Analog Devices Inc. ADuM7701 16-Bit, Isolated Sigma-Delta Modulators

Analog Devices ADuM7701 16-Bit, Isolated Sigma-Delta (ΣΔ) Modulators convert an analog input signal into a high-speed, single-bit data stream with on-chip digital isolation based on iCoupler technology. The ADuM7701 modulators operate from a 5V (VDD1) power supply and accept a pseudo-differential input signal of ±250mV (±320mV full scale). The pseudo-differential input is ideally suited to shunt voltage monitoring in high-voltage applications requiring galvanic isolation.

The ADuM7701 continuously samples the analog input, converting to a ones density digital output stream with a data rate of up to 21MHz. The serial input/output operates from a 5V or a 3.3V supply (VDD2). The device receives the original information reconstructed with an appropriate digital filter to achieve an 86dB signal to noise ratio (SNR) at 78.lkSPS with a 20MHz MCLK.

The device features a serial interface that is digitally isolated. Combining CMOS and monolithic transformer technology results in outstanding performance characteristics, superior to alternatives using on-chip isolation. The ADuM7701 is available in both 16-lead and 8-lead wide-body SOIC packages and operate in a temperature range of -40°C to +125°C.


  • 5MHz to 21MHz external clock input rate
  • 1μV/°C Max offset drift vs. temperature
  • 86dB Typical Signal-to-noise ratio (SNR)
  • 16 bits, no missing codes
  • ±320mV Full-scale analog input range
  • 14-bits Typical Effective number of bits (ENOB): 14 bits typical
  • Current consumption 10mA max
  • On-board digital isolator
  • -40°C to +125°C Operating range
  • >150kV/μs Typical High common-mode transient immunity
  • Wide-body SOIC with increased creepage package
    • 16-pin and 8-pin package options
  • Safety and regulatory approvals (pending)
    • UL recognition
      • 5700Vrms for 1 minute per UL 1577
  • CSA Component Acceptance Notice SA
  • VOE Certificate of Conformity
    • DIN V VDE V 0884-10
    • VlORM = 1270 VPEAK
    • DIN V VDE V 0884-11
    • VlORM = 1060 VPEAK


  • Shunt curent monitoring
  • AC motor controls
  • Power and solar inverters
  • Wind turbine inverters
  • Analog-to-digital and optoisolator replacement

Block Diagram

Block Diagram - Analog Devices Inc. ADuM7701 16-Bit, Isolated Sigma-Delta Modulators
Published: 2019-05-22 | Updated: 2023-10-02