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ADE7752A Datasheet(PDF) 14 Page - Analog Devices |
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ADE7752A Datasheet(HTML) 14 Page - Analog Devices |
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14 / 24 page 
ADE7752/ADE7752A Rev. C | Page 14 of 24 ANALOG INPUTS CURRENT CHANNELS VOLTAGE CHANNELS The voltage outputs from the current transducers are connected to the ADE7752 current channels, which are fully differential voltage inputs. IAP, IBP, and ICP are the positive inputs for IAN, IBN, and ICN, respectively. The output of the line voltage transducer is connected to the ADE7752 at this analog input. Voltage channels are a pseudo- differential voltage input. VAP, VBP, and VCP are the positive inputs with respect to VN. The maximum peak differential signal on the current channel should be less than ±500 mV (353 mV rms for a pure sinusoidal signal) for the specified operation. The maximum peak differential signal on the voltage channel is ±500 mV (353 mV rms for a pure sinusoidal signal) for specified operation. Figure 17 illustrates the maximum signal levels on IAP and IAN. The maximum differential voltage between IAP and IAN is ±500 mV. The differential voltage signal on the inputs must be referenced to a common mode, such as AGND. The maxi- mum common-mode signal shown in Figure 18 illustrates the maximum signal levels that can be connected to the voltage channels of the ADE7752. Voltage channels must be driven from a common-mode voltage. In other words, the differential voltage signal on the input must be referenced to a common mode (usually AGND). The analog inputs of the ADE7752 can be driven with common-mode voltages of up to 25 mV with respect to AGND. However, best results are achieved using a common mode equal to AGND. Figure 17 is ±25 mV. DIFFERENTIAL INPUT ±500mV MAX PEAK +500mV AGND VCM IA IAP VCM –500mV COMMON-MODE ±25mV MAX IAN IAP–IAN DIFFERENTIAL INPUT ±500mV MAX PEAK +500mV AGND VCM VA VAP VCM –500mV COMMON-MODE ±25mV MAX VN VAP–VN Figure 17. Maximum Signal Levels, Current Channel Figure 18. Maximum Signal Levels, Voltage Channel |
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