Datasheet

ADS1255
ADS1256
SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
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13
Table 4. Input Referred Noise (μV, rms)
with Buffer Off
DATA
RATE
PGA
RATE
(SPS)
1 2 4 8 16 32 64
2.5 0.247 0.149 0.097 0.058 0.036 0.031 0.027
5 0.275 0.176 0.109 0.070 0.046 0.039 0.038
10 0.338 0.201 0.129 0.084 0.063 0.048 0.047
15 0.401 0.221 0.150 0.109 0.070 0.063 0.057
25 0.485 0.279 0.177 0.136 0.093 0.076 0.076
30 0.559 0.315 0.202 0.142 0.107 0.093 0.082
50 0.644 0.390 0.238 0.187 0.129 0.108 0.103
60 0.688 0.417 0.281 0.204 0.134 0.109 0.111
100 0.815 0.530 0.360 0.233 0.169 0.123 0.122
500 1.957 1.148 0.772 0.531 0.375 0.276 0.259
1000 2.803 1.797 1.191 0.940 0.518 0.392 0.365
2000 4.025 2.444 1.615 1.310 0.700 0.526 0.461
3750 5.413 3.250 2.061 1.578 0.914 0.693 0.625
7500 7.017 4.143 2.722 1.998 1.241 0.914 0.857
15,000 8.862 5.432 3.378 2.411 1.569 1.149 1.051
30,000 10.341 6.137 3.873 2.775 1.805 1.313 1.211
Table 5. Effective Number of Bits (ENOB, rms)
with Buffer Off
DATA
RATE
PGA
RATE
(SPS)
1 2 4 8 16 32 64
2.5 25.3 25.0 24.6 24.4 24.0 23.2 22.5
5 25.1 24.8 24.5 24.1 23.7 22.9 22.0
10 24.8 24.6 24.2 23.8 23.2 22.6 21.7
15 24.6 24.4 24.0 23.4 23.1 22.2 21.4
25 24.3 24.1 23.8 23.1 22.7 22.0 21.0
30 24.1 23.9 23.6 23.1 22.5 21.7 20.9
50 23.9 23.6 23.3 22.7 22.2 21.5 20.5
60 23.8 23.5 23.1 22.5 22.1 21.5 20.4
100 23.5 23.2 22.7 22.4 21.8 21.3 20.3
500 22.3 22.1 21.6 21.2 20.7 20.1 19.2
1000 21.8 21.4 21.0 20.3 20.2 19.6 18.7
2000 21.2 21.0 20.6 19.9 19.8 19.2 18.4
3750 20.8 20.6 20.2 19.6 19.4 18.8 17.9
7500 20.4 20.2 19.8 19.3 18.9 18.4 17.5
15,000 20.1 19.8 19.5 19.0 18.6 18.1 17.2
30,000 19.9 19.6 19.3 18.8 18.4 17.9 17.0
Table 6. Noise-Free Resolution (bits)
with Buffer Off
DATA
RATE
PGA
RATE
(SPS)
1 2 4 8 16 32 64
2.5 23.0 22.4 22.0 21.9 21.3 21.1 20.0
5 22.4 22.1 21.9 21.5 21.2 20.4 19.4
10 22.3 22.1 21.7 21.5 20.8 20.3 19.2
15 22.0 21.8 21.4 20.8 20.6 19.9 19.0
25 21.8 21.7 21.1 20.7 20.3 19.5 18.6
30 21.6 21.4 21.1 20.4 20.0 16.4 18.5
50 21.3 21.3 20.7 20.1 19.8 19.1 18.2
60 21.2 21.0 20.6 20.1 19.8 19.1 18.1
100 21.1 20.5 20.3 19.9 19.5 19.0 17.9
500 20.0 19.7 19.3 18.9 18.3 17.8 16.9
1000 19.0 18.7 18.4 17.7 17.5 16.9 15.9
2000 18.5 18.3 17.9 17.4 17.0 16.4 15.6
3750 18.1 17.8 17.5 17.0 16.7 16.1 15.2
7500 17.7 17.6 17.0 16.6 16.2 15.7 14.8
15,000 17.4 17.1 16.8 16.3 15.9 15.3 14.4
30,000 17.1 17.0 16.6 16.0 15.6 15.0 14.4