JAJSML5A March 2022 – August 2022 ADS131M04-Q1
PRODUCTION DATA
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. Table 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. Table 7-2 shows the dynamic range and effective resolution calculated from the noise data. Equation 1 calculates dynamic range. Equation 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.
OSR | DATA RATE (kSPS), fCLKIN = 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 |
64 | 64 | 75.34 | 41.63 | 26.84 | 14.59 | 8.9 | 5.57 | 5.58 | 5.58 |
OSR | DATA RATE (kSPS), fCLKIN = 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) |
64 | 64 | 81 (15.0) | 80 (14.8) | 78 (14.4) | 77 (14.3) | 75 (14.0) | 74 (13.7) | 68 (12.7) | 62 (11.7) |