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 differential 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 offset 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