MAX11410 Datasheet, PDF (23/95 Pages) Maxim Integrated Products – 24-Bit Multi-Channel Low-Power

MAX11410
24-Bit Multi-Channel Low-Power
1.9ksps Delta-Sigma ADC with PGA
Noise Performance
The input-referred noise depends on the selected data
rate, filter, input signal path (bypass, buffer, or PGA), and
the PGA gain (when selected). This is illustrated in the
tables below. Table 1 shows input-referred noise voltage
(in µV_RMS). Table 2 shows effective resolution, which is
defined as:
Effective Resolution = Log₂(FSR/rms noise), where
FSR is the full-scale input range (5V in bipolar mode with
a 2.5V reference), and
rms noise is the input-referred rms noise.
The third table shows noise-free resolution (NFR), which
is defined as
NFR = Log₂(FSR/p-p noise), where
FSR is the full-scale input range, (5V in bipolar mode with
a 2.5V reference), and
p-p noise is 6.6 times the input-referred rms noise.
Values shown are for continuous conversions. Single-
cycle data rates are similar for the FIR filters, and are one-
fourth the continuous data rate for the SINC4 filter. Note
that higher PGA gain reduces the input-referred noise, but
because the input voltage range is reduced, the effective
resolution decreases.
Table 1. Input-Referred Noise(µV_RMS) with V_REF = 2.5V, AV_DD = 3.3V, and inputs shorted.
FILTER
FIR50/60
FIR50/60
FIR50/60
FIR50/60
FIR50/60
FIR50
FIR50
FIR50
FIR50
FIR50
FIR50
FIR60
FIR60
FIR60
FIR60
FIR60
FIR60
Sinc4
Sinc4
Sinc4
Sinc4
Sinc4
Sinc4
Sinc4
Sinc4
Sinc4
Sinc4
RATE
(SPS)
1
2.1
4.2
8.4
16.8
1.3
2.7
5.3
10.6
21.3
39.9
1.3
2.7
5.3
10.6
21.3
39.9
1.1
2.5
5
10
59.8
119.7
239.4
478.7
957.4
1914.8
BY-
PASS
0.648
3.241
4.398
4.511
4.743
1.716
3.656
4.374
4.469
4.604
4.710
1.721
3.677
4.303
4.663
4.781
4.499
0.399
3.565
4.432
4.542
4.920
2.736
2.762
3.414
4.434
24.496
BUF-
FER
0.681
3.128
4.256
4.428
4.621
1.741
3.640
4.315
4.412
4.511
4.571
1.765
3.719
4.417
4.522
4.672
4.726
0.436
3.573
4.339
4.591
4.508
2.459
3.000
2.766
3.840
24.785
PGA
1X
0.372
3.489
4.758
5.259
5.179
1.589
4.009
4.912
5.306
5.363
5.317
1.470
3.987
4.951
5.174
5.449
5.116
0.156
3.899
4.854
5.192
5.066
3.045
3.366
2.758
4.503
25.092
PGA
2X
0.248
1.747
2.350
2.529
2.575
0.833
2.053
2.480
2.606
2.655
2.633
0.794
1.988
2.473
2.636
2.780
2.711
0.106
1.954
2.435
2.602
2.658
1.553
1.683
1.623
2.462
14.761
PGA
4X
0.095
0.807
1.223
1.326
1.367
0.388
0.983
1.252
1.312
1.351
1.349
0.370
1.030
1.220
1.344
1.336
1.293
0.074
0.982
1.239
1.274
1.284
0.959
0.948
1.023
1.603
5.831
PGA
8X
0.058
0.430
0.599
0.684
0.633
0.169
0.505
0.631
0.647
0.680
0.709
0.160
0.504
0.636
0.632
0.760
0.719
0.062
0.479
0.611
0.664
0.655
0.620
0.596
0.685
1.104
3.855
PGA
16X
0.069
0.187
0.303
0.373
0.399
0.082
0.245
0.312
0.347
0.386
0.449
0.072
0.230
0.309
0.330
0.369
0.456
0.074
0.222
0.305
0.339
0.297
0.367
0.540
0.458
0.774
2.152
PGA
32X
0.067
0.109
0.175
0.218
0.247
0.065
0.119
0.185
0.203
0.230
0.323
0.072
0.147
0.168
0.235
0.268
0.373
0.057
0.111
0.171
0.190
0.281
0.355
0.473
0.562
1.082
1.332
PGA
64X
0.057
0.078
0.108
0.152
0.211
0.068
0.087
0.127
0.151
0.232
0.265
0.056
0.093
0.141
0.190
0.219
0.222
0.040
0.070
0.104
0.135
0.214
0.293
0.383
0.478
0.692
1.115
PGA
128X
0.051
0.057
0.113
0.139
0.188
0.055
0.091
0.121
0.141
0.199
0.291
0.068
0.061
0.121
0.182
0.225
0.290
0.039
0.062
0.079
0.134
0.234
0.276
0.365
0.536
0.725
1.038
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