Analog Devices Inc. EVAL-AD7631EDZ

Overview

EVAL-AD7631EDZ from Analog Devices is an evaluation board designed for the AD7631, a 16-bit, 250 kSPS PulSAR® successive approximation register (SAR) analog-to-digital converter in a 48-lead LQFP package. It provides buffered parallel (16-bit) and serial interfaces, on-board precision reference (ADR431 or AD780), clock oscillator, signal conditioning op-amps, and analog/digital prototyping area for system-level validation.

For engineers reviewing the EVAL-AD7631EDZ datasheet, EVAL-AD7631EDZ pinout, EVAL-AD7631EDZ application, or EVAL-AD7631EDZ equivalent, this board supports rapid characterization of high-resolution DC/AC performance-including histogram, FFT, SNR, SINAD, THD, and SFDR-via USB-connected EVAL-CED1Z capture hardware and Windows-based PulSAR evaluation software.

Technical Context

The EVAL-AD7631EDZ implements a flexible gate array (U10) that generates CNVST, controls read timing, and buffers ADC data for both parallel and serial modes. It supports stand-alone operation (no CED required) and full integration with EVAL-CED1Z via a 96-pin DIN connector, enabling 16-bit word or byte transfers and dual-mode serial interface (master/slave).

Analog input conditioning includes selectable ±12V/±5V supplies, jumper-configurable unipolar/bipolar ranges (e.g., –5 V to +5 V for AD7631), and unity-gain buffer configuration by default. Power domains are split into isolated analog and digital ground planes, joined only under the ADC to preserve 16-bit resolution.

Key Specifications

Availability

EVAL-AD7631EDZ is available at Aetrix Electronics and suitable for high-precision data acquisition systems, industrial process monitoring, and test & measurement equipment requiring stable component supply and validated ADC evaluation infrastructure.

Supply support for EVAL-AD7631EDZ 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.

The EVAL-AD7631EDZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered specifically to accelerate development and validation of high-speed, high-accuracy SAR ADCs used in precision instrumentation and automated test systems.

FAQ

What ADCs does the EVAL-AD7631EDZ support?

EVAL-AD7631EDZ is explicitly designed for the AD7631 - a 16-bit, 250 kSPS, single-ended bipolar SAR ADC - and shares compatibility across the broader AD76XX family including AD761X, AD762X, AD764X, AD765X, AD766X, AD767X, and AD795X devices. The board's jumper and DIP switch configuration allows adaptation to each device's specific input range, power, and interface requirements, as confirmed in the Rev. PrB preliminary technical data.

Does EVAL-AD7631EDZ require the EVAL-CED1Z to operate?

No, EVAL-AD7631EDZ supports both stand-alone and CED-integrated operation. In stand-alone mode, the on-board gate array (U10) autonomously generates CNVST, manages BUSY signaling, and buffers conversion data onto BD[0:15] without external hardware. The EVAL-CED1Z is optional and enhances functionality by enabling USB-based control, real-time data streaming, and full software analysis via the PulSAR Evaluation Software suite.

How is analog input range configured for the AD7631 on EVAL-AD7631EDZ?

The EVAL-AD7631EDZ is factory configured for the AD7631's ±5 V bipolar input range using its dual op-amp signal conditioning circuitry (U6/U7) and default jumper settings (JP1–JP8). Input range modification - such as switching to ±2.5 V or 0 V to 5 V - is achieved by reconfiguring solder pads S[1:7], as documented in Table 1 and the schematics, without degrading dynamic performance.

What reference options are available on EVAL-AD7631EDZ?

EVAL-AD7631EDZ offers two precision on-board references: the ADR431 (2.5 V) and AD780 (2.5 V), selected via JP4 (REFS jumper). Reference buffering is controlled by JP20 (REFB), allowing direct connection or active amplification to drive the AD7631's reference input. External references can also be applied via TP5 (REF test point), supporting validation of alternative reference architectures.

Can EVAL-AD7631EDZ perform AC performance testing like FFT and SNR analysis?

Yes, EVAL-AD7631EDZ fully supports AC characterization: low-distortion sinusoidal signals applied to SMB connectors J1 (IN+) and J2 (IN–) enable FFT-based measurements of SNR, SINAD, THD, and SFDR. The included PulSAR Evaluation Software performs real-time spectral analysis on captured data, and on-board filtering (C26/C41) ensures noise compatibility between source and ADC - all verified in the Rev. PrB technical documentation.