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AD7799BRUZ-REEL Arkusz danych(PDF) 10 Page - Analog Devices |
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AD7799BRUZ-REEL Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 28 page AD7798/AD7799 Data Sheet Rev. B | Page 10 of 28 OUTPUT NOISE AND RESOLUTION SPECIFICATIONS AD7798 Table 5 shows the AD7798 output rms noise for some update rates and gain settings. The numbers given are for the bipolar input range with a 2.5 V reference. These numbers are typical and are generated with a differential input voltage of 0 V. Table 6 shows the effective resolution, and the output peak-to-peak resolution is shown in parentheses. It is important to note that the effective resolution is calculated using the rms noise, whereas the peak-to-peak resolution is based on the peak-to-peak noise. The peak-to-peak resolution represents the resolution for which there is no code flicker. These numbers are typical and are rounded to the nearest LSB. Table 5. Output RMS Noise (µV) vs. Gain and Output Update Rate for the AD7798 Using a 2.5 V Reference Update Rate Gain of 1 Gain of 2 Gain of 4 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 4.17 Hz 0.64 0.6 0.29 0.22 0.1 0.065 0.039 0.041 8.33 Hz 1.04 0.96 0.38 0.26 0.13 0.078 0.057 0.055 16.7 Hz 1.55 1.45 0.54 0.36 0.18 0.11 0.087 0.086 33.2 Hz 2.3 2.13 0.74 0.5 0.23 0.17 0.124 0.118 62 Hz 2.95 2.85 0.92 0.58 0.29 0.2 0.153 0.144 123 Hz 4.89 4.74 1.49 1 0.48 0.32 0.265 0.283 242 Hz 11.76 9.5 4.02 1.96 0.88 0.45 0.379 0.397 470 Hz 11.33 9.44 3.07 1.79 0.99 0.63 0.568 0.593 Table 6. Typical Resolution (Bits) vs. Gain and Output Update Rate for the AD7798 Using a 2.5 V Reference Update Rate Gain of 1 Gain of 2 Gain of 4 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 4.17 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 8.33 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16.7 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 33.2 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 62 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15.5) 123 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15.5) 16 (14.5) 242 Hz 16 (16) 16 (15.5) 16 (15.5) 16 (15.5) 16 (16) 16 (16) 16 (15) 16 (14) 470 Hz 16 (16) 16 (15.5) 16 (16) 16 (16) 16 (15.5) 16 (15.5) 16 (14.5) 15.5 (13.5) |
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