ADuM7703 16-Bit, Isolated, Sigma-Delta ADC

Product Details

The ADuM7703 is a high performance, second-order, Σ-Δ analog-to-digital converter (ADC) with an integrated low dropout (LDO) regulator that converts 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 device operates from a 4.5 V to 20 V power supply range (VDD1) and accepts a pseudo differential input signal of ±250 mV (±320 mV full-scale). The pseudo differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required.

The analog input is continuously sampled by a high performance analog modulator and converted to a ones density digital output stream with a data rate of up to 21 MHz. The original information can be reconstructed with an appropriate sinc3 digital filter to achieve an 86 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a 256 decimation rate and a 20 MHz master clock. The serial input and output operates from a 5 V or a 3.3 V 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 ADuM7703 device is available in a 16-lead, wide-body SOIC with an operating temperature range of −40°C to +125°C and an 8-lead, wide-body SOIC with an operating temperature range of −40°C to +105°C.


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

Features and Benefits

  • 5 MHz to 21 MHz master clock input frequency
  • Offset drift vs. temperature: ±0.6 μV/°C maximum
  • SNR: 86 dB typical
  • 16 bits, no missing codes
  • Full-scale analog input voltage range: ±320 mV
  • ENOB: 14 bits typical
  • IDD1: 10 mA maximum
  • On-board digital isolator
  • Operating temperature range
    • −40°C to +125°C (16-lead SOIC_W)
    • −40°C to +105°C (8-lead SOIC_IC)
  • 20 V operation on VDD1
  • High CMTI: 150 kV/μs minimum, VDD2 = 3.3 V
  • Wide-body SOICs
    • 16-lead SOIC_W
    • 8-lead SOIC_IC with increased creepage
  • Safety and regulatory approvals
    • UL recognition
      • 5700 V rms for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A (Pending)
    • VDE Certificate of Conformity
      • DIN V VDE V 0884-10: VIORM = 1270 VPEAK
      • DIN V VDE V 0884-11: VIORM = 1060 VPEAK (Pending)