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Optically Isolated ±50 mV Sigma-Delta Modulator with CMOS Interface

The Broadcom® ACPL-736J is a 1-bit, second-order sigma- delta (Σ-Δ) modulator that oversamples an analog input signal into a high speed data stream with galvanic isolation based on optical coupling technology. The ACPL-736J operates from a 5 V power supply with dynamic range of 80 dB with an appropriate digital filter. The differential inputs of ±50 mV (full scale ±80 mV) are ideal for direct connection to shunt resistors or other low-level signal sources in applications such as motor phase current measurement.

EBV - VPF - ACPL-736J Mixed Media (MM)

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  • 5 MHz to 21 MHz external clock input range
  • CMOS clock and data interface
  • 1-bit, second-order sigma-delta modulator
  • 16 bits resolution no missing codes (12 bits ENOB)
  • 80 dB typical SNR and 78 dB typical SNDR
  • 1.0 µV/°C maximum offset drift
  • ±1% maximum gain error
  • ±50 mV linear range with single 5 V supply (±80 mV full scale range)
  • –40°C to +110°C operating temperature range
  • SO-16 package
  • 25 kV/μs common-mode transient immunity
  • Safety and regulatory approval (pending):
    • IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working insulation voltage
    • UL 1577: 5000 Vrms/1min double protection rating
    • CSA: Component Acceptance Notice #5


  • Motor phase and rail current sensing
  • Power inverter current sensing
  • Industrial Process Control
  • Data Acquisition Systems
  • General purpose current sensing
  • Traditional current transducer replacements
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