AD7403BRIZ

ADCs/DACs - Special Purpose Overview

The AD7403BRIZ is a 16-bit isolated Sigma-Delta modulator from Analog Devices, housed in a 16-lead wide-body SOIC package. It converts analog signals into a high-speed single-bit data stream using on-chip iCoupler digital isolation. The device operates with a 5V supply (VDD1) for the analog side and accepts 3V or 5V logic supplies (VDD2). Key electrical parameters include a full-scale input range of ±320 mV, an SNR of 88 dB at 78.1 kSPS, and a maximum clock frequency of 20 MHz. It features a typical offset drift of 1.6 µV/°C and supports an operating temperature range from -40°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated on-chip digital isolator based on iCoupler technology providing >25 kV/µs common-mode transient immunity.
• 16-bit resolution with guaranteed no missing codes and 88 dB typical SNR at 78.1 kSPS output rate.
• Wide-body SOIC-16 package designed for increased creepage distance and safety compliance.
• Accepts differential analog inputs up to ±320 mV full scale, suitable for shunt voltage monitoring.

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'BRIZ' corresponds to the 16-lead wide-body SOIC package and the -40°C to +125°C industrial temperature grade. Confirm that the ordering code matches the Rev C datasheet specifications for insulation ratings and regulatory approvals such as UL 1577 and VDE certification.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7403BRIZ when a 16-bit resolution and high isolation voltage are required for analog-to-digital conversion. Ensure the application utilizes an external master clock between 5 MHz and 20 MHz. Verify that the system design accommodates the separate power domains for the isolated analog side (VDD1) and the non-isolated digital interface (VDD2).

ADCs/DACs - Special Purpose Part Context

The AD7403 series includes the AD7403-8 variant, which utilizes an 8-lead wide-body SOIC package and has a restricted operating temperature range of -40°C to +105°C. The BRIZ designation specifically identifies the 16-lead version with extended temperature capabilities. Both variants share the same core Sigma-Delta modulation architecture and isolation technology.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other Analog Devices isolated ADCs or sigma-delta modulators if pin compatibility or specific insulation ratings differ from the AD7403 specifications.

ADCs/DACs - Special Purpose FAQ

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

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

How does the AD7403 achieve digital isolation?

It uses on-chip iCoupler technology, which combines high-speed CMOS technology with monolithic transformer technology to provide galvanic isolation without optical components.

What is the specified full-scale input voltage range?

The absolute full-scale range is ±320 mV, while the specified performance range for optimal linearity is ±250 mV.