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CS5461 Datasheet(PDF) 20 Page - Cirrus Logic |
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CS5461 Datasheet(HTML) 20 Page - Cirrus Logic |
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20 / 46 page  CS5461 20 DS546PP2 4.4.6.4 DC Gain Calibration Sequence Based on the level of the positive DC calibration voltage applied across the “+’ and “-” inputs, the CS5461 determines the DC Gain Register value by averaging the Instantaneous Register’s output sig- nal values over one computation cycle (N samples) and then dividing this average into 1. Therefore, af- ter the DC gain calibration, the Instantaneous Reg- ister will read at full-scale whenever the DC level of the input signal is equal to the level of the DC calibration signal applied to the inputs during the DC gain calibration (see Figure 9). 4.4.7 Duration of Calibration Sequence The value of the Cycle Count Register (N) deter- mines the number of conversions performed by the CS5461 during a given calibration sequence. For DC offset/gain calibrations, the calibration se- quence takes at least N + 30 conversion cycles to complete. For AC offset/gain calibrations, the cali- bration sequence takes at least 6N + 30 A/D con- version cycles to complete, (about 6 computation cycles). As N is increased, the accuracy of calibra- tion results will increase. 4.4.8 Order of Calibration Sequences 1. If the measured signal needs to include any DC content that may be present in the voltage/current and power/energy signals, run DC offset calibra- tion first. However, if the HPF options are turned on, then any DC component that may be present in V RMS Register = 230/ 250 x 1/√ 2 ≈ 0.65054 250 mV 230 mV 0 V -230 mV -250 mV 0.9999... 0.92 -0.92 -1.0000... V RMS Register = 0.6000... 250 mV 230 mV 0 V -230 mV -250 mV 0.84853 -0.84853 Before AC Gain Calibration (Vgain Register = 1) After AC Gain Calibration (Vgain Register changed to ~0.9223) Instantaneous Voltage Register Values Instantaneous Voltage Register Values Sinewave Sinewave 0.92231 -0.92231 INPUT SIGNAL INPUT SIGNAL Figure 7. Example of AC Gain Calibration V RMS Register = 230/ 250 = 0.92 250 mV 230 mV 0 V -250 mV 0.9999... 0.92 -1.0000... V RMS Register = 0.6000... 250 mV 230 mV 0 V -250 mV 0.6000 Before AC Gain Calibration (Vgain Register = 1) After AC Gain Calibration (Vgain Register changed to ~0.65217) Instantaneous Voltage Register Values Instantaneous Voltage Register Values DC Signal DC Signal 0.65217 -0.65217 INPUT SIGNAL INPUT SIGNAL Figure 8. Another Example of AC Gain Calibration V RMS Register = 230/ 250 = 0.92 250 mV 230 mV 0 V -250 mV 0.9999... 0.92 -1.0000... V RMS Register = 0.9999... 230 mV 0 V 0.9999... Before DC Gain Calibration (Vgain Register = 1) After DC Gain Calibration (Vgain Register changed to 1.0870) Instantaneous Voltage Register Values Instantaneous Voltage Register Values DC Signal DC Signal INPUT SIGNAL INPUT SIGNAL Figure 9. Example of DC Gain Calibration |
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