3-Channel, Sigma-Delta ADC with SPI Data Sheet ADE7903 FEATURES TYPICAL APPLICATION CIRCUIT PHASE PHASE PHASE ISOLATION One (ADE7903) 24-bit, - ADC (simultaneously sampling NEUTRAL A B C BARRIER with three ADE7912/ADE7913 ADCs) V1P 3.3V On-chip temperature sensor VM IM 4-wire SPI serial interface PHASE A ADE7912/ Standalone 24-bit, - ADC ADE7913 IP Up to four ADE7903 and ADE7912/ADE7913 devices clocked V2P from a single crystal or an external clock GND GND ISO A MCU Synchronization of multiple ADE7903 and ADE7912/ADE7913 V1P 3.3V devices VM 3.3V IM PHASE B 31.25 mV peak input range for current channel ADE7912/ 500 mV peak input range for voltage channels ADE7913 IP Single 3.3 V supply V2P 20-lead, wide body SOIC package GND GND ISO B MCU Operating temperature: 40C to +85C V1P 3.3V VM APPLICATIONS IM PHASE C ADE7912/ 3-phase shunt-based polyphase meters with neutral channel ADE7913 IP GND MCU measurement V2P Single-phase meters GND GND ISO C MCU Power quality monitoring V1P 3.3V Solar inverters VM NEUTRAL IM LINE Process monitoring ADE7903 Standalone ADCs IP V2P Protective devices LOAD Isolated sensor interfaces GND MCU Industrial programmable logic controllers (PLCs) Figure 1. GENERAL DESCRIPTION The ADE7903 is a nonisolated, 3-channel, - analog-to-digital measurement. The three phases are isolated with ADE7912/ converter (ADC) for the neutral line of polyphase energy ADE7913 devices, while the neutral line is not isolated with the metering applications using shunt current sensors. The ADE7903. ADE7903 can also be used for single-phase energy metering The ADE7903 configuration and status registers are accessed and other standalone ADC applications. The ADE7903 features via a bidirectional SPI serial port for easy interfacing with three 24-bit ADCs. The current ADC provides a 67 dBFS microcontrollers. signal-to-noise ratio (SNR) over a 3.3 kHz signal bandwidth, The ADE7903 can be clocked from a crystal or an external whereas the voltage ADCs provide an SNR of 72 dBFS over the clock signal. To minimize the system bill of materials, the same bandwidth. One channel is dedicated to measuring the master ADE7912/ADE7913 can drive the clocks of up to three voltage across a shunt when the shunt is used for current sensing. additional ADE7912/ADE7913 or ADE7903 devices. Up to two additional channels are dedicated to measuring voltages, which are usually sensed using resistor dividers. Multiple ADE7912/ADE7913 and ADE7903 devices can be synchronized to sample at the same moment and provide One voltage channel can be used to measure the temperature of the die via an internal sensor. The ADE7903 includes three coherent outputs. The ADE7903 can also be used individually channels: one current channel and two voltage channels. as a standalone ADC. Together with the ADE7912/ADE7913, the ADE7903 provides The ADE7903 is available in a 20-lead, Pb-free, wide body SOIC a small form factor, 3-phase isolated solution with a neutral package. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com SPI INTERFACE SYSTEM MICROCONTROLLER 12458-001ADE7903 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Protecting the Integrity of Configuration Registers .............. 17 Applications ....................................................................................... 1 CRC of Configuration Registers............................................... 17 Typical Application Circuit ............................................................. 1 ADE7903 Status .......................................................................... 17 General Description ......................................................................... 1 Applications Information .............................................................. 18 Revision History ............................................................................... 2 ADE7903 in Polyphase Energy Meters ................................... 18 Functional Block Diagram .............................................................. 3 ADE7903 in Single-Phase Energy Meters ............................... 19 Specifications ..................................................................................... 4 ADE7903 Clock .......................................................................... 20 Timing Characteristics ................................................................ 6 SPI-Compatible Interface .......................................................... 20 Absolute Maximum Ratings ............................................................ 7 Synchronizing Multiple ADE7912/ADE7913 and ADE7903 Devices ....................................................................... 22 Thermal Resistance ...................................................................... 7 Power Management ........................................................................ 23 ESD Caution .................................................................................. 7 Power-Up and Initialization Procedures ................................. 23 Pin Configuration and Function Descriptions ............................. 8 Hardware Reset ........................................................................... 24 Typical Performance Characteristics ............................................. 9 Software Reset ............................................................................. 24 Test Circuit ...................................................................................... 11 Power-Down Mode .................................................................... 24 Terminology .................................................................................... 12 Layout Guidelines ........................................................................... 25 Theory of Operation ...................................................................... 14 ADE7903 Evaluation Board ...................................................... 25 Analog Inputs .............................................................................. 14 ADE7903 Version ....................................................................... 25 Analog-to-Digital Conversion .................................................. 14 Register List ..................................................................................... 26 Reference Circuit ........................................................................ 16 Outline Dimensions ....................................................................... 28 CRC of ADC Output Values ..................................................... 16 Ordering Guide .......................................................................... 28 Temperature Sensor ................................................................... 16 REVISION HISTORY 12/14Revision 0: Initial Version Rev. 0 Page 2 of 28