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AD7794CRUZ-REEL1 Fiches technique(PDF) 15 Page - Analog Devices |
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AD7794CRUZ-REEL1 Fiches technique(HTML) 15 Page - Analog Devices |
15 / 36 page AD7794/AD7795 Rev. D | Page 15 of 36 CHOP DISABLED With chop disabled, the switching time or settling time is reduced by a factor of two. However, periodic offset calibrations may now be required to remove offset and offset drift. When chop is disabled, the AMP-CM bit in the mode register should be set to 1. This limits the allowable common-mode voltage that can be used. However, the common-mode rejection degrades if the bit is not set. Table 11 shows the rms noise of the AD7794/AD7795 for some of the update rates and gain settings with chop disabled. The numbers given are for the bipolar input range with the internal 1.17 V reference. These numbers are typical and are generated with a differential input voltage of 0 V. Table 12 and Table 13 show the effective resolution while the output peak-to-peak (p-p) resolution is listed in brackets. It is important to note that the effective resolution is calculated using the rms noise, while the p-p resolution is calculated based on peak-to-peak noise. The p-p resolution represents the resolution for which there is no code flicker. These numbers are typical and rounded to the nearest LSB. Table 11. RMS Noise (μV) vs. Gain and Output Update Rate Using an Internal 1.17 V Reference with Chop Disabled Update Rate (Hz) 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 1.22 0.98 0.33 0.18 0.13 0.062 0.053 0.051 8.33 1.74 1.53 0.49 0.29 0.21 0.1 0.079 0.07 16.7 2.64 2.44 0.79 0.48 0.33 0.16 0.13 0.12 33.2 4.55 3.52 1.11 0.66 0.46 0.21 0.17 0.16 62 5.03 4.45 1.47 0.81 0.58 0.27 0.2 0.22 123 8.13 7.24 2.27 1.33 0.96 0.48 0.36 0.37 242 15.12 13.18 3.77 2.09 1.45 0.64 0.5 0.47 470 17.18 14.63 8.86 2.96 1.92 0.89 0.69 0.7 Table 12. Effective Resolution (Bits) vs. Gain and Output Update Rate for the AD7794 Using an Internal 1.17 V Reference with Chop Disabled Update Rate (Hz) 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 21 (18.5) 20 (17.5) 21 (18.5) 20.5 (18) 20 (17.5) 20 (17.5) 19.5 (17) 18.5 (16) 8.33 20.5 (18) 19.5 (17) 20 (17.5) 20 (17.5) 19.5 (17) 19.5 (17) 19 (16.5) 18 (15.5) 16.7 20 (17.5) 19 (16.5) 19.5 (17) 19 (16.5) 19 (16.5) 19 (16.5) 18 (15.5) 17 (14.5) 33.2 19 (16.5) 18.5 (16) 19 (16.5) 19 (16.5) 18.5 (16) 18.5 (16) 17.5 (15) 17 (14.5) 62 19 (16.5) 18 (15.5) 18.5 (16) 18.5 (16) 18 (15.5) 18 (15.5) 17.5 (15) 16.5 (14) 123 18 (15.5) 17.5 (15) 18 (15.5) 17.5 (15) 17 (14.5) 17 (14.5) 16.5 (14) 15.5 (13) 242 17 (14.5) 16.5 (14) 17 (14.5) 17 (14.5) 16.5 (14) 17 (14.5) 16 (13.5) 15 (12.5) 470 17 (14.5) 16.5 (14) 16 (13.5) 16.5 (14) 16 (13.5) 16.5 (14) 15.5 (13) 14.5 (12) Table 13. Effective Resolution (Bits) vs. Gain and Output Update Rate for the AD7795 Using an Internal 1.17 V Reference with Chop Disabled Update Rate (Hz) 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 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 8.33 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15.5) 16.7 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15.5) 16 (14.5) 33.2 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15) 16 (14.5) 62 16 (16) 16 (15.5) 16 (16) 16 (16) 16 (15.5) 16 (15.5) 16 (15) 16 (14) 123 16 (15.5) 16 (15) 16 (15.5) 16 (15) 16 (14.5) 16 (14.5) 16 (14) 15.5 (13) 242 16 (14.5) 16 (14) 16 (14.5) 16 (14.5) 16 (14) 16 (14.5) 16 (13.5) 15 (12.5) 470 16 (14.5) 16 (14) 16 (13.5) 16 (14) 16 (13.5) 16 (14) 15.5 (13) 14.5 (12) |
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