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AD7170 Folha de dados(PDF) 9 Page - Analog Devices |
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AD7170 Folha de dados(HTML) 9 Page - Analog Devices |
9 / 16 page AD7170 Rev. 0 | Page 9 of 16 OUTPUT NOISE AND RESOLUTION SPECIFICATIONS Table 6 shows the rms noise of the AD7170. The numbers given are for a 5 V and a 3 V reference. These numbers are typical and are generated with a differential input voltage of 0 V. The corresponding p-p resolution is also listed, along with the effective resolution (ENOB). It is important to note that the effective resolution is calculated using the rms noise, whereas the p-p resolution is based on the p-p noise. The p-p resolution represents the resolution for which there is no code flicker. These numbers are typical. The effective number of bits (ENOB) is defined as ENOB = ln (FSR/RMS noise)/ln(2) The noise-free bits, or p-p resolution, are defined as Noise-Free Bits = ln (FSR/Peak-to-Peak Noise)/ln(2) where FSR is the full-scale range and is equal to 2 × VREF/gain. Table 6. RMS Noise and Resolution of the AD7170 VREF = VDD RMS Noise P-P Noise P-P Resolution ENOB 5 V 11.5 μV 76 μV 12 bits 12 bits 3 V 6.9 μV 45 μV 12 bits 12 bits |
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