Analog Devices Inc. AD7402 Isolated Sigma-Delta Modulators

Analog Devices AD7402 features high-performance, second-order, Σ-Δ modulators that convert an analog input signal into a high-speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The AD7402 operates from a 4.5 to 5.5V (VDD1) power supply and accepts a differential input signal of ±250mV (±320mV full scale). The differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required. AD7402 continuously samples analog input using a high-performance analog modulator and converts it into a density, digital output stream with a data rate of 10MHz. Designers can reconstruct the original information with an appropriate digital filter to achieve an 87dB signal-to-noise ratio (SNR) at 39kSPS. The serial input/output can use a 3V to 5.5V or a 3.3V supply (VDD2). Designed with high-speed CMOS technology and a digitally isolated serial interface, AD7402 is well-suited for shunt current monitoring, AC motor controls, power and solar inverters, wind turbine inverters, data acquisition systems, and analog-to-digital and optoisolator replacements.


  • 10MHz internal clock rate
  • 16bits no missing codes
  • Signal-to-noise ratio (SNR): 87dB typical
  • Effective number of bits (ENOB): 13.5bits typical
  • Typical offset drift vs. temperature: 1.7μV/°C
  • On-board digital isolator
  • On-board reference
  • Full-scale analog input range: ±320mV
  • −40°C to +105°C operating range
  • High common-mode transient immunity: >25kV/μs
  • 8-lead, wide-body SOIC, with increased creepage package
  • Slew rate limited output for low electromagnetic interference (EMI)


  • Shunt current monitoring
  • AC motor controls
  • Power and solar inverters
  • Wind turbine inverters
  • Data acquisition systems
  • Analog-to-digital and optoisolator replacements

Functional Block Diagram

Analog Devices Inc. AD7402 Isolated Sigma-Delta Modulators
Published: 2015-09-11 | Updated: 2022-03-11