ADS131M04-Q1
ZHCSOL7A –MARCH 2022 –REVISED AUGUST 2022
www.ti.com.cn
7 Parameter Measurement Information
7.1 Noise Measurements
Adjust the data rate and gain to optimize the ADS131M04-Q1 noise performance. When averaging is increased
by reducing the data rate, noise drops correspondingly. 表 7-1 summarizes the ADS131M04-Q1 noise
performance using the 1.2-V internal reference and a 3.0-V analog power supply. The data are representative of
typical noise performance at TA = 25°C when fCLKIN = 8.192 MHz. The modulator clock frequency fMOD is equal
to fCLKIN / 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. 表 7-2 shows the dynamic range and effective resolution calculated from the noise
data. 方程式 1 calculates dynamic range. 方程式 2 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 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 applied clock frequency
for the different power modes.
≈
’
VREF
Dynamic Range = 20ìlog
∆
∆
«
÷
÷
2 ìGainì VRMS ◊
(1)
(2)
≈
∆
«
’
÷
2ì VREF
Gainì VRMS ◊
Effective Resolution = log2
表7-1. Noise (μVRMS) at TA = 25°C
GAIN
DATA RATE (kSPS),
OSR
fCLKIN = 8.192 MHz
1
2
4
8
16
32
64
128
0.42
0.57
0.77
1.00
1.20
1.69
2.40
3.42
5.58
16384
8192
4096
2048
1024
512
0.25
0.5
1
1.90
2.39
3.38
4.25
5.35
7.56
10.68
21.31
75.34
1.69
2.13
2.99
3.91
4.68
6.62
9.56
15.26
41.63
1.56
2.13
2.88
3.79
4.52
6.37
9.09
13.52
26.84
0.95
1.29
1.74
2.27
2.70
3.82
5.42
7.89
14.59
0.64
0.86
1.17
1.52
1.82
2.55
3.63
5.21
8.9
0.42
0.57
0.77
1.00
1.20
1.69
2.39
3.41
5.57
0.42
0.57
0.77
1.00
1.20
1.69
2.39
3.42
5.58
2
4
8
256
16
32
64
128
64
表7-2. Dynamic Range (Effective Resolution) at TA = 25°C
GAIN
DATA RATE (kSPS),
fCLKIN = 8.192 MHz
OSR
1
2
4
8
16
32
64
128
16384
8192
4096
2048
1024
512
0.25
0.5
1
113 (20.3) 108 (19.4) 103 (18.6) 101 (18.3) 98 (17.8)
96 (17.5)
93 (17.0)
91 (16.6)
88 (16.2)
87 (15.9)
84 (15.4)
81 (14.9)
78 (14.4)
90 (16.5)
87 (16.0)
85 (15.6)
82 (15.2)
81 (14.9)
78 (14.4)
75 (13.9)
72 (13.4)
84 (15.4)
81 (15.0)
79 (14.6)
76 (14.2)
75 (13.9)
72 (13.4)
69 (12.9)
65 (12.4)
111 (19.9) 106 (19.1) 100 (18.1) 98 (17.8)
96 (17.4)
93 (17.0)
91 (16.6)
89 (16.3)
86 (15.8)
83 (15.3)
80 (14.8)
108 (19.4) 103 (18.6) 97 (17.7)
106 (19.1) 101 (18.2) 95 (17.3)
96 (17.4)
93 (17.0)
92 (16.8)
89 (16.3)
86 (15.8)
83 (15.2)
2
4
104 (18.8) 99 (18.0)
101 (18.3) 96 (17.5)
93 (17.0)
90 (16.5)
87 (16.0)
84 (15.4)
8
256
16
32
98 (17.8)
92 (16.8)
93 (16.9)
89 (16.3)
128
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