Analog Devices Inc. EVAL-AD7676EDZ

Overview

EVAL-AD7676EDZ from Analog Devices is an evaluation board designed for the AD7676 - a 16-bit, 500 kSPS PulSAR® successive approximation register (SAR) analog-to-digital converter in a 48-lead LFCSP package. It supports buffered parallel (16-bit) and serial interfaces, on-board precision reference (ADR431/AD780), and configurable analog signal conditioning for unipolar 0 V to 2.5 V input ranges. It is used to validate ADC performance in high-resolution data acquisition systems.

For engineers reviewing the EVAL-AD7676EDZ datasheet, EVAL-AD7676EDZ pinout, EVAL-AD7676EDZ application, or EVAL-AD7676EDZ equivalent, this board enables rapid functional validation of the AD7676's DC accuracy (transition noise), AC performance (SNR, SINAD, THD, SFDR), interface timing, and analog front-end flexibility - especially when paired with the EVAL-CED1Z capture system or operated stand-alone.

Technical Context

The EVAL-AD7676EDZ implements a gate array (U10) that generates CNVST, manages BUSY-driven data latching, and buffers parallel output BD[0:15] on a 40-pin IDC connector (P2). It supports both master and slave serial modes, with SCLK derived from either the on-board 40 MHz oscillator (U12) or external source via SMB input J3.

Analog input conditioning uses dual op-amps (U6, U7) configured as unity-gain buffers by default, with ±12 V supplies selectable via solder jumpers SJ1/SJ2 and configurable input scaling via S[1:7] pads. Ground planes are split (analog/digital) and joined under the ADC to preserve 16-bit resolution.

Key Specifications

Availability

EVAL-AD7676EDZ is available at Aetrix Electronics and suitable for high-precision data acquisition, industrial instrumentation, and test & measurement applications requiring stable component supply, full-interface validation, and production-ready ADC characterization workflows.

Supply support for EVAL-AD7676EDZ 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 control systems.

The EVAL-AD7676EDZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered to accelerate development of high-speed, high-accuracy SAR ADC applications - particularly where low power, flexible interface options, and validated analog front-end design are critical.

FAQ

What is the primary function of the EVAL-AD7676EDZ?

The EVAL-AD7676EDZ is an evaluation board specifically designed to characterize and validate the performance of the AD7676 - a 16-bit, 500 kSPS PulSAR® SAR ADC. It provides complete hardware infrastructure including reference, clock, analog signal conditioning, parallel/serial interfaces, and software integration to enable accurate DC and AC testing (e.g., histogram, FFT) without custom design effort. The EVAL-AD7676EDZ supports both stand-alone operation and use with the EVAL-CED1Z capture board.

Which ADCs does the EVAL-AD7676EDZ support besides the AD7676?

The EVAL-AD7676EDZ is part of the EVAL-AD76XXEDZ family and supports multiple 48-lead PulSAR® ADCs including the AD761X, AD762X, AD763X, AD764X, AD765X, AD766X, AD767X, and AD795X series. While it is compatible with the AD7676, configuration settings (e.g., S16/S35 switches, JP jumpers) must be adjusted per device datasheet requirements - such as input range, reference selection, and power supply voltages - to ensure correct operation of each specific ADC on the EVAL-AD7676EDZ.

Can the EVAL-AD7676EDZ operate without the EVAL-CED1Z capture board?

Yes, the EVAL-AD7676EDZ can operate in stand-alone mode. When the CONTROL input to the gate array (U10) is held LOW (default), the board autonomously generates CNVST, manages BUSY signaling, and buffers conversion data onto BD[0:15]. In parallel mode, it continuously updates the 16-bit bus after each conversion. Stand-alone operation requires external power via SJ1/SJ2 (±12 V analog, +5 V digital), manual configuration via S16/S35 DIP switches, and optional external signal sources - no EVAL-CED1Z or PC software is required for basic functionality of the EVAL-AD7676EDZ.

How is analog input range configured for the AD7676 on the EVAL-AD7676EDZ?

The AD7676 is a single-ended, unipolar ADC with a nominal input range of 0 V to 2.5 V. On the EVAL-AD7676EDZ, this is implemented using the on-board op-amp buffer circuit (U6/U7) configured as unity gain, with AVDD set to +5 V (via JP19) and reference set to 2.5 V (ADR431 via JP4). The analog input is applied to SMB connectors J1 (IN+) and J2 (IN−), and the board's default jumper settings (JP1/JP2 = BUFF, JP3/JP8 = ±12 V) support this range. No solder pad modification is needed for standard 0 V to 2.5 V evaluation of the AD7676 on the EVAL-AD7676EDZ.

What software tools are provided for the EVAL-AD7676EDZ?

Analog Devices provides the "PulSAR ADC Evaluation Software" for the EVAL-AD7676EDZ, which runs on Windows XP and requires the EVAL-CED1Z capture board. This software enables histogram analysis (for transition noise, INL/DNL), FFT-based AC performance metrics (SNR, SINAD, THD, SFDR), time-domain waveform viewing, and configurable test parameters (sample rate, input range, number of samples). It installs USB drivers for the CED1Z and supports direct data capture from the EVAL-AD7676EDZ via the 96-pin DIN interface - no firmware programming or low-level driver development is needed to use the EVAL-AD7676EDZ effectively.