ADS1291
ADS1292
ADS1292R
SBAS502A –DECEMBER 2011–REVISED MARCH 2012
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TYPICAL CHARACTERISTICS (continued)
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.
PSRR vs FREQUENCY
THD vs FREQUENCY
120
110
100
90
−55
−65
Data Rate = 8 kSPS, −0.5 dBFS
Data Rate = 8 kSPS, −0.5 dBFS
−75
−85
Gain = 1
Gain = 2
Gain = 3
Gain = 4
Gain = 6
Gain = 8
Gain = 12
80
−95
70
−105
−115
−125
Gain = 1
Gain = 2
Gain = 3
Gain = 4
Gain = 6
Gain = 8
Gain = 12
60
50
10
100
1k
10
100
1k
Frequency (Hz)
Frequency (Hz)
G007
G008
Figure 8.
Figure 9.
INL vs PGA GAIN
INL vs TEMPERATURE
4
3
2
1
0
4
2
0
−2
−4
−40 °C
−20 °C
0 °C
40 °C
50 °C
70 °C
85 °C
25 °C
2
4
6
8
10
12
−1
−0.5
0
0.5
1
PGA Gain
Input Range (Normalized to Full−Scale)
G009
G010
Figure 10.
Figure 11.
THD FFT PLOT
(60-Hz Signal)
FFT PLOT
(60-Hz Signal)
0
−20
0
−20
PGA Gain = 1
Input = 10Hz, −0.5 dBFS
THD = −103 dB
PGA Gain = 1
Input = 10Hz, −0.5 dBFS
THD = −101 dB
SNR = 80 dB
−40
−40
SNR =117 dB
−60
Data Rate =500 sps
Data Rate = 8 ksps
−60
−80
−80
−100
−120
−140
−160
−180
−100
−120
−140
−160
0
50
100
150
200
250
0
1000
2000
3000
4000
Frequency (Hz)
Frequency (Hz)
G011
G012
Figure 12.
Figure 13.
14
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