Broadcom ACPL-C740 optically isolated sigma-delta modulator

The ACPL-C740 is a 1-bit, second-order sigma-delta (Ʃ-∆) modulator that converts an analog input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. The ACPL-C740 operates from a 5 V power supply with a dynamic range of 80 dB with an appropriate digital filter. 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.

Key features

• Superior optical isolation and insulation
• 20MHz internal clock
• 1-bit, second-order sigma-delta modulator
• 16 bits resolution no missing codes (12 bits ENOB)

Additional features

• 80 dB SNR
• TBD μV/°C maximum offset drift
• ±1% gain error
• Internal reference voltage
• ±200 mV linear range with single 5 V supply (±320 mV full scale)
• 3V to 5.5V wide supply range for digital interface
• –40°C to +110°C operating  temperature  range
• SSO-8 package
• 25 kV/μs common-mode transient immunity
• Safety and regulatory approval:
• IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working insulation voltage
• UL 1577: 5000 Vrms/1 min 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

Learn more about Broadcom industrial motion control and industrial robotics solutions:

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