ADS131B04-Q1
ZHCSMK3B –NOVEMBER 2020 –REVISED NOVEMBER 2021
www.ti.com.cn
7 Parameter Measurement Information
7.1 Noise Measurements
Adjust the data rate and gain to optimize the ADS131B04-Q1 noise performance. When averaging is increased
by reducing the data rate, noise drops correspondingly. 表 7-1 summarizes the ADS131B04-Q1 noise
performance using the 1.2-V internal reference and a 3.3-V analog power supply. The data are representative of
typical noise performance at TA = 25°C when fMCLK = 8.192 MHz. The modulator clock frequency fMOD = fMCLK
/
2. The data shown are typical input-referred noise results with the analog inputs shorted together and taking an
average of multiple readings across all channels. A minimum 1 second of consecutive readings are used to
calculate the RMS noise for each reading. 表 7-2 shows the effective resolution calculated from the noise data.
方程式 1 calculates effective resolution. In each case, VREF corresponds to the internal 1.2-V reference. In
global-chop mode, noise is improved by a factor of √2.
The noise performance scales with the oversampling rate (OSR) and gain settings, but is independent from the
configured power mode. Thus, the device exhibits the same noise performance in different power modes when
selecting the same OSR and gain settings. However, the data rate at the OSR settings scales based on the main
clock frequency for the different power modes.
≈
∆
«
’
÷
2ì VREF
Gainì VRMS ◊
Effective Resolution = log2
(1)
表7-1. Noise (μVRMS) at TA = 25°C
GAIN
DATA RATE (kSPS),
OSR
fMCLK = 8.192 MHz
1
2
4
8
16
32
64
128
0.42
0.58
0.80
1.05
1.27
1.80
2.53
3.63
16384
8192
4096
2048
1024
512
0.25
0.5
1
1.78
2.51
3.41
4.54
5.42
8.15
13.02
23.12
1.59
2.19
2.97
3.96
4.74
6.91
10.33
16.45
1.58
2.07
2.84
3.76
4.52
6.50
9.37
13.64
0.44
0.60
0.82
1.07
1.29
1.82
2.61
4.02
0.43
0.59
0.81
1.06
1.28
1.81
2.56
3.73
0.42
0.58
0.80
1.05
1.27
1.80
2.53
3.63
0.42
0.58
0.80
1.05
1.27
1.80
2.53
3.63
2
4
8
256
16
32
128
表7-2. Effective Resolution at TA = 25°C
GAIN
DATA RATE (kSPS),
fMCLK = 8.192 MHz
OSR
1
2
4
8
16
32
64
128
15.4
15.0
14.5
14.1
13.8
13.3
12.9
12.3
16384
8192
4096
2048
1024
512
0.25
0.5
1
20.4
19.9
19.4
19.0
18.8
18.2
17.5
16.7
19.5
19.1
18.6
18.2
17.9
17.4
16.8
16.2
18.5
18.1
17.7
17.3
17.0
16.5
16.0
15.4
19.4
18.9
18.5
18.1
17.8
17.3
16.8
16.2
18.4
18.0
17.5
17.1
16.8
16.3
15.8
15.3
17.4
17.0
16.5
16.1
15.8
15.3
14.9
14.3
16.4
16.0
15.5
15.1
14.8
14.3
13.9
13.3
2
4
8
256
16
32
128
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