Analog Devices Inc. EVAL-AD7765EDZ

Overview

EVAL-AD7765EDZ from Analog Devices is a dedicated evaluation board for the AD7765 24-bit Σ-Δ analog-to-digital converter, supporting full-speed operation at 156 kSPS with 104 dB SNR and integrated digital FIR filtering. It interfaces directly with the EVAL-CED1Z FPGA-based controller board via SPORT header, accepts differential audio-grade analog input via XLR connector (J1), and provides on-board 4.096 V ADR444 reference and dual regulated supplies (2.5 V/5 V) for ADC and oscillator.

For engineers reviewing the EVAL-AD7765EDZ datasheet, EVAL-AD7765EDZ pinout, EVAL-AD7765EDZ application, or EVAL-AD7765EDZ equivalent, this board enables rapid validation of high-resolution data acquisition in vibration monitoring, sonar signal conditioning, and precision sensor readout-requiring no custom hardware to capture, visualize, and analyze time-domain waveforms, histograms, or FFTs using included PC software.

Technical Context

The EVAL-AD7765EDZ implements a complete signal chain for the AD7765 ADC, including differential front-end amplification, low-noise 4.096 V reference (ADR444), and decoupled 2.5 V (ADP3330-2.5) and 5 V (ADP3330-5) power rails. It supports both synchronized operation with EVAL-CED1Z (MCLK sourced externally) and standalone mode (40 MHz crystal oscillator, SMB MCLK input).

Hardware link options (R8/R11/R29) configure MCLK source selection, while 34-pin J4 header and test points expose all digital signals (SDO, SDO, FSI, FSO, SYNC, RESET) and decimation control lines. The board uses a 4-layer PCB with dedicated ground plane and optimized layout per AD7765's decoupling requirements.

Key Specifications

Availability

EVAL-AD7765EDZ is available at Aetrix Electronics and suitable for vibration monitoring systems, sonar transducer signal chains, and industrial precision data acquisition requiring stable component supply, traceable evaluation hardware, and immediate access to production-ready ADC characterization tools.

Supply support for EVAL-AD7765EDZ 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, headquartered in Norwood, MA, with deep expertise in precision data conversion and sensor signal conditioning.

The EVAL-AD7765EDZ belongs to Analog Devices' Converter Evaluation Platform family, designed specifically to accelerate development of high-resolution, low-noise data acquisition systems for demanding instrumentation and condition-monitoring applications.

FAQ

What is the primary function of the EVAL-AD7765EDZ?

The EVAL-AD7765EDZ is a dedicated evaluation board for the AD7765 24-bit Σ-Δ ADC. It provides a fully configured, production-layout-validated hardware platform-including reference, power regulation, differential input, and digital interface-to enable engineers to characterize, validate, and integrate the AD7765 into high-precision data acquisition systems without designing custom circuitry. The EVAL-AD7765EDZ supports both EVAL-CED1Z-connected and standalone operation modes.

Does the EVAL-AD7765EDZ require the EVAL-CED1Z board to operate?

No, the EVAL-AD7765EDZ can operate in standalone mode. When used without EVAL-CED1Z, users must provide external MCLK (via SMB connector J17), SYNC, RESET, and decimation control signals, and acquire digital output (SDO, FSO) through the 34-pin J4 header or test points. However, full functionality-including PC-based waveform visualization, FFT, and histogram analysis-requires the EVAL-CED1Z and bundled software.

What reference voltage does the EVAL-AD7765EDZ use, and why is it significant?

The EVAL-AD7765EDZ uses the ADR444ARZ, a precision 4.096 V low-noise voltage reference. This value matches the AD7765's internal full-scale range and enables exact 1-LSB resolution across the entire 24-bit output code space (0–16,777,215). Its low drift and noise preserve the ADC's specified 104 dB SNR and ensure accurate calibration and linearity validation during evaluation.

How is analog input connected to the EVAL-AD7765EDZ?

Analog input is applied differentially to the XLR female connector J1, which routes signals through the AD7765's on-chip differential amplifier. This connector supports professional audio-grade balanced inputs, minimizing common-mode noise and enabling direct connection to accelerometers, hydrophones, or other low-level transducers. Input gain and filtering are configured via the AD7765's internal registers-not external components-ensuring consistent, repeatable signal chain behavior.

What software and drivers are included with the EVAL-AD7765EDZ?

The EVAL-AD7765EDZ ships with self-installing Windows-compatible software (Windows 2000/XP) that provides real-time control of the AD7765-including power mode, decimation rate, MCLK frequency, and gain/overrange register settings-and displays acquired data as time-domain waveforms, histograms, or FFTs. It requires the EVAL-CED1Z USB driver (installed automatically during setup) and includes LabVIEW source code and FPGA bitfiles for customization and integration into user-defined test systems.