Analog Devices Inc. EVAL-AD7401AEDZ

Overview

EVAL-AD7401AEDZ from Analog Devices is an evaluation board for the AD7401A isolated sigma-delta modulator, enabling rapid characterization of high-accuracy shunt current sensing and isolated analog-to-digital conversion. It supports 16-bit no-missing-codes performance, ±250 mV pseudo-differential input range, on-board iCoupler® digital isolation (5000 V_rms), and operation across −40°C to +125°C.

For engineers reviewing the EVAL-AD7401AEDZ datasheet, EVAL-AD7401AEDZ pinout, EVAL-AD7401AEDZ application, or EVAL-AD7401AEDZ equivalent, this board provides validated signal integrity, layout-optimized isolation barriers, reference decimation filter implementation guidance, and direct interface to FPGA/DSP-based sinc3 filtering - critical for motor control, industrial power monitoring, and automotive inverter design.

Technical Context

The EVAL-AD7401AEDZ implements a complete test platform for the AD7401A second-order sigma-delta modulator, featuring dedicated analog input conditioning circuitry, isolated 5 V/3.3 V dual-supply rails, and edge-aligned MCLKIN/MDAT routing compliant with 20 MHz timing constraints. It integrates low-inductance shunt resistor pads and differential RC networks (22 Ω / 47 pF) aligned with AD7401A's switched-capacitor input requirements.

This board enables full validation of key isolation parameters: VIORM = 645 V_peak, transient immunity ≥25 kV/µs, and reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17). Its layout adheres to creepage/clearance ≥7.8 mm and includes thermal vias for GND1/GND2 separation, supporting safety-certified system integration.

Key Specifications

Availability

EVAL-AD7401AEDZ is available at Aetrix Electronics and suitable for AC motor controls, shunt current monitoring systems, and isolated data acquisition requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for EVAL-AD7401AEDZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The EVAL-AD7401AEDZ belongs to Analog Devices' precision isolation evaluation platform family, designed specifically to accelerate development of safety-compliant, high-SNR current and voltage sensing solutions for inverters, servo drives, and battery management systems.

FAQ

What is the primary function of the EVAL-AD7401AEDZ evaluation board?

The EVAL-AD7401AEDZ evaluation board is designed exclusively to evaluate the AD7401A isolated sigma-delta modulator. It provides a fully assembled, layout-optimized platform with calibrated analog input circuitry, isolated dual-supply generation, and direct FPGA/DSP interface capability - enabling immediate validation of 16-bit performance, isolation integrity, and timing compliance up to 20 MHz without custom PCB design. The EVAL-AD7401AEDZ does not operate as a standalone converter; it requires connection to external digital filtering hardware.

Does the EVAL-AD7401AEDZ support both 3.3 V and 5 V logic levels on its digital interface?

Yes, the EVAL-AD7401AEDZ supports both 3.3 V and 5 V logic levels on its non-isolated side (VDD2 rail), as specified for the AD7401A's MDAT and MCLKIN pins. The board includes configurable jumpers to select VDD2 between 3.3 V and 5 V, ensuring compatibility with common FPGA I/O banks and microcontroller interfaces. This matches the AD7401A's documented VIH/VIL thresholds (0.8×VDD2 and 0.2×VDD2) and allows seamless integration into mixed-voltage systems without level-shifting components.

Can the EVAL-AD7401AEDZ be used for automotive-grade current sensing validation?

Yes, the EVAL-AD7401AEDZ is qualified for automotive applications because it hosts the AEC-Q100-qualified AD7401A modulator and implements layout practices aligned with ISO 26262 functional safety requirements - including reinforced insulation per VDE 0884-17, 7.8 mm creepage/clearance, and thermal management for −40°C to +125°C operation. When paired with appropriate external filtering and host processor, the EVAL-AD7401AEDZ enables validation of inverter phase current sensing in traction inverters and onboard chargers under real-world EMI and thermal stress conditions.

What decimation filter implementation is recommended when using the EVAL-AD7401AEDZ?

Analog Devices recommends a sinc3 digital filter for use with the EVAL-AD7401AEDZ and the AD7401A modulator, as confirmed in the AD7401A datasheet (Rev. E, Section "Digital Filter"). The EVAL-AD7401AEDZ provides Verilog reference code and timing diagrams to guide FPGA implementation, supporting decimation rates up to 256 - yielding a 62.5 kHz 16-bit output rate with a 16 MHz MCLKIN. This configuration achieves >76 dB SINAD and 12.3+ ENOB, meeting high-fidelity motor control loop requirements.

Does the EVAL-AD7401AEDZ include provisions for shunt resistor selection and thermal management?

Yes, the EVAL-AD7401AEDZ includes two dedicated, low-inductance shunt resistor footprints (0805 and 1206) with Kelvin connections, enabling precise current sensing across multiple ranges. It also features thermal relief pads, exposed copper areas, and optimized via stitching beneath GND1/GND2 planes to dissipate heat from the AD7401A's 93.5 mW typical power dissipation - ensuring stable offset drift (<1 µV/°C) and INL performance during extended high-temperature operation. These features directly support the AD7401A's −40°C to +125°C specification.