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ADS1291IRSMR Datasheet(PDF) 7 Page - Texas Instruments |
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ADS1291IRSMR Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 75 page  ENOB = 2 log V REF 2 Gain RMS Noise ´ ´ Noise-Free Bits = 2 log 2 V REF Gain Peak-to-Peak Noise ´ SNR = ENOB 6.02 ´ ADS1291 ADS1292 ADS1292R www.ti.com SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012 PARAMETER MEASUREMENT INFORMATION NOISE MEASUREMENTS The ADS1291, ADS1292, and ADS1292R noise performance can be optimized by adjusting the data rate and PGA setting. As the averaging is increased by reducing the data rate, the noise drops correspondingly. Increasing the programmable gain amplifier (PGA) value reduces the input-referred noise, which is particularly useful when measuring low-level biopotential signals. Table 1 through Table 8 summarize the ADS1291, ADS1292, and ADS1292R noise performance. The data are representative of typical noise performance at TA = +25°C. The data shown are the result of averaging the readings from multiple devices and are measured with the inputs shorted together. For the shown data rates, the ratio is approximately 6.6. Table 1 through Table 8 show measurements taken with an internal reference. The data are also representative of the ADS1291, ADS1292, and ADS1292R noise performance when using a low-noise external reference such as the REF5025. In Table 1 through Table 8, µVRMS and µVPP are measured values. SNR, noise-free bits, ENOB, and dynamic range are calculated with Equation 1, Equation 2, and Equation 3. (1) (2) (3) Table 1. Input-Referred Noise ( μVRMS / μVPP) 3-V Analog Supply and 2.42-V Reference (1) PGA GAIN = 1 PGA GAIN = 2 DR BITS OUTPUT OF DATA –3-dB NOISE- NOISE- CONFIG1 RATE BANDWIDTH FREE FREE REGISTER (SPS) (Hz) μVRMS μVPP SNR BITS ENOB μVRMS μVPP SNR BITS ENOB 000 125 32.75 1.5 10.3 121.0 18.83 20.10 0.8 5.6 120.0 18.71 19.94 001 250 65.5 2.2 14.4 117.8 18.34 19.58 1.2 7.5 117.1 18.29 19.46 010 500 131 3.0 18.9 115.1 17.95 19.11 1.7 10.9 113.9 17.75 18.91 011 1000 262 4.6 30.8 111.3 17.25 18.49 2.5 15.6 110.6 17.23 18.37 100 2000 524 10.1 99 104.5 15.57 17.36 5.3 48 104.0 15.60 17.28 101 4000 1048 55.2 563 89.7 13.06 14.91 26.0 265 90.3 13.14 15.00 110 8000 2096 287.3 2930 75.4 10.68 12.53 144.1 1470 75.4 10.67 12.52 111 NA NA — — — — — — — — — — (1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table. Table 2. Input-Referred Noise ( μVRMS / μVPP) 3-V Analog Supply and 2.42-V Reference (1) PGA GAIN = 3 PGA GAIN = 4 DR BITS OUTPUT OF DATA –3-dB NOISE- NOISE- CONFIG1 RATE BANDWIDTH FREE FREE REGISTER (SPS) (Hz) μVRMS μVPP SNR BITS ENOB μVRMS μVPP SNR BITS ENOB 000 125 32.75 0.6 4.1 119.2 18.58 19.80 0.5 3.4 117.9 18.42 19.58 001 250 65.5 0.9 5.5 115.9 18.15 19.26 0.8 5.0 114.8 17.88 19.07 010 500 131 1.3 7.7 113.0 17.67 18.77 1.1 6.6 111.9 17.47 18.59 011 1000 262 1.9 12.0 109.5 17.02 18.19 1.6 10.3 108.7 16.83 18.06 100 2000 524 3.7 31 103.7 15.65 17.23 2.9 23 103.2 15.69 17.14 101 4000 1048 17.0 173 90.5 13.18 15.03 12.2 124 90.8 13.24 15.09 110 8000 2096 91.9 937 75.8 10.74 12.59 66.8 681 76.1 10.78 12.63 111 NA NA — — — — — — — — — — (1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: ADS1291 ADS1292 ADS1292R |
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