7 Parameter Measurement Information
7.1 Noise Measurements
Adjust the data rate and gain to optimize the ADS131M06-Q1 noise performance. When averaging is increased
by reducing the data rate, noise drops correspondingly.
表 7-1 summarizes the ADS131M06-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 T
A
= 25°C when f
CLKIN
= 8.192 MHz. The modulator clock frequency f
MOD
is equal
to f
CLKIN
/ 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, V
REF
corresponds to the internal 1.2-V reference, or the voltage on the REFIN pin if the external reference is used. 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.
REF
RMS
V
Dynamic Range = 20 log
2 Gain V
§ ·
u
¨ ¸
¨ ¸
u u
© ¹
(1)
REF
2
RMS
2 V
Effective Resolution = log
Gain V
§ ·
u
¨ ¸
u
© ¹
(2)
表 7-1. Noise (μV
RMS
) at T
A
= 25°C
OSR
DATA RATE (kSPS),
f
CLKIN
= 8.192 MHz
GAIN
1 2 4 8 16 32 64 128
16384 0.25 1.90 1.69 1.56 0.95 0.64 0.42 0.42 0.42
8192 0.5 2.39 2.13 2.13 1.29 0.86 0.57 0.57 0.57
4096 1 3.38 2.99 2.88 1.74 1.17 0.77 0.77 0.77
2048 2 4.25 3.91 3.79 2.27 1.52 1.00 1.00 1.00
1024 4 5.35 4.68 4.52 2.70 1.82 1.20 1.20 1.20
512 8 7.56 6.62 6.37 3.82 2.55 1.69 1.69 1.69
256 16 10.68 9.56 9.09 5.42 3.63 2.39 2.39 2.40
128 32 21.31 15.26 13.52 7.89 5.21 3.41 3.42 3.42
表 7-2. Dynamic Range (Effective Resolution) at T
A
= 25°C
OSR
DATA RATE (kSPS),
f
CLKIN
= 8.192 MHz
GAIN
1 2 4 8 16 32 64 128
16384 0.25 113 (20.3) 108 (19.4) 103 (18.6) 101 (18.3) 98 (17.8) 96 (17.5) 90 (16.5) 84 (15.4)
8192 0.5 111 (19.9) 106 (19.1) 100 (18.1) 98 (17.8) 96 (17.4) 93 (17.0) 87 (16.0) 81 (15.0)
4096 1 108 (19.4) 103 (18.6) 97 (17.7) 96 (17.4) 93 (17.0) 91 (16.6) 85 (15.6) 79 (14.6)
2048 2 106 (19.1) 101 (18.2) 95 (17.3) 93 (17.0) 91 (16.6) 88 (16.2) 82 (15.2) 76 (14.2)
1024 4 104 (18.8) 99 (18.0) 93 (17.0) 92 (16.8) 89 (16.3) 87 (15.9) 81 (14.9) 75 (13.9)
512 8 101 (18.3) 96 (17.5) 90 (16.5) 89 (16.3) 86 (15.8) 84 (15.4) 78 (14.4) 72 (13.4)
256 16 98 (17.8) 93 (16.9) 87 (16.0) 86 (15.8) 83 (15.3) 81 (14.9) 75 (13.9) 69 (12.9)
128 32 92 (16.8) 89 (16.3) 84 (15.4) 83 (15.2) 80 (14.8) 78 (14.4) 72 (13.4) 65 (12.4)
ADS131M06-Q1
ZHCSOP2 – AUGUST 2022
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