16.38
15.29
12.78
—
000
001
010
011
100
101
110
111
125
250
32.75
65.5
131
17.31
16.81
16.29
15.82
15.21
13.44
10.93
—
0.5
500
0.8
1000
2000
4000
8000
NA
262
1.1
524
1.7
1048
2096
NA
3.5
36
20.1
—
205
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 5. Input-Referred Noise (μVRMS/μVPP) 5-V Analog Supply and 4.033-V Reference(1)
PGA GAIN = 1
PGA GAIN = 2
DR BITS
OF
CONFIG1
REGISTER
OUTPUT
DATA
RATE
–3-dB
BANDWIDTH
(Hz)
NOISE-
FREE
BITS
NOISE-
FREE
BITS
(SPS)
μVRMS
1.6
μVPP
10.2
13.3
18.9
31.9
167
SNR
124.9
122.3
119.3
115.2
105.2
90.0
ENOB
20.75
20.31
19.82
19.14
17.48
14.95
12.59
—
μVRMS
0.9
μVPP
5.4
SNR
124.3
121.3
118.2
114.4
105.5
89.9
ENOB
20.65
20.15
19.63
19.00
17.53
14.94
12.59
—
000
001
010
011
100
101
110
111
125
250
32.75
65.5
131
19.58
19.20
18.69
17.94
15.55
13.03
10.67
—
19.50
18.91
18.52
17.77
15.62
13.02
10.67
—
2.2
1.2
8.1
500
3.1
1.7
10.6
17.9
80
1000
2000
4000
8000
NA
262
4.9
2.7
524
15.5
89.6
460.1
—
7.5
1048
2096
NA
959
45.0
229.0
—
481
2450
—
4923
—
75.8
75.8
—
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
8
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