AD7405BRIZ

ADCs/DACs - Special Purpose Overview

The AD7405 is a 16-bit, isolated Sigma-Delta modulator featuring an on-chip digital isolator and reference. It converts differential analog signals into a high-speed single-bit LVDS data stream using an external clock ranging from 5 MHz to 20 MHz. The device operates with VDD1 at 4.5 V to 5.5 V and VDD2 at 3 V to 5.5 V. Key electrical parameters include a typical SNR of 88 dB, ENOB of 14.2 bits, and full-scale input range of ±320 mV. It provides isolation transient immunity exceeding 25 kV/µs and functions within a temperature range of −40°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated monolithic transformer-based digital isolation with >25 kV/µs common-mode transient immunity
• On-board voltage reference and second-order Sigma-Delta modulator architecture
• LVDS interface for robust clock input and serial data output
• 16-lead wide-body SOIC_IC package ensuring increased creepage distance

ADCs/DACs - Special Purpose Applications

• Shunt current monitoring in high-voltage systems
• AC motor controls and drives
• Power and solar inverters
• Wind turbine inverters
• Replacing opto-isolators in data acquisition systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's official guide, as it determines packaging type such as tape-and-reel or tube quantities. Confirm that the procurement channel sources directly from authorized distributors to ensure component authenticity and traceability. Check for RoHS compliance status and moisture sensitivity level requirements prior to storage and soldering.

ADCs/DACs - Special Purpose Selection Notes

Select this component when galvanic isolation is required between the analog front-end and digital processing side. Ensure the system design accommodates the dual power supply rails (VDD1 and VDD2) and the external clock frequency limits of 5 MHz to 20 MHz. Verify that the digital filter implementation matches the sinc3 recommendation to achieve the specified 16-bit resolution at 78.1 kSPS.

ADCs/DACs - Special Purpose Part Context

This part belongs to the AD7405 series of isolated Sigma-Delta modulators. It is designed to replace traditional discrete isolation solutions like optocouplers by integrating the isolation barrier directly onto the silicon die. The wide-body SOIC_IC package is specifically engineered to meet stringent safety clearance and creepage requirements for industrial applications.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-to-pin replacements are limited due to the unique integration of the iCoupler technology and internal reference. Evaluate alternative isolated ADCs only if they offer comparable isolation voltage ratings and LVDS interfaces. Verify that any substitute supports the required 16-bit performance and operating temperature range.