Analog Devices Inc. ADuM7703 16-Bit Isolated Sigma-Delta ADC

Analog Devices Inc. ADuM7703 16-Bit Isolated Sigma-Delta (Σ-Δ) Analog to Digital Converter (ADC) is designed to convert an analog input signal to a high-speed, single-bit data stream. Featuring an integrated Low Dropout (LDO) Regulator, the ADuM7703 ADC provides high isolation between the analog input, a current sensing resistor or shunt, and the digital output. The output signal is then processed by a digital filter to provide an N-bit word. The ADC Device operates from a 4.5V to 20V power supply range (VDD1) and accepts 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 where galvanic isolation is required.

The ADuM7703 continuously samples the analog input via a high-performance analog modulator, and converts it to a single-bit digital output stream with a data rate of up to 21MHz. The original information can be reconstructed with an appropriate sinc3 digital filter to achieve an 86dB Signal-to-Noise Ratio (SNR) at 78.1kSPS with a 256 decimation rate and a 20MHz master clock. The serial input and output operates from a 5V or a 3.3V supply (VDD2).

The serial interface is digitally isolated. High-speed complementary metal-oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, results in the on-chip isolation providing outstanding performance characteristics, superior to alternatives such as optocoupler devices. 

The Analog Devices Inc. ADuM7703 is offered in an 8-lead, wide-body SOIC package, with an operating temperature range of -40°C to +105°C. This device is also available in a 16-lead, wide-body SOIC with an extended operating temperature range of -40°C to +125°C. 


  • 5MHz to 21MHz Master Clock Input Frequency
  • Offset Drift vs. Temperature: ±0.6μV/°C Maximum
  • SNR: 86dB Typical
  • 16 Bits, No Missing Codes
  • Full-scale Analog Input Voltage Range: ±320mV
  • Effective Number of Bits (ENOB): 14 Bits Typical
  • IDD1: 10mA Maximum
  • On-board Digital Isolator
  • 20V Operation on VDD1
  • High CMTI: 150kV/μs Minimum, VDD2 = 3.3V
  • Safety and Regulatory Approvals
    • UL Recognition
      • 5700Vrms for 1 Minute per UL 1577
    • CSA Component Acceptance Notice 5A (Pending)
    • VDE Certificate of Conformity
      • DIN V VDE V 0884-10: VIORM = 1270VPEAK
      • DIN V VDE V 0884-11: VIORM = 1060VPEAK (Pending)
  • Package and Operating Temperature Range
    • 16-lead SOIC_W; -40°C to +125°C 
    • 8-lead SOIC_IC with Increased Creepage; -40°C to +105°C


  • Shunt Current Monitoring
  • AC Motor Controls
  • Power and Solar Inverters
  • Wind Turbine Inverters
  • Analog-to-Digital and Optoisolator Replacement

Block Diagram

Block Diagram - Analog Devices Inc. ADuM7703 16-Bit Isolated Sigma-Delta ADC

8-Lead SOIC_W Pin Designations

Analog Devices Inc. ADuM7703 16-Bit Isolated Sigma-Delta ADC

16-Lead SOIC_W Pin Designations

Mechanical Drawing - Analog Devices Inc. ADuM7703 16-Bit Isolated Sigma-Delta ADC
Publicado: 2019-07-10 | Atualizado: 2023-08-14