Analog Devices Inc. EVAL-AD7400EDZ

Overview

EVAL-AD7400EDZ from Analog Devices is a dedicated evaluation board for the AD7400 and AD7401 second-order sigma-delta modulators with on-chip iCoupler® digital isolation. It supports differential ±200 mV analog input, 10 MHz (AD7400) or 20 MHz (AD7401) data stream output, and interfaces via a standard 2-row 34-pin SPORT connector compatible with EVAL-CED1Z for real-time data capture and analysis.

For engineers reviewing the EVAL-AD7400EDZ datasheet, EVAL-AD7400EDZ pinout, EVAL-AD7400EDZ application, or EVAL-AD7400EDZ equivalent, this board enables rapid functional validation of isolated Σ-Δ modulator performance-including sinc3-filtered 16-bit output at 39 kSPS (AD7400) or 62.5 kSPS (AD7401), analog buffering via AD797 op amps, and configurable link options for standalone or controller-based operation.

Technical Context

The EVAL-AD7400EDZ implements full hardware support for evaluating the AD7400/AD7401's isolated 1-bit bitstream interface, including split ground planes preserving galvanic isolation between VDD1 (isolated side) and VDD2 (non-isolated side). It provides buffered/unbuffered analog input paths via J2/J3 SMB sockets and configurable MCLKOUT/MCLKIN and MDAT routing through solder links J7–J14 and MCLKOUT/MCLKIN/MDAT jumpers.

It integrates two AD797 op amps for high-fidelity analog signal conditioning and supports dual operating modes: direct interfacing with EVAL-CED1Z (supplying 3.3 V VDD2, 5 V VDD1, and −5 V for op amp rails when needed) or standalone use with external supplies. Link configuration Table 2 defines factory-default settings optimized for EVAL-CED1Z integration.

Key Specifications

Availability

EVAL-AD7400EDZ is available at Aetrix Electronics and suitable for industrial motor control feedback, isolated current sensing, and energy metering applications requiring stable component supply and validated reference design access.

Supply support for EVAL-AD7400EDZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and isolation-critical systems.

The EVAL-AD7400EDZ belongs to Analog Devices' precision converter evaluation platform family, designed to accelerate development of isolated measurement systems using their iCoupler®-based Σ-Δ modulators in industrial, energy, and test equipment.

FAQ

What is the primary function of the EVAL-AD7400EDZ?

The EVAL-AD7400EDZ is a dedicated evaluation board for the AD7400 and AD7401 isolated sigma-delta modulators. It provides complete hardware infrastructure-including analog input buffering, isolated power routing, SPORT interface, and configurable jumpers-to validate modulator performance, bitstream integrity, and digital filter compatibility. The EVAL-AD7400EDZ does not operate as a standalone data acquisition system but requires connection to EVAL-CED1Z or equivalent host controller for data capture and analysis.

Which devices does the EVAL-AD7400EDZ support, and are they interchangeable on this board?

The EVAL-AD7400EDZ supports both the AD7400 and AD7401 modulators, which share identical pinouts and board-level interface logic. Key differences-such as AD7400's 10 MHz maximum MCLK and AD7401's 20 MHz capability-are accommodated by configurable link settings and software-selectable decimation rates. The EVAL-AD7400EDZ hardware is fully compatible with either device without modification, and factory default links (Table 2) are set for AD7400 evaluation but can be reconfigured for AD7401 timing requirements.

Does the EVAL-AD7400EDZ include on-board analog signal conditioning?

Yes, the EVAL-AD7400EDZ includes two AD797 low-noise, high-precision operational amplifiers (U2 and U3) for optional analog input buffering. J10/J11 configure VIN+ path buffering, while J13/J14 configure VIN− path buffering. When enabled, these op amps condition differential signals before delivery to the AD7400/AD7401 inputs. The −5 V supply rail (via J1-3) is required only when using the AD797s in dual-supply mode; otherwise, unbuffered operation uses only VDD1, VDD2, and ground connections.

How is the EVAL-AD7400EDZ powered, and what supplies are mandatory?

The EVAL-AD7400EDZ requires three external power sources: VDD1 (4.5–5.25 V, isolated side, supplied via J1-1), VDD2 (3.3 V or 5 V, non-isolated side, supplied via J4-1), and optionally −5 V (for AD797 op amp bias, supplied via J1-3). When used with EVAL-CED1Z, VDD2 is sourced from the controller board's 3.3 V rail (J9 Position B), but VDD1 must always be externally supplied. GND1 and GND2 remain separate to maintain galvanic isolation integrity across the board.

Can the EVAL-AD7400EDZ operate without the EVAL-CED1Z controller board?

Yes, the EVAL-AD7400EDZ supports standalone operation when all required signals-MCLKIN, MDAT, RESET, and digital I/O-are provided externally via J5 (MCLKOUT/MCLKIN), J6 (MDAT), and other designated test points or sockets. However, no on-board FPGA or processing capability exists; raw 1-bit bitstream output still requires external digital filtering (e.g., sinc3) and decimation. Standalone use demands careful link configuration (e.g., J7–J14, MCLKOUT/MCLKIN, MDAT) and external clock/data capture hardware, unlike the plug-and-play functionality enabled by EVAL-CED1Z integration.