ADS1291_14 Datasheet, PDF (14/75 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
TYPICAL CHARACTERISTICS (continued)
At T_A = +25°C, AVDD = 3 V, AVSS = 0 V, DVDD = 1.8 V, internal VREFP = 2.42 V, VREFN = AVSS, external clock =
512 kHz, data rate = 500 SPS, C_FILTER = 4.7 nF, and gain = 6, unless otherwise noted.
PSRR vs FREQUENCY
THD vs FREQUENCY
120
−55
Data Rate = 8 kSPS, −0.5 dBFS
Data Rate = 8 kSPS, −0.5 dBFS
110
−65
100
−75
90
80
70
60
50
10
Gain = 1
Gain = 2
Gain = 3
Gain = 4
Gain = 6
Gain = 8
Gain = 12
100
Frequency (Hz)
Figure 8.
−85
−95
−105
−115
1k
G007
−125
10
100
Frequency (Hz)
Figure 9.
Gain = 1
Gain = 2
Gain = 3
Gain = 4
Gain = 6
Gain = 8
Gain = 12
1k
G008
INL vs PGA GAIN
4
INL vs TEMPERATURE
4
3
2
1
0
2
4
6
8
PGA Gain
Figure 10.
10
12
G009
0
−20
−40
−60
−80
−100
−120
−140
−160
−180
0
THD FFT PLOT
(60-Hz Signal)
PGA Gain = 1
Input = 10Hz, −0.5 dBFS
THD = −103 dB
SNR =117 dB
Data Rate =500 sps
50
100
150
200
250
Frequency (Hz)
G011
Figure 12.
2
0
−2
−4
−1
0
−20
−40
−60
−80
−100
−120
−140
−160
0
−40 °C
−20 °C
0 °C
25 °C
40 °C
50 °C
70 °C
85 °C
−0.5
0
0.5
1
Input Range (Normalized to Full−Scale)
G010
Figure 11.
FFT PLOT
(60-Hz Signal)
PGA Gain = 1
Input = 10Hz, −0.5 dBFS
THD = −101 dB
SNR = 80 dB
Data Rate = 8 ksps
1000
2000
Frequency (Hz)
Figure 13.
3000
4000
G012
14
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