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AD7190 データシート(PDF) 10 Page - Analog Devices |
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AD7190 データシート(HTML) 10 Page - Analog Devices |
10 / 21 page AD7190 Preliminary Technical Data Rev.PrD 7/08 | Page 10 RMS NOISE AND RESOLUTION SPECIFICATIONS The AD7190 can be operated with chop enabled or chop disabled. With chop enabled, the settling time is two times the conversion time. The offset is continuously removed by the ADC leading to low offset and low offset drift. With chop disabled, higher update rates can be achieved from the ADC. The settling time is three times (sinc3) or four times (sinc4) the selected update rate. With chop disabled, the offset is not removed by the ADC. The offset and offset drift is comparable between chop enabled and chop disabled for gains of 32 or higher. For lower gains, however, periodic offset calibrations may be required to remove offset due to drift. SINC4 FILTER The sinc4 filter optimizes the 50 Hz/60 Hz rejection. At the higher update rates, it also gives better rms noise performance compared with the sinc3 filter. CHOP DISABLED Table 5 shows the rms noise of the AD7190 for some of the update rates and gain settings with chop disabled. The numbers given are for the bipolar input range with the external 5 V reference. These numbers are typical and are generated with a differential input voltage of 0 V. Table 6 shows 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 will be no code flicker. These numbers are typical and are rounded to the nearest half-LSB. Table 5. RMS Noise (nV) vs. Gain and Output Update Rate (continuous conversion mode) Using a 5 V Reference - Chop Disabled Filter Word (Decimal) Update Rate (Hz) Gain of 1 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 1023 4.7 174 24.71 12.65 10 8.3 7 640 7.5 196 30.28 14.52 12.28 10.37 9.5 480 10 246 38 19.33 14.14 12.00 10.26 96 50 558 87 44 35.66 27.78 25.3 16 300 1344 186 105 72.82 68.57 52.66 2 2400 4254 582 322 232 200 167 1 4800 13000 1776 900 678 497 376 Table 6. Typical Resolution (Bits) vs. Gain and Output Update Rate (continuous conversion mode) Using a 5 V Reference - Chop Disabled Filter Word (Decimal) Update Rate (Hz) Gain of 1 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 1023 4.7 24 (23) 24 (23) 24 (23) 24 (22) 24 (21.5) 23.5 (21) 640 7.5 24 (23) 24 (22.5) 24 (22.5) 24 (22) 24 (21.5) 23 (20.5) 480 10 24 (22.5) 24 (22.5) 24 (22) 24 (21.5) 23.5 (21) 23 (20.5) 96 50 24 (21.5) 24 (21.5) 24 (21.5) 23 (20.5) 22.5 (20) 21.5 (19) 16 300 23(20.5) 22.5 (20) 22.5 (20) 22 (19.5) 21 (18.5) 20.5 (18) 2 2400 21 (18.5) 21 (18.5) 21 (18.5) 20.5 (18) 19.5 (17) 19 (16.5) 1 4800 19.5 (17) 19.5 (17) 19.5 (17) 19 (16.5) 18 (15.5) 17.5 (15) |
同様の部品番号 - AD7190 |
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同様の説明 - AD7190 |
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