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