AD7403BRIZ-RL

ADCs/DACs - Special Purpose Overview

The AD7403BRIZ-RL is a 16-bit isolated Sigma-Delta modulator from Analog Devices, packaged in a wide-body SOIC-16. It utilizes iCoupler technology for on-chip digital isolation, separating the analog input side (VDD1: 4.5 V to 5.5 V) from the digital output side (VDD2: 3 V to 5.5 V). The device accepts differential analog inputs within a ±320 mV full-scale range and converts them into a high-speed single-bit data stream with a maximum clock frequency of 20 MHz. Key performance metrics include an 88 dB typical signal-to-noise ratio (SNR), 14.2 bits effective number of bits (ENOB), and >25 kV/µs common-mode transient immunity.

ADCs/DACs - Special Purpose Feature Summary

• Integrated iCoupler digital isolator providing >25 kV/µs CMTI and UL/CSA/VDE safety approvals
• 16-bit resolution with guaranteed no missing codes and 88 dB typical SNR at 78.1 kSPS
• Wide-body SOIC-16 package designed for increased creepage and clearance distances
• On-board voltage reference and slew-rate limited output for low EMI

ADCs/DACs - Special Purpose Applications

• Shunt current monitoring in high-voltage systems
• AC motor controls and drive inverters
• Power and solar inverters
• Wind turbine inverters
• Data acquisition systems requiring galvanic isolation

ADCs/DACs - Special Purpose Procurement Notes

Verify the -RL suffix indicates reel packaging when sourcing. Confirm that the wide-body SOIC-16 footprint matches the PCB layout requirements for the specified creepage and clearance distances. Ensure supply voltages adhere to the 4.5 V–5.5 V range for VDD1 and 3 V–5.5 V range for VDD2 during integration.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7403BRIZ-RL over the AD7403-8 variant if operation up to +125°C is required, as the -8 version is rated only to +105°C. Ensure the external master clock frequency falls between 5 MHz and 20 MHz. Verify that the application requires a modulator output rather than a complete ADC, as a digital filter is needed to reconstruct the 16-bit word.

ADCs/DACs - Special Purpose Part Context

This component belongs to the AD7403 family of isolated Sigma-Delta modulators. It serves as a specialized data acquisition converter designed to replace traditional optocouplers and discrete isolation amplifiers in industrial applications. The BRIZ designation identifies the specific temperature grade and packaging configuration within the product line.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

ADCs/DACs - Special Purpose FAQ

What is the maximum master clock frequency supported by the AD7403?

The AD7403 supports an external master clock input frequency ranging from 5 MHz to 20 MHz.

How does the AD7403 achieve electrical isolation?

It uses on-chip iCoupler technology, which combines high-speed CMOS logic with monolithic transformer technology to provide digital isolation between the analog input and digital output sides.

What is the specified full-scale input voltage range?

The specified full-scale performance range is ±250 mV, while the absolute full-scale range extends to ±320 mV.