Is ADE7912's Surge Isolation Voltage test performed using an extra Y-capacitor?

Question Is the provided data for surge isolation voltage on page 8 of datasheet (rev. PrJ) meant to be with or without an extra Y capacitor? Is there an extra Y-capacitor needed for burst/surge performance, which is not shown any of the circuit diagrams? Answer Yes, the ADE7912 has a dielectric insulation that can sustain 5kV rms for 1 minute. This is the dielectric voltage withstand test, in which the chip is tested to withstand without breakdown for 60s a potential equal to the 5kV between the input and output terminals. So no capacitor is involved for this test. In addition, the chip is also tested to the Surge isolation voltage test (10kV, 1.2us rise time, 50us 50% fall time). This test involves a capacitor because it is the capacitor that produces the discharge. We do not provide these diagrams as they are provided in the standards according to which we will be certifying the ADE7912. These certifications are mentioned in the datasheet (table 3, page 7, rev PrJ).

Question My application must use ADE7912, to measure AC and DC voltage. Can you confirmthat the A/D converter works also with DC input voltage ? Answer Yes, you can measure positive and negative DC voltages, but there will be lessaccuracy compared to AC input voltages. Use an attenuation network to step down the voltage before you feed it into theIC. What are your accuracy expectations? Based on our evaluation, we expect a typical error of 0.25% at 100:1 dynamicrange (from 353.55mVrms to 3.53mVrms for voltage channel). Over temperature (-40C to 85C) and supply(2.97V to 3.63V) ranges, the error canget to about 4% at 100:1. Of course, you will have to factor in theinaccuracies of the shunt and potential dividers in the sensing system. If this is in the ballpark of your expectations, I would suggest that youcharacterize the results to get a solid estimate of the error.

What is the difference between ADE7912 and ADE7913?

ADE7913 supports two single ended voltage measurements while ADE7912 supports one.

What three phase systems are supported by the ADE7912/ADE7913 or ADE7932/ADE7933?

Question What three phase systems are supported by the ADE7912/ADE7913 or ADE7932/ADE7933? Answer The isolation technology used inside the ADE7912/ADE7913 or ADE7932/ADE7933 guarantees that for 50 years lifetime, the three phase systems must have maximum 400V rms values. This means three phase wye (3 phase 4 wires) and delta (3 phase 3 wires) systems with nominal voltages of 230 Vrms are supported. Delta systems with nominal voltages of 400 V rms are not supported as the maximum voltages of these systems go above the 400 V rms limit.

Can I use a permanent magnet to influence the behavior of the ADE7912/ADE7913 or ADE7932/ADE7933?

Question Can I use a permanent magnet to influence the behavior of the ADE7912/ADE7913 or ADE7932/ADE7933? Answer The devices integrate chip scale air transformers that are not affected by external dc magnetic fields. Permanent magnets do not influence the behavior of these devices in any way.

What is the lowest shunt value I can use with these ADE7912/ADE7913 or ADE7932/ADE7933?

Question What is the lowest shunt value I can use with these ADE7912/ADE7913 or ADE7932/ADE7933? Answer These devices have been designed to be used with shunt values of at least 180 µΩ. Because the maximum voltage at the current channel ADC is 31.25mVpeak, this means the full scale current for a 180 µΩ shunt is (31.25* 10^-3) / ( sqaurt 2 * 180 * 10^-6) = 122.76 Arms

Can I use an external voltage reference of the ADE7912/ADE7913 or ADE7932/ADE7933?

Question Can I use an external voltage reference of the ADE7912/ADE7913 or ADE7932/ADE7933? Answer No because the isolated dc to dc converter integrated into the devices was not designed to support external circuitry on the isolated side.

I would like to monitor an 800V battery. Is this possible?

Question I would like to monitor an 800V battery. Is this possible? Answer No. The maximum continuous dc working voltage for a 50-year life is 600V. Voltages above this will degrade the lifetime significantly. Note that the maximum continuous ac voltage is 565Vpeak.

Can I power any devices off Vddiso?

Question Can I power any devices off Vddiso? Answer No. Do not connect external active circuitry to this pin. Decouple this pin with a 10 μF capacitor in parallel with a ceramic 100 nF capacitor using GNDISO pin 2.