ADS1291_14 Datasheet, PDF (8/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
www.ti.com
Table 3. Input-Referred Noise (μV_RMS / μV_PP) 3-V Analog Supply and 2.42-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
0.7
0.9
1.3
2.2
7.5
42.7
—
PGA GAIN = 6
μV_PP
3.0
SNR
115.9
NOISE-
FREE
BITS
18.04
4.1
112.8
17.58
5.6
109.9
17.14
8.7
106.8
16.49
16
102.1
15.64
77
91.5
13.34
436
76.4
10.84
—
—
—
ENOB
19.26
18.73
18.25
17.73
16.96
15.19
12.69
—
μV_RMS
0.4
0.6
0.8
1.2
2.0
5.5
31.3
—
PGA GAIN = 8
μV_PP
2.6
SNR
114.0
NOISE-
FREE
BITS
17.82
3.9
111.0
17.22
5.5
108.0
16.75
7.6
104.9
16.26
14
100.7
15.36
56
91.7
13.39
319
76.6
10.88
—
—
—
ENOB
18.94
18.44
17.93
17.42
16.72
15.24
12.73
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 4. Input-Referred Noise (μV_RMS / μV_PP) 3-V Analog Supply and 2.42-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
1.7
3.5
20.1
—
PGA GAIN = 12
μV_PP
2.5
SNR
111.3
NOISE-
FREE
BITS
17.31
3.5
108.4
16.81
5.0
105.0
16.29
6.9
102.1
15.82
11
98.6
15.21
36
92.0
13.44
205
76.9
10.93
—
—
—
ENOB
18.48
18.01
17.44
16.97
16.38
15.29
12.78
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
Table 5. 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
1.6
2.2
3.1
4.9
15.5
89.6
460.1
—
PGA GAIN = 1
μV_PP
10.2
SNR
124.9
NOISE-
FREE
BITS
19.58
13.3
122.3
19.20
18.9
119.3
18.69
31.9
115.2
17.94
167
105.2
15.55
959
90.0
13.03
4923
75.8
10.67
—
—
—
ENOB
20.75
20.31
19.82
19.14
17.48
14.95
12.59
—
μV_RMS
0.9
1.2
1.7
2.7
7.5
45.0
229.0
—
PGA GAIN = 2
μV_PP
5.4
SNR
124.3
NOISE-
FREE
BITS
19.50
8.1
121.3
18.91
10.6
118.2
18.52
17.9
114.4
17.77
80
105.5
15.62
481
89.9
13.02
2450
75.8
10.67
—
—
—
(1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table.
ENOB
20.65
20.15
19.63
19.00
17.53
14.94
12.59
—
8
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