ADS1291_14 Datasheet, PDF (9/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

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ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
Table 6. Input-Referred Noise (μV_RMS / μV_PP) 5-V Analog Supply and 4.033-V Reference⁽¹⁾
DR BITS
OF
CONFIG1
REGISTER
000
001
010
011
100
101
110
111
OUTPUT
DATA
RATE
(SPS)
125
250
500
1000
2000
4000
8000
NA
–3-dB
BANDWIDTH
(Hz)
32.75
65.5
131
262
524
1048
2096
NA
μV_RMS
0.6
0.9
1.3
2.0
5.1
28.7
149.3
—
PGA GAIN = 3
μV_PP
4.2
SNR
123.4
NOISE-
FREE
BITS
19.28
5.7
120.7
18.82
8.4
117.3
18.27
13.3
113.5
17.62
53
105.3
15.61
307
90.3
13.08
1598
76.0
10.70
—
—
—
ENOB
20.50
20.04
19.49
18.85
17.49
15.00
12.62
—
μV_RMS
0.5
0.7
1.1
1.6
3.9
20.7
111.8
—
PGA GAIN = 4
μV_PP
3.6
SNR
122.3
NOISE-
FREE
BITS
19.08
4.8
119.5
18.66
7.4
116.2
18.04
11.0
112.7
17.48
38
105.2
15.67
222
90.6
13.14
1196
76.0
10.71
—
—
—
ENOB
20.32
19.86
19.31
18.72
17.47
15.06
12.63
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 7. Input-Referred Noise (μV_RMS / μV_PP) 5-V Analog Supply and 4.033-V Reference⁽¹⁾
DR BITS
OF
CONFIG1
REGISTER
000
001
010
011
100
101
110
111
OUTPUT
DATA
RATE
(SPS)
125
250
500
1000
2000
4000
8000
NA
–3-dB
BANDWIDTH
(Hz)
32.75
65.5
131
262
524
1048
2096
NA
μV_RMS
0.5
0.6
0.9
1.4
2.8
13.3
71.5
—
PGA GAIN = 6
μV_PP
3.0
SNR
120.4
NOISE-
FREE
BITS
18.78
4.0
117.5
18.36
6.0
114.3
17.75
8.8
110.8
17.20
24
104.6
15.74
142
91.0
13.20
765
76.4
10.77
—
—
—
ENOB
19.99
19.52
18.99
18.41
17.38
15.12
12.69
—
μV_RMS
0.4
0.6
0.8
1.2
2.3
9.3
52.3
—
PGA GAIN = 8
μV_PP
2.7
SNR
118.5
NOISE-
FREE
BITS
18.48
3.8
115.7
18.01
5.3
112.8
17.53
8.1
109.5
16.92
18
103.6
15.73
100
91.5
13.29
560
76.6
10.80
—
—
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
ENOB
19.68
19.21
18.74
18.19
17.22
15.21
12.72
—
Table 8. Input-Referred Noise (μV_RMS / μV_PP) 5-V Analog Supply and 4.033-V Reference⁽¹⁾
DR BITS
OF
CONFIG1
REGISTER
000
001
010
011
100
101
110
111
OUTPUT
DATA
RATE
(SPS)
125
250
500
1000
2000
4000
8000
NA
–3-dB
BANDWIDTH
(Hz)
32.75
65.5
131
262
524
1048
2096
NA
μV_RMS
0.4
0.5
0.8
1.1
1.9
5.9
33.8
—
PGA GAIN = 12
μV_PP
2.6
SNR
115.7
NOISE-
FREE
BITS
17.96
3.4
112.9
17.59
5.2
109.8
16.96
6.9
106.6
16.56
14
101.9
15.57
63
92.0
13.37
362
76.9
10.85
—
—
—
ENOB
19.21
18.75
18.24
17.70
16.83
15.29
12.77
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
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