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ADE7753ARSRL датащи(PDF) 10 Page - Analog Devices |
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ADE7753ARSRL датащи(HTML) 10 Page - Analog Devices |
10 / 37 page ADE7753 –10– REV. PrF 10/02 PRELIMINARY TECHNICAL DATA Waveform register will give an indication of the offset in the channel. This offset can be canceled by writing an equal and opposite offset value to the relevant offset register. The offset correction can be confirmed by performing another read. Note when adjusting the offset of Channel 1, one should disable the digital integrator and the HPF. CH1OS[5:0] 00h 1Fh 3Fh +50mV -50mV 0mV Offset Adjust 01, 1111b 11, 1111b Sign + 5 Bits Sign + 5 Bits Figure 4– Channel Offset Correction Range (Gain = 1) Gain Correctable Span LSB Size 1 ±50mV 1.61mV/LSB 2 ±37mV 1.19mV/LSB 4 ±30mV 0.97mV/LSB 8 ±26mV 0.84mV/LSB 16 ±24mV 0.77mV/LSB Table II Offset Correction range di/dt CURRENT SENSOR AND DIGITAL INTEGRATOR di/dt sensor detects changes in magetic field caused by ac current. Figure 5 shows the principle of a di/dt current sensor. + - EMF (electromotive force) induced by changes in magnetic flux density (d/dt) Magnetic field created by current (directly propor tional to current) Figure 5– Principle of a di/dt current sensor The flux density of a magnetic field induced by a current is directly proportional to the magnitude of the current. The changes in the magnetic flux density passing through a conductor loop generates an electromotive force (EMF) between the two ends of the loop. The EMF is a voltage signal which is proportional to the di/dt of the current. The voltage output from the di/dt current sensor is determined by the mutual inductance between the current carrying conductor and the di/dt sensor. The current signal needs to be recovered from the di/dt signal before it can be used. An integrator is therefore necessary to restore the signal to its original form. The ADE7753 has a built-in digital integrator to recover the current signal from the di/dt sensor. The digital integrator on Channel 1 is switched off by default when the ADE7753 is powered up. Setting the MSB of CH1OS register will turn on the integrator. Figures 6 to 9 show the magnitude and phase response of the digital integrator. 10 2 10 3 -50 -40 -30 -20 -10 0 10 FREQUENCY-Hz Figure 6– Combined gain response of the digital integrator and phase compensator 10 2 10 3 -90.5 -90 -89.5 -89 -88.5 -88 FREQUENCY-Hz Figure 7– Combined phase response of the digital integra- tor and phase compensator 40 45 50 55 60 65 70 -6 -5.5 -5 -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 FREQUENCY-Hz Figure 8– Combined gain response of the digital integrator and phase compensator (40Hz to 70Hz) |
Аналогичный номер детали - ADE7753ARSRL |
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Аналогичное описание - ADE7753ARSRL |
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