ADS1299
SBAS499A –JULY 2012–REVISED AUGUST 2012
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TYPICAL CHARACTERISTICS (continued)
All plots are at TA = +25°C, AVDD = 5 V, AVSS = 0 V, DVDD = 3.3 V, internal VREFP = 4.5 V, VREFN = AVSS, external
clock = 2.048 MHz, data rate = 250 SPS, and gain = 12, unless otherwise noted.
THD vs FREQUENCY
INL vs PGA GAIN
−60
−65
−70
−75
−80
−85
−90
−95
−100
−105
12
10
8
Gain = 1
Data Rate = 8 kSPS
AIN = −0.5 dBFS
Gain = 1
Gain = 2
Gain = 4
Gain = 6
Gain = 8
Gain = 12
Gain = 24
Gain = 2
Gain = 4
Gain = 6
Gain = 8
Gain = 12
Gain = 24
6
4
2
0
−2
−4
−6
−8
−10
10
100
1000
−1 −0.8 −0.6 −0.4 −0.2
0
0.2 0.4 0.6 0.8
1
Frequency (Hz)
Input (Normalized to Full-Scale)
G009
G010
Figure 9.
Figure 10.
THD FFT PLOT
(60-Hz Signal)
INL vs TEMPERATURE
8
6
0
−20
Gain = 12
PGA Gain = 12
THD = −99 dB
SNR = 120 dB
Data Rate = 500 SPS
4
−40
2
−60
0
−80
−2
−4
−6
−8
−10
−100
−120
−140
−160
−180
+25°C
−40°C
+85°C
−1 −0.8 −0.6 −0.4 −0.2
0
0.2 0.4 0.6 0.8
1
0
50
100
150
200
250
Frequency (Hz)
Input Range (Normalized to Full−Scale)
G011
G012
Figure 11.
Figure 12.
FFT PLOT
(60-Hz Signal)
OFFSET vs PGA GAIN
(Absolute Value)
0
−20
600
500
400
300
200
100
0
PGA Gain = 12
THD = −94 dB
SNR = 101 dB
−40
Data Rate = 16 kSPS
−60
−80
−100
−120
−140
−160
−180
0
2000
4000
6000
8000
1
10
30
Frequency (Hz)
PGA Gain
G013
G014
Figure 13.
Figure 14.
12
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