AD7401YRWZ-REEL7

ADCs/DACs - Special Purpose Overview

The AD7401YRWZ-REEL7 is an isolated second-order Sigma-Delta modulator from Analog Devices, packaged in a 16-lead SOIC. It converts differential analog inputs of ±200 mV (±320 mV full-scale) into a high-speed 1-bit data stream with a maximum clock rate of 20 MHz. The device integrates iCoupler digital isolation and an on-chip reference. Key static performance metrics include 16-bit resolution with no missing codes, typical INL of ±2 LSB, and offset drift of 1 μV/°C. Dynamic specifications feature a minimum SNR of 80 dB and SINAD of 70 dB at 25°C. It operates from a 5 V supply (VDD1) and a 3 V to 5.5 V supply (VDD2), supporting an operating temperature range of −40°C to +105°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated iCoupler digital isolation with 5000 Vrms withstand voltage
• Second-order Sigma-Delta modulation with 20 MHz max clock rate
• On-chip voltage reference and 16-bit no-missing-codes resolution
• Low power consumption: 12 mA max at VDD1 = 5.25 V

ADCs/DACs - Special Purpose Applications

• AC motor controls
• Data acquisition systems
• A/D and opto-isolator replacements

ADCs/DACs - Special Purpose Procurement Notes

Verify the REEL7 suffix indicates tape-and-reel packaging for automated assembly. Confirm that the Y version meets the specified -40°C to +105°C operating range and insulation ratings required for your application safety standards.

ADCs/DACs - Special Purpose Selection Notes

Select this component when galvanic isolation between the analog input and digital output is required without external isolators. Ensure the driving source can handle the switched-capacitor input current. Verify that the downstream digital filter matches the decimation rate needed for the desired output word rate.

ADCs/DACs - Special Purpose Part Context

The AD7401 is part of the AD7401 family of isolated Sigma-Delta modulators. It serves as a direct replacement for traditional A/D converter and optocoupler combinations, simplifying board layout by integrating isolation and conversion in a single package.

ADCs/DACs - Special Purpose Replacement Considerations

The internal clock version AD7400 is available if an external master clock is not desired. Other members of the AD7401 series may offer different pinouts or performance characteristics; verify datasheet compatibility before substitution.

ADCs/DACs - Special Purpose FAQ

What is the maximum input voltage range?

The specified input range is ±200 mV, but the absolute full-scale range extends to ±320 mV.

How is the digital isolation implemented?

It uses Analog Devices' iCoupler technology, which combines high-speed CMOS logic with monolithic air-core transformer technology.

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

No, the analog modulator continuously samples the input signal, eliminating the need for external sample-and-hold circuitry.