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ADS1232IPW Datasheet(PDF) 5 Page - Texas Instruments |
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ADS1232IPW Datasheet(HTML) 5 Page - Texas Instruments |
5 / 40 page www.ti.com NOISE PERFORMANCE ADS1232 ADS1234 SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008 The ADS1232/4 offer outstanding noise performance that can be optimized for a given full-scale range using the on-chip programmable gain amplifier. Table 1 through Table 4 summarize the typical noise performance with inputs shorted externally for different gains, data rates, and voltage reference values. The RMS and Peak-to-Peak noise are referred to the input. The Effective Number of Bits (ENOB) is defined as: • ENOB = ln (FSR/RMS noise)/ln(2) The Noise-Free Bits are defined as: • Noise-Free Bits = ln (FSR/Peak-to-Peak Noise)/ln(2) Where FSR (Full-Scale Range) = VREF/Gain Table 1. AVDD = 5V, VREF = 5V, Data Rate = 10SPS GAIN RMS NOISE PEAK-TO-PEAK NOISE(1) ENOB (RMS) NOISE-FREE BITS 1 420nV 1.79µV 23.5 21.4 2 270nV 900nV 23.1 21.4 64 19nV 125nV 22.0 19.2 128 17nV 110nV 21.1 18.4 (1) Peak-to-peak noise data are based on direct measurement. Table 2. AVDD = 5V, VREF = 5V, Data Rate = 80SPS GAIN RMS NOISE PEAK-TO-PEAK NOISE(1) ENOB (RMS) NOISE-FREE BITS 1 1.36µV 8.3µV 21.8 19.2 2 850nV 5.5µV 21.5 18.8 64 48nV 307nV 20.6 18 128 44nV 247nV 19.7 17.2 (1) Peak-to-peak noise data are based on direct measurement. Table 3. AVDD = 3V, VREF = 3V, Data Rate = 10SPS GAIN RMS NOISE PEAK-TO-PEAK NOISE(1) ENOB (RMS) NOISE-FREE BITS 1 450nV 2.8µV 22.6 20 2 325nV 1.8µV 22.1 19.7 64 20nV 130nV 21.2 18.5 128 18nV 115nV 20.3 17.6 (1) Peak-to-peak noise data are based on direct measurement. Table 4. AVDD = 3V, VREF = 3V, Data Rate = 80SPS GAIN RMS NOISE PEAK-TO-PEAK NOISE(1) ENOB (RMS) NOISE-FREE BITS 1 2.2µV 12µV 20.4 17.9 2 1.2µV 6.8µV 20.2 17.8 64 54nV 340nV 19.7 17.1 128 48nV 254nV 18.9 16.5 (1) Peak-to-peak noise data are based on direct measurement of 1024 samples. Copyright © 2005–2008, Texas Instruments Incorporated 5 Product Folder Link(s): ADS1232 ADS1234 |
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