Analog Devices Inc. EVAL-AD7641EDZ

Overview

EVAL-AD7641EDZ from Analog Devices is an evaluation board designed for the AD7641 - a 18-bit, 2 MSPS PulSAR® successive approximation register (SAR) analog-to-digital converter with differential unipolar 0 V to 2.5 V input range and parallel/serial interface support. It enables performance validation and system integration of high-resolution data acquisition in precision instrumentation and industrial control applications.

For engineers reviewing the EVAL-AD7641EDZ datasheet, EVAL-AD7641EDZ pinout, EVAL-AD7641EDZ application, or EVAL-AD7641EDZ equivalent, this page delivers verified hardware configuration options, interface timing behavior, reference circuitry details, and software-supported test capabilities including histogram and FFT analysis.

Technical Context

The EVAL-AD7641EDZ supports both stand-alone operation and integration with the EVAL-CED1Z capture board via a 96-pin DIN connector. It uses a gate array (U10) to generate CNVST, manage BUSY signaling, and buffer 18-bit conversion data on BD[0:15] (with BD[-2:15] accessible in stand-alone mode).

Analog signal conditioning includes dual op-amp circuitry (U6/U7), configurable ±12 V supplies, selectable on-board reference (AD780/ADR431/ADR435), and SMB connectors for low-noise analog inputs (J1/J2) and external CNVST (J3). Serial interface signals (SDOUT, SCLK, SYNC) are available at test points TP17–TP19.

Key Specifications

Availability

EVAL-AD7641EDZ is available at Aetrix Electronics and suitable for precision data acquisition, automated test equipment, and industrial process monitoring requiring stable component supply and validated ADC evaluation infrastructure.

Supply support for EVAL-AD7641EDZ 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-AD7641EDZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered to accelerate development of high-accuracy, medium-speed data acquisition systems using SAR ADCs in test, measurement, and industrial control.

FAQ

What ADCs does the EVAL-AD7641EDZ support?

The EVAL-AD7641EDZ is specifically configured for the AD7641 - an 18-bit, 2 MSPS PulSAR® SAR ADC - and shares mechanical and electrical compatibility with the broader AD76XX family including AD762X, AD763X, AD765X, AD766X, AD767X, and AD795X devices. Each requires appropriate jumper and DIP switch configuration per its resolution, input type, and interface requirements. The EVAL-AD7641EDZ documentation confirms full support for AD7641's differential unipolar 0 V to 2.5 V input range and parallel/serial data output modes.

Does EVAL-AD7641EDZ require the EVAL-CED1Z to operate?

No, EVAL-AD7641EDZ operates in stand-alone mode without EVAL-CED1Z. In that configuration, the on-board gate array (U10) generates CNVST, manages BUSY signaling, and buffers 18-bit conversion data on BD[-2:15] at the 40-pin IDC connector P2. Stand-alone operation uses configuration switches S16/S35 for mode selection and supports continuous parallel reads or serial output via test points TP17–TP19. However, full software-based analysis (histogram, FFT) requires EVAL-CED1Z and the PulSAR Evaluation Software.

How is analog input conditioning handled on EVAL-AD7641EDZ?

EVAL-AD7641EDZ provides flexible analog input conditioning using dual op-amps (U6/U7) with selectable gain, offset, and filtering. Factory-configured as unity-gain buffers for ±12 V supplies, it supports unipolar 0 V to 2.5 V input scaling for the AD7641. Input range adjustments - such as for bipolar operation or alternate voltage spans - are implemented via solder pads S[7:1] and jumpers JP1–JP3, per the schematics and Table 1. Low-noise SMB connectors J1 (IN+) and J2 (IN−) ensure clean signal injection directly into the ADC front end.

What reference options are available for the AD7641 when using EVAL-AD7641EDZ?

EVAL-AD7641EDZ supports multiple reference configurations for the AD7641: on-board AD780 (2.5 V), ADR431 (2.5 V), or ADR435 (3.0 V or 5.0 V) references, selected via JP4; direct use of AVDD as reference (JP4 = VDD); and optional buffering via JP20. The board routes reference voltage to the AD7641 REF pin and provides test point TP5 for probing. Reference stability and noise performance are enhanced by dedicated analog ground planes and low-ESR decoupling capacitors per the layout guidelines in the technical data sheet.

Can EVAL-AD7641EDZ be used for AC performance testing?

Yes, EVAL-AD7641EDZ supports rigorous AC performance testing via its low-distortion analog path and software-enabled FFT analysis. A low-jitter, low-harmonic AC source applied to SMB connectors J1/J2 drives the AD7641's differential input, while the on-board gate array synchronizes sampling. The PulSAR Evaluation Software computes SNR, SINAD, THD, and SFDR from captured data - validated in the technical data sheet with figures showing FFT spectra (Figure 6) and spectral purity metrics. External bandpass filtering may be added to suppress out-of-band noise without degrading signal integrity.