AD7400YRWZ

ADCs/DACs - Special Purpose Overview

The AD7400YRWZ is a second-order sigma-delta modulator featuring integrated digital isolation via iCoupler technology. It converts analog signals into a high-speed 1-bit data stream at a 10 MHz clock rate. The device accepts differential inputs of ±200 mV (±320 mV full scale) and operates from a 5 V supply (VDD1: 4.5–5.25 V). Digital logic interfaces support 3 V or 5 V supplies (VDD2: 3–5.5 V). Key specifications include 16-bit resolution with no missing codes, ±2 LSB typical INL, and maximum offset drift of 3.5 µV/°C. Power consumption is 18 mA max at 5.25 V. It provides 5000 Vrms isolation and operates within −40°C to +105°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated on-chip digital isolator using iCoupler technology for superior performance over optocouplers.
• Second-order sigma-delta modulation with 10 MHz clock rate and 16-bit resolution without missing codes.
• On-board voltage reference and low power operation (18 mA max at 5.25 V).
• Safety approvals including UL 1577 (5000 Vrms), IEC/CSA 62368-1, and DIN EN IEC 60747-17.

ADCs/DACs - Special Purpose Applications

• AC motor controls
• Data acquisition systems
• Replacement for A/D converter plus opto-isolator combinations

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix (e.g., REEL vs. REEL7) against the required packaging format. Confirm RoHS compliance status indicated by the 'Z' suffix in the part number. Ensure the procurement source provides the official Analog Devices datasheet Rev. I for accurate electrical parameter validation.

ADCs/DACs - Special Purpose Selection Notes

Select this component when high-density digital isolation is required for sigma-delta modulators. Ensure the application supports a 10 MHz internal clock output. Verify that the downstream digital filter can process the 1-bit serial data stream. Check that the isolated side operates strictly within the 4.5 V to 5.25 V range.

ADCs/DACs - Special Purpose Part Context

The AD7400YRWZ belongs to the AD7400 series of isolated sigma-delta modulators. It is distinct from the external clock version, AD7401. The 'Y' indicates the industrial temperature grade (-40°C to +105°C), and 'RWZ' denotes the 16-lead SOIC package with RoHS compliance.

ADCs/DACs - Special Purpose Replacement Considerations

The AD7401 serves as a functional alternative if an external clock source is preferred over the internal 10 MHz oscillator. No other direct pin-compatible replacements are documented in the provided datasheet.

ADCs/DACs - Special Purpose FAQ

What is the recommended digital filter type for the AD7400?

A Sinc3 filter is recommended because it is one order higher than the second-order modulator, providing effective noise shaping and signal reconstruction.

How does the AD7400 handle analog input common-mode noise?

The switched capacitor design requires low common-mode noise. An external RC network (recommended 22 Ω resistors and 47 pF capacitor between inputs) helps isolate the op amp from sampling current spikes.

What is the maximum isolation voltage rating?

The device offers a rated dielectric insulation voltage (VISO) of 5000 Vrms for 1 minute and a maximum repetitive isolation voltage (VIORM) of 645 V peak.