ADUM7703BRWZ-RL

ADCs/DACs - Special Purpose Overview

The ADUM7703BRWZ-RL is a 16-bit, isolated Sigma-Delta analog-to-digital converter (ADC) featuring an integrated low dropout (LDO) regulator and on-chip digital isolation. It operates from a 4.5 V to 20 V supply (VDD1) with a pseudo-differential input range of ±250 mV (±320 mV full-scale). The device delivers an 86 dB typical SNR and 14-bit ENOB at a data rate of 78.1 kSPS using a 256 decimation rate. Key specifications include a maximum offset drift of ±0.6 µV/°C, a minimum common-mode transient immunity (CMTI) of 150 kV/µs, and reinforced insulation ratings up to 5700 Vrms. It is housed in a 16-lead wide-body SOIC package.

ADCs/DACs - Special Purpose Feature Summary

• Integrated LDO regulator and iCoupler-based digital isolation for galvanic separation
• High CMTI of 150 kV/µs minimum and rated dielectric insulation voltage of 5700 Vrms
• 16-bit resolution with no missing codes and ±0.99 LSB DNL guarantee
• Low offset drift of ±0.6 µV/°C maximum over temperature

ADCs/DACs - Special Purpose Applications

• Shunt current monitoring
• AC motor controls
• Power and solar inverters
• Wind turbine inverters

ADCs/DACs - Special Purpose Procurement Notes

Verify the component against the official Analog Devices datasheet Rev. B to confirm pinout compatibility and electrical parameters. Ensure that the 16-lead SOIC_W package dimensions match the target PCB footprint. Confirm that the operating environment stays within the specified -40°C to +125°C temperature range for this package variant.

ADCs/DACs - Special Purpose Selection Notes

Select this component when high-voltage isolation is required alongside precise current or voltage sensing. The ±250 mV input range is optimized for use with standard shunt resistors. Ensure the system design provides a main clock frequency between 5 MHz and 21 MHz to drive the modulator. Verify that the digital interface logic levels (3 V or 5.5 V) are compatible with the downstream processor.

ADCs/DACs - Special Purpose Part Context

This part belongs to the ADuM7703 family of isolated ADCs. The BRWZ suffix indicates the 16-lead wide-body SOIC package variant. Other variants in the series include the 8-lead SOIC_IC package. The device replaces traditional optoisolator solutions by combining the ADC and isolator into a single monolithic chip.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.

ADCs/DACs - Special Purpose FAQ

What is the maximum main clock frequency supported by the ADUM7703?

The device supports a main clock input frequency range of 5 MHz to 21 MHz.

How does the ADUM7703 handle common-mode transients?

It features a minimum Common-Mode Transient Immunity (CMTI) of 150 kV/µs at both 3.3 V and 5.5 V digital supply voltages.

What is the recommended digital filter for reconstructing the data?

A sinc3 digital filter is recommended because it is one order higher than the second-order modulator stage of the ADC.