AD7400AYRWZ

ADCs/DACs - Special Purpose Overview

The AD7400AYRWZ is a second-order Sigma-Delta modulator featuring on-chip digital isolation and an internal reference. It converts differential analog inputs within a ±250 mV range into a high-speed 1-bit data stream at a typical 10 MHz clock rate. The device operates from a single 5 V supply (VDD1: 4.5–5.5 V) with a logic interface supporting 3 V to 5.5 V (VDD2). Key static performance metrics include 16-bit resolution with no missing codes, ±2 LSB typical integral nonlinearity (INL), and ±2 mV maximum gain error across the industrial temperature range of −40°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated iCoupler® digital isolator providing reinforced insulation up to 5000 V rms for 1 minute.
• Second-order Sigma-Delta architecture delivering 16-bit resolution with guaranteed no missing codes.
• On-chip voltage reference and continuous sampling eliminate external sample-and-hold requirements.
• Operates with a 10 MHz internal main clock output and serial CMOS/TTL compatible data interface.

ADCs/DACs - Special Purpose Applications

• AC motor controls
• Shunt current monitoring
• Data acquisition systems
• Analog-to-digital and opto-isolator replacements

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'YRWZ' against the manufacturer's ordering guide to confirm package type (SOIC-16) and temperature grade. Ensure procurement channels provide valid RoHS compliance documentation. Confirm that the component meets the required safety certifications, such as UL 1577 and IEC/CSA 62368-1, for the intended isolation application.

ADCs/DACs - Special Purpose Selection Notes

Select this component when high-voltage isolation is required between the analog input stage and digital processing logic. The internal reference simplifies design by removing external precision references. Ensure the downstream digital filter supports Sinc3 filtering with appropriate decimation rates to achieve the specified 16-bit accuracy and throughput.

ADCs/DACs - Special Purpose Part Context

The AD7400A series utilizes Analog Devices' iCoupler technology to integrate isolation directly within the ADC structure. This approach replaces traditional discrete solutions involving separate isolators and ADCs, reducing board space and signal chain complexity. The YRWZ designation specifically identifies the SOIC-16 package variant suitable for surface-mount assembly.

ADCs/DACs - Special Purpose Replacement Considerations

The AD7401A is a related variant in the same family offering an external clock option while maintaining the 16-lead SOIC package form factor. Verify pin compatibility and isolation specifications if substituting other isolated ADCs, as interface timing and power supply requirements may differ significantly.

ADCs/DACs - Special Purpose FAQ

What is the maximum analog input voltage range?

The specified full-scale input range is ±250 mV. The absolute full-scale range extends to ±320 mV, beyond which the output stream saturates.

How is the digital isolation rated?

The device provides reinforced insulation rated at 5000 V rms for 1 minute per UL 1577 and 645 V peak working isolation voltage per DIN EN IEC 60747-17.

Does the AD7400A require an external sample-and-hold circuit?

No, the analog input is sampled continuously by the internal switched-capacitor modulator, eliminating the need for external sample-and-hold circuitry.