Analog Devices Inc. EVAL-AD7766-1EDZ

Overview

EVAL-AD7766-1EDZ from Analog Devices is a dedicated evaluation board for the AD7766-1 24-bit, single-channel oversampled SAR ADC, supporting 64 kSPS output data rate, 109 dB SNR, and 8.5 mW power consumption at 2.5 V supply. It integrates on-board ADA4841-1 op-amps for analog buffering, ADR445 5 V precision reference, and configurable MCLK/SDO/CS/DRDY interfaces-enabling rapid characterization of high-resolution audio, vibration sensing, and precision instrumentation signal chains.

For engineers reviewing the EVAL-AD7766-1EDZ datasheet, EVAL-AD7766-1EDZ pinout, EVAL-AD7766-1EDZ application, or EVAL-AD7766-1EDZ equivalent, key selection considerations include its standalone operation capability via SMB connectors (J2, J4, J7–J11), compatibility with EVAL-CED1Z for automated PC-based analysis, dual power rail support (+7.5 V / −2.5 V), and configurable link options (LK1–LK3, SL1–SL11) for amplifier biasing, clock sourcing, and daisy-chain validation.

Technical Context

The EVAL-AD7766-1EDZ is designed exclusively to evaluate the AD7766-1 ADC variant-optimized for 64 kSPS maximum sampling rate with enhanced digital filtering versus the base AD7766 (128 kSPS) and AD7766-2 (32 kSPS). Its hardware implements differential analog input conditioning using two ADA4841-1 op-amps powered from ±7.5 V/±2.5 V rails, referenced to ADR445's 5 V output, enabling precise V_REF/2 common-mode drive required by the AD7766-1.

Interface flexibility is achieved through a 96-way connector for EVAL-CED1Z integration and discrete SMB sockets (J2, J4, J5–J11) for stand-alone logic and analog signal injection. Link configurations (e.g., SL5 for MCLK source selection, SL8 for VDRIVE routing, SL11 for common-mode sourcing) allow adaptation to external clock generators, alternate amplifiers (e.g., AD8021), or custom reference schemes without PCB modification.

Key Specifications

Availability

EVAL-AD7766-1EDZ is available at Aetrix Electronics and suitable for precision sensor interface development, industrial data acquisition system prototyping, and high-fidelity audio ADC validation requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for EVAL-AD7766-1EDZ 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 design and manufacturing expertise spanning precision data conversion, power management, and RF technologies.

The EVAL-AD7766-1EDZ belongs to Analog Devices' precision ADC evaluation platform family, engineered specifically to accelerate validation of 24-bit sigma-delta and oversampled SAR converters in demanding measurement applications where linearity, noise floor, and power efficiency are critical.

FAQ

What is the primary target device evaluated by the EVAL-AD7766-1EDZ?

The EVAL-AD7766-1EDZ is purpose-built to evaluate the AD7766-1 - a 24-bit, single-channel, oversampled successive-approximation register (SAR) analog-to-digital converter. It supports the AD7766-1's specific operating parameters, including its 64 kSPS maximum output data rate, enhanced digital filtering profile, and 16-bit linearity (15 ppm INL). The board's analog front-end, reference, and power architecture are calibrated to match the AD7766-1's electrical requirements, not the AD7766 or AD7766-2 variants.

Does the EVAL-AD7766-1EDZ support standalone operation without the EVAL-CED1Z?

Yes, the EVAL-AD7766-1EDZ supports full stand-alone operation. It provides SMB connectors (J2, J4, J5–J11) for external analog inputs, clock signals (MCLK, SCLK), control lines (CS, SYNC/PD), and data outputs (SDO, DRDY). Link options (e.g., SL1–SL6, SL8–SL11) allow users to route signals internally or externally, configure power domains, and select reference/common-mode sources - all without requiring the EVAL-CED1Z. However, PC-based data capture and analysis require the EVAL-CED1Z and bundled software.

What power supplies are required to operate the EVAL-AD7766-1EDZ with the default ADA4841-1 op-amps?

To operate the EVAL-AD7766-1EDZ with the default ADA4841-1 operational amplifiers, +7.5 V and −2.5 V DC supplies must be applied to connector J12. These voltages comply with the ADA4841-1's ±12 V maximum supply spread while enabling optimal low-noise performance. Links LK1 and LK2 must be set to Position B to route these external supplies to the op-amps and internal LDOs. The board then derives 2.5 V AVDD1, DVDD, and VDRIVE from the +7.5 V rail using ADP3330 regulators.

How does the EVAL-AD7766-1EDZ handle common-mode voltage for the AD7766-1 inputs?

The EVAL-AD7766-1EDZ delivers the required V_REF/2 = 2.5 V common-mode voltage to the AD7766-1 inputs using the ADR445's 5 V reference output. This is implemented via resistor dividers (R9/R11 and R10/R12) and configurable link SL11. By default, SL11 is set to Position B, selecting the 5 V reference as the source, which is then divided to 2.5 V. Alternative configurations (e.g., SL11-A for 2.5 V star-point sourcing or SL11-D for direct reference tap) are supported via solder links to accommodate different test setups or amplifier substitutions.

Can the EVAL-AD7766-1EDZ be used to evaluate daisy-chained AD7766-1 devices?

Yes, the EVAL-AD7766-1EDZ supports daisy-chain evaluation through configurable link SL3 and SMB socket J6. When SL3 is set to Position B, the SDI (serial data input) pin of the AD7766-1 is enabled and connected to J6, allowing serial data from a preceding device in the chain to be injected. This permits functional verification of multi-ADC synchronization, shared clock distribution, and cascaded SPI readout - essential for systems requiring simultaneous sampling across multiple channels using AD7766-1 devices.