ADS1291_14 Datasheet, PDF (13/75 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
TYPICAL CHARACTERISTICS
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.
4
3
2
1
0
−1
−2
−3
−4
0
INPUT-REFERRED NOISE
Peak−to−Peak Over 10 seconds = 8 µV
2
4
6
8
10
Time (sec)
G001
Figure 2.
1200
1000
800
600
400
200
0
NOISE HISTOGRAM
Input−Referred Noise (µV)
G002
Figure 3.
INTERNAL REFERENCE vs TEMPERATURE
2.424
2.422
2.42
2.418
2.416
−40
−15
10
35
60
85
Temperature (°C)
G003
Figure 4.
−95
−100
CMRR vs FREQUENCY
Data Rate = 8 kSPS
AIN = AVDD − 0.3 V to AVSS + 0.3 V
−105
−110
−115
−120
−125
−130
−135
10
100
Frequency (Hz)
Figure 5.
Gain = 1
Gain = 2
Gain = 3
Gain = 4
Gain = 6
Gain = 8
Gain = 12
1k
G004
LEAKAGE CURRENT vs INPUT VOLTAGE
0.7
0.6
0.5
64 kHz Chop Rate
0.4
32 kHz Chop Rate
0.3
0.2
8 kHz Chop Rate
0.1
0
0
0.5
1
1.5
2
2.5
3
Input Signal (V)
G030
Figure 6.
LEAKAGE CURRENT vs TEMPERATURE
2.5
AVDD = 3 V, Chop = 8 k
AVDD = 3 V, Chop = 32 k
2
AVDD = 3 V, Chop = 64 k
AVDD = 5 V, Chop = 8 k
AVDD = 5 V, Chop = 32 k
1.5
AVDD = 5 V, Chop =64 k
1
0.5
0
−40
−15
10
35
60
85
Temperature (°C)
G006
Figure 7.
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