ADS1291
ADS1292
ADS1292R
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SBAS502A –DECEMBER 2011–REVISED MARCH 2012
TYPICAL CHARACTERISTICS
At TA = +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, CFILTER = 4.7 nF, and gain = 6, unless otherwise noted.
INPUT-REFERRED NOISE
NOISE HISTOGRAM
4
3
1200
1000
800
600
400
200
0
2
1
0
−1
−2
−3
−4
Peak−to−Peak Over 10 seconds = 8 µV
0
2
4
6
8
10
Time (sec)
G001
Input−Referred Noise (µV)
G002
Figure 2.
Figure 3.
INTERNAL REFERENCE vs TEMPERATURE
CMRR vs FREQUENCY
2.424
2.422
2.42
−95
−100
−105
−110
−115
−120
−125
−130
−135
Data Rate = 8 kSPS
AIN = AVDD − 0.3 V to AVSS + 0.3 V
Gain = 1
Gain = 2
Gain = 3
Gain = 4
Gain = 6
Gain = 8
Gain = 12
2.418
2.416
−40
−15
10
35
60
85
10
100
1k
Temperature (°C)
Frequency (Hz)
G003
G004
Figure 4.
Figure 5.
LEAKAGE CURRENT vs INPUT VOLTAGE
LEAKAGE CURRENT vs TEMPERATURE
0.7
2.5
2
AVDD = 3 V, Chop = 8 k
AVDD = 3 V, Chop = 32 k
AVDD = 3 V, Chop = 64 k
AVDD = 5 V, Chop = 8 k
AVDD = 5 V, Chop = 32 k
AVDD = 5 V, Chop =64 k
0.6
0.5
0.4
0.3
0.2
0.1
0
64 kHz Chop Rate
32 kHz Chop Rate
1.5
1
8 kHz Chop Rate
0.5
0
0
0.5
1
1.5
2
2.5
3
−40
−15
10
35
60
85
Input Signal (V)
Temperature (°C)
G030
G006
Figure 6.
Figure 7.
Copyright © 2011–2012, Texas Instruments Incorporated
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