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ADE7903 Dataheets PDF



Part Number ADE7903
Manufacturers Analog Devices
Logo Analog Devices
Description Sigma-Delta ADC
Datasheet ADE7903 DatasheetADE7903 Datasheet (PDF)

Data Sheet 3-Channel, Sigma-Delta ADC with SPI ADE7903 FEATURES One (ADE7903) 24-bit, Σ-Δ ADC (simultaneously sampling with three ADE7912/ADE7913 ADCs) On-chip temperature sensor 4-wire SPI serial interface Standalone 24-bit, Σ-Δ ADC Up to four ADE7903 and ADE7912/ADE7913 devices clocked from a single crystal or an external clock Synchronization of multiple ADE7903 and ADE7912/ADE7913 devices ±31.25 mV peak input range for current channel ±500 mV peak input range for voltage channels Single 3..

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Data Sheet 3-Channel, Sigma-Delta ADC with SPI ADE7903 FEATURES One (ADE7903) 24-bit, Σ-Δ ADC (simultaneously sampling with three ADE7912/ADE7913 ADCs) On-chip temperature sensor 4-wire SPI serial interface Standalone 24-bit, Σ-Δ ADC Up to four ADE7903 and ADE7912/ADE7913 devices clocked from a single crystal or an external clock Synchronization of multiple ADE7903 and ADE7912/ADE7913 devices ±31.25 mV peak input range for current channel ±500 mV peak input range for voltage channels Single 3.3 V supply 20-lead, wide body SOIC package Operating temperature: −40°C to +85°C APPLICATIONS 3-phase shunt-based polyphase meters with neutral channel measurement Single-phase meters Power quality monitoring Solar inverters Process monitoring Standalone ADCs Protective devices Isolated sensor interfaces Industrial programmable logic controllers (PLCs) GENERAL DESCRIPTION The ADE7903 is a nonisolated, 3-channel, Σ-Δ analog-to-digital converter (ADC) for the neutral line of polyphase energy metering applications using shunt current sensors. The ADE7903 can also be used for single-phase energy metering and other standalone ADC applications. The ADE7903 features three 24-bit ADCs. The current ADC provides a 67 dBFS signal-to-noise ratio (SNR) over a 3.3 kHz signal bandwidth, whereas the voltage ADCs provide an SNR of 72 dBFS over the same bandwidth. One channel is dedicated to measuring the voltage across a shunt when the shunt is used for current sensing. Up to two additional channels are dedicated to measuring voltages, which are usually sensed using resistor dividers. One voltage channel can be used to measure the temperature of the die via an internal sensor. The ADE7903 includes three channels: one current channel and two voltage channels. Together with the ADE7912/ADE7913, the ADE7903 provides a small form factor, 3-phase isolated solution with a neutral TYPICAL APPLICATION CIRCUIT PHASE PHASE PHASE NEUTRAL A B C ISOLATION BARRIER LOAD V1P VM IM PHASE A ADE7912/ IP ADE7913 V2P 3.3V GNDISO_A GNDMCU V1P VM IM PHASE B ADE7912/ IP ADE7913 V2P 3.3V GNDISO_B GNDMCU V1P VM IM PHASE C ADE7912/ IP ADE7913 V2P 3.3V GNDISO_C GNDMCU V1P VM IM NEUTRAL LINE ADE7903 IP V2P 3.3V GNDMCU Figure 1. SPI INTERFACE SYSTEM MICROCONTROLLER 3.3V GNDMCU measurement. The three phases are isolated with ADE7912/ ADE7913 devices, while the neutral line is not isolated with the ADE7903. The ADE7903 configuration and status registers are accessed via a bidirectional SPI serial port for easy interfacing with microcontrollers. The ADE7903 can be clocked from a crystal or an external clock signal. To minimize the system bill of materials, the master ADE7912/ADE7913 can drive the clocks of up to three additional ADE7912/ADE7913 or ADE7903 devices. Multiple ADE7912/ADE7913 and ADE7903 devices can be synchronized to sample at the same moment and provide coherent outputs. The ADE7903 can also be used individually as a standalone ADC. The ADE7903 is available in a 20-lead, Pb-free, wide body SOIC package. 12458-001 Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADE7903 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Typical Application Circuit ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Functional Block Diagram .............................................................. 3 Specifications..................................................................................... 4 Timing Characteristics ................................................................ 6 Absolute Maximum Ratings............................................................ 7 Thermal Resistance ...................................................................... 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics ............................................. 9 Test Circuit ............................


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