Optically Isolated Sigma-Delta Modulator ACPL-796J, External Clock

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The ACPL-796J is a 1-bit, second-order sigma-delta (Σ-Δ) modulator converts an analog input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. The ACPL-796J operates from a 5 V power supply with 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.

The analog input is continuously sampled by means of sigma-delta over-sampling using external clock, coupled across the isolation barrier, which allows synchronous operation with any digital controller. The signal information is contained in the modulator data, as a density of ones with data rate up to 20 MHz, and the data are encoded and transmitted across the isolation boundary where they are recovered and decoded into high-speed data stream of digital ones and zeros. The original signal information can be reconstructed with a digital filter. The serial interface has a wide supply range of 3 V to 5.5 V.

The internal clock version modulators, HCPL-7860 (DIP-8/gull wing surface mount package) and HCPL-786J (SO-16 package), are also available.

To view ACPL-796J-0000E Functional Block Diagram click here.

Evaluation board is available. Contact your Broadcom sales representative or authorized distributor for information.


  • 5 MHz to 20 MHz external clock input range
  • 1-bit, second-order sigma-delta modulator
  • 16 bits resolution no missing codes (12 bits ENOB)
  • 74 dB minimum SNR
  • 3.5 µV/°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
  • SO-16 package
  • 25 kV/µs common-mode transient immunity
  • Safety and regulatory approval (pending):
IEC/EN/DIN EN 60747-5-5: 1230 Vpeak working insulation voltage
UL 1577: 5000 Vrms/1min double protection rating
CSA: Component Acceptance Notice #5
  • Options available are:
-000E, -060E, -500E, -560E


  • Motor phase and rail current sensing and DC bus voltage sensing.
  • Power inverter current and voltage sensing
  • Industrial Process Control
  • Data Acquisition Systems
  • General purpose current sensing and voltage sensing
  • Traditional hall effect current sensor replacements

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Product Type Miniature Isolation Amplifier
Package SO16
Gain Error at 25 Deg C (%) Max ±1
VDD2 (V) 3 - 5.5
CMR (min.) (V/µs) 25000.0
Vcm (V) 1000.0
UL Insulation Rating Viso (VRMS) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 1230.0
IEC Highest Allowable Overvoltage Viotm (VPEAK) 8000
Application Note5 i
Brochures2 i
Data Sheet1 i
Options Data Sheet3 i
Product Change Notice (PCN)7 i
Regulatory Certificate1 i
Reliability Data Sheet2 i
Selection Guide2 i
Technical Notes1 i
White Papers3 i
FAQs1 i
Promotional Material1 i


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Digital Interface IC