ADE7903

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 ar...