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Description

The ACPL-7970 is a 1-bit, second-order sigma-delta (∑-?) modulator converts an analog input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. The ACPL-7970 operates from a 5 V power supply with dynamic range of 78 dB with an appropriate digital flter. The di?erential inputs of ±200 mV (full scale ±320 mV) are ideal for direct connection to shunt resistors or other low-level signal sources in applications such as motor phase current measurement.

Features

? 10 MHz internal clock

? 1-bit, second-order sigma-delta modulator

? 16 bits resolution no missing codes (12 bits ENOB)

? 78 dB SNR

? 6 mV/°C maximum o?set drift

? ±1 maximum gain error

? Internal reference voltage

? ±200 mV linear range with single 5 V supply (±320 mV full scale)

? 3 V to 5.5 V wide supply range for digital interface

? -40° C to +105° C operating temperature range

? 25 kV/ms common-mode transient immunity

? Safety and regulatory approvals:

– IEC/EN/DIN EN 60747-5-5: 891 Vpeak working insulation voltage

– UL 1577: 5000 Vrms/1min isolation voltage

– CSA: Component Acceptance Notice #5

Applications

? Motor phase and rail current sensing

? Power inverter current and voltage sensing

? Industrial process control

? Data acquisition systems

? General purpose current and voltage sensing

? Traditional current transducer replacements