Analog Devices: EVAL-ADE7913EBZ Evaluation Board for ADE7913  3-Channel, Isolated, Sigma Delta ADC with SPI

Kit Overview

The ADE7913 evaluation kit (EVAL-ADE7913EBZ) includes three boards that together allow the performance of the ADE7913 isolated sigma delta ADC to be evaluated in a context very close to an actual three phase meter implementation. The ADE7913 evaluation kit includes evaluation software, written in LabVIEW, that provides access to the registers of every ADE7913 using a PC interface.

The ADE7913 is isolated three-input channel, analog to digital converter (ADC) for polyphase energy metering applications using shunt current sensors. It features three 24-bit analog to digital converters, each of which provides 70dB signal to noise ratio over a 3 kHz signal bandwidth. One channel is dedicated to measuring the voltage across a shunt when the shunt is used for current sensing. Two additional channels are dedicated to measuring voltages, which are usually sensed using resistor dividers. One of these channels may be used to measure the temperature measurement of the die, using an internal sensor. The ADE7913 includes all the current, voltage and temperature measurements.

The ADE7913 include isoPower, an integrated, isolated dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler technology, the dc-to-dc converter provides the regulated power required by the first stage of the ADCs at 3.3V input supply. This device eliminates the need for an external dc-to-dc isolation block. The iCoupler chip scale transformer technology is also used to isolate the logic signals between the first and second stages of the ADC. The result is a small form factor, total isolation solution.

The ADE7913 contain a bidirectional SPI serial port interface. It provides access to the ADC outputs, configuration and status registers for easy interfacing with microcontrollers.The ADE7913 can be clocked from a crystal or an external clock signal. To minimize the system’s bill of materials, the master ADE7913 can drive clocks of up to three additional ADE7913 Multiple ADE7913 may be synchronized to sample in the same moment and provide coherent outputs.

Key Applications: Shunt based polyphase meters, Power quality monitoring, Solar inverters, Process monitoring, Protective devices