Analog Devices Inc. EVAL-AD7766-2EDZ

Overview

EVAL-AD7766-2EDZ from Analog Devices is a dedicated evaluation board for the AD7766-2 24-bit, single-channel, oversampled SAR analog-to-digital converter. It supports 32 kSPS maximum output data rate, operates with 2.5 V AVDD1/DVDD and 5 V ADR445 reference, and enables precision DC/low-frequency signal acquisition in lab and design validation environments.

For engineers reviewing the EVAL-AD7766-2EDZ datasheet, EVAL-AD7766-2EDZ pinout, EVAL-AD7766-2EDZ application, or EVAL-AD7766-2EDZ equivalent, this board provides full hardware control, on-board analog buffering (ADA4841-1), configurable MCLK/CS/SDO routing, and seamless integration with EVAL-CED1Z for real-time FFT, histogram, and waveform analysis of high-resolution ADC performance.

Technical Context

The EVAL-AD7766-2EDZ implements a complete signal chain for evaluating the AD7766-2 ADC, including dual ADA4841-1 op-amps for differential input drive, ADR445 5 V ultraprecision reference, and ADP3330 LDOs generating 2.5 V AVDD1/DVDD and VDRIVE rails. It supports three operating modes: CED-coupled (96-way interface), standalone (via SMB connectors), and daisy-chain verification.

Link options LK1/LK2 configure ±7.5 V/–2.5 V external supply routing to power the ADA4841-1 amplifiers within absolute maximum ratings, while SL5 selects MCLK source (1 MHz onboard crystal, 1.024 MHz from CED, or external SMB input) - directly enabling the AD7766-2's 32 kSPS mode without clock scaling artifacts.

Key Specifications

Availability

EVAL-AD7766-2EDZ is available at Aetrix Electronics and suitable for precision sensor interface validation, industrial data acquisition prototyping, and high-fidelity audio test bench development requiring stable component supply and full-spectrum ADC characterization tools.

Supply support for EVAL-AD7766-2EDZ 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.

This evaluation board belongs to Analog Devices' precision data conversion evaluation platform family, designed specifically to accelerate validation of high-resolution sigma-delta and SAR ADCs in metrology, instrumentation, and industrial sensing applications.

FAQ

What is the primary function of the EVAL-AD7766-2EDZ?

The EVAL-AD7766-2EDZ is a dedicated evaluation board for the AD7766-2 24-bit SAR ADC. It provides complete hardware infrastructure-including analog front-end buffering, precision voltage reference, configurable clocking, and digital interface-to validate the AD7766-2's 32 kSPS operation, 109 dB SNR, and 16-bit linearity in real-world signal chains. The EVAL-AD7766-2EDZ does not function as a production-ready subsystem but as a lab-grade characterization tool.

Which ADC variants does the EVAL-AD7766-2EDZ support?

The EVAL-AD7766-2EDZ supports three variants: AD7766 (128 kSPS), AD7766-1 (64 kSPS), and AD7766-2 (32 kSPS). All share identical pinout and core architecture; differences lie in digital filter configuration and maximum output data rate. The board's link options (e.g., SL5 for MCLK selection) and software allow users to configure the target device's timing and filtering behavior without hardware modification.

How is the EVAL-AD7766-2EDZ powered when used with EVAL-CED1Z?

When used with EVAL-CED1Z, the EVAL-AD7766-2EDZ requires external +7.5 V and –2.5 V supplies applied to J12, as the ADA4841-1 op-amps demand a 10 V total supply spread. LK1 and LK2 must be set to Position B to route these external supplies. The board then internally generates 2.5 V (for AVDD1, DVDD, VDRIVE) and 5 V (for ADR445) using ADP3330 LDOs - no power is drawn from the 96-way CED connector for analog rails.

Does the EVAL-AD7766-2EDZ include on-board clock generation?

Yes, the EVAL-AD7766-2EDZ includes a 1 MHz onboard crystal oscillator (Y1) routed to the AD7766-2's MCLK pin via SL5 Position B. This enables direct evaluation of the AD7766-2 at its rated 32 kSPS output rate. The 1 MHz clock also allows flexible decimation ratio setup; SL5 Position C accepts 1.024 MHz from EVAL-CED1Z for maximum-rate testing, while Position A supports external MCLK injection via SMB connector J7.

Can the EVAL-AD7766-2EDZ operate without EVAL-CED1Z?

Yes, the EVAL-AD7766-2EDZ supports standalone operation using its SMB connectors (J2, J4, J5–J11, J13, J15) for analog input, logic signals (CS, SCLK, DRDY), clock (MCLK), and common-mode voltage. Link settings (SL1–SL9) must be configured per Table 2 to route signals externally. However, PC-based data capture and analysis require the EVAL-CED1Z or compatible host interface - the board has no native USB or Ethernet connectivity.