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CS5525-ASZ 数据表(PDF) 18 Page - Cirrus Logic |
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CS5525-ASZ 数据表(HTML) 18 Page - Cirrus Logic |
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18 / 30 page ![]() CS5525 CS5526 18 DS202F5 VREF- as shown in Figure 12. For any input range other than the 2.5 V range, the modulator gain error can not be completely calibrated out. This is due to the lack of an accurate full scale voltage internal to the chips. The 2.5 V range is an exception because the external reference voltage is 2.5 V nominal and is used as the full scale voltage. In addition, when self-calibration of gain is performed in the 25 mV, 55 mV, and 100 mV input ranges, the instrumenta- tion amplifier’s gain is not calibrated. These two factors can leave the converters with a gain error of up to ±20% after self-calibration of gain. There- fore, a system gain is required to get better accura- cy, except for the 2.5 V range. System Calibration For the system calibration functions, the user must supply the converters calibration signals which rep- resent ground and full scale. When a system offset calibration is performed, a ground reference signal must be applied to the converter. See Figures 13 and 14. As shown in Figures 15 and 16, the user must input a signal representing the positive full scale point to perform a system gain calibration. In either case, the calibration signals must be within the specified calibration limits for each specific calibration step (refer to the System Calibration Specifications). AIN+ AIN- OPEN + - X20 + - OPEN CLOSED VREF+ CLOSED VREF- + - Reference Figure 12. Self Calibration of Gain (All Ranges). + - X20 + - External Connections 0V + - AIN+ AIN- CM + - Figure 13. System Calibration of Offset (Low Ranges). + - X20 + - External Connections + - AIN+ AIN- CM + - 0V Figure 14. System Calibration of Offset (High Ranges). + - X20 + - External Connections Full S cale +- AIN+ AIN- CM + - Figure 15. System Calibration of Gain (Low Ranges) + - X20 + - External Connections Full Scale + - AIN+ AIN- CM + - Figure 16. System Calibration of Gain (High Ranges). |
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