Analog Devices Inc. EVAL-AD7643EDZ

Overview

EVAL-AD7643EDZ from Analog Devices is an evaluation board designed for the AD7643 - a 18-bit, 1.25 MSPS PulSAR® successive approximation register (SAR) analog-to-digital converter with differential unipolar 0 to 2.5 V input range. It provides buffered parallel (18-bit) and serial interfaces, on-board precision reference (AD780/ADR431/ADR435), clock oscillator, signal conditioning op-amps, and analog/digital prototyping area for ADC performance validation in data acquisition and DSP interfacing.

For engineers reviewing the EVAL-AD7643EDZ datasheet, EVAL-AD7643EDZ pinout, EVAL-AD7643EDZ application, or EVAL-AD7643EDZ equivalent, this board supports stand-alone operation or integration with the EVAL-CED1Z capture board, offers configurable CNVST generation, flexible analog input scaling (±10 V to 0–2.5 V), and PC-based histogram/FFT analysis via bundled software - all critical for high-resolution ADC system validation and interface design.

Technical Context

The EVAL-AD7643EDZ implements a 4-layer PCB layout with separated analog and digital ground planes joined under the ADC to minimize noise coupling. It uses a gate array (U10) to generate conversion control signals including CNVST, manage BUSY timing, and buffer 18-bit parallel output (BD[−2:15]) on a 40-pin IDC connector (P2) and 96-pin DIN connector (P3).

Analog signal conditioning includes dual op-amps (U6/U7) configurable as unity-gain buffers or scalable amplifiers, with solder-jumper-selectable supplies (±12 V, ±5 V, +5 V) and reference routing (on-board or AVDD). Serial interface modes support master/slave SCLK, active-high/low SYNC, and rising/falling-edge sampling - all configurable via DIP switches S16/S35 and jumpers JP1–JP22.

Key Specifications

Availability

EVAL-AD7643EDZ is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, industrial instrumentation, and test & measurement equipment requiring stable component supply, rapid ADC characterization, and flexible interface validation.

Supply support for EVAL-AD7643EDZ 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 (DSP) technologies, headquartered in Norwood, MA.

The EVAL-AD7643EDZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered specifically to accelerate development and performance verification of high-speed, high-accuracy SAR ADCs used in precision measurement and real-time signal capture applications.

FAQ

What is the primary function of the EVAL-AD7643EDZ?

The EVAL-AD7643EDZ is an evaluation board purpose-built for the AD7643 18-bit, 1.25 MSPS PulSAR® SAR ADC. It enables full performance characterization - including DC histogram and AC FFT analysis - through configurable analog front-end, on-board reference and clock, buffered parallel/serial interfaces, and Windows-based software. The board supports both stand-alone use and integration with the EVAL-CED1Z capture board, making it essential for validating high-resolution ADC behavior in real system contexts before final design implementation. EVAL-AD7643EDZ provides direct access to all critical ADC signals and configuration options without custom hardware.

Which ADC models does the EVAL-AD7643EDZ support besides the AD7643?

The EVAL-AD7643EDZ 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. Specifically, it is validated for the AD7643 (18-bit, 1.25 MSPS, 0–2.5 V differential unipolar), AD7641 (18-bit, 2 MSPS), AD7663/AD7665/AD7671 (16-bit bipolar), and others listed in Table 1 of the preliminary technical data. Configuration via DIP switches S16/S35 and jumpers ensures correct interface timing, data format, and power settings per target ADC. EVAL-AD7643EDZ's hardware flexibility allows seamless adaptation across this family without board redesign.

How is analog input range configured on the EVAL-AD7643EDZ for the AD7643?

For the AD7643 - which requires a differential unipolar 0 to 2.5 V input - the EVAL-AD7643EDZ is factory configured with U6 and U7 as unity-gain buffers referenced to VCM, delivering mid-scale bias for proper common-mode handling. Input range selection is achieved via solder pads S1–S7 and jumpers JP1–JP8: JP1/JP2 enable/disable op-amp buffering; JP3/JP8 set ±12 V op-amp supplies; and JP4 selects reference source (on-board or AVDD). No modifications are needed for 0–2.5 V operation. For other ranges (e.g., ±5 V), reconfiguration is required per the schematics and AN594 application note - but EVAL-AD7643EDZ's design ensures no performance degradation when properly adjusted.

Does the EVAL-AD7643EDZ require the EVAL-CED1Z to operate?

No, the EVAL-AD7643EDZ operates fully in stand-alone mode without the EVAL-CED1Z. When the CONTROL input to the gate array (U10) is pulled LOW (default), the board generates its own CNVST signal, manages BUSY timing, and buffers 18-bit conversion data onto P2 (40-pin IDC) continuously after each conversion. Parallel read mode is enabled by default, with CS and RD held LOW by U10. Stand-alone operation supports histogram testing using the on-board VREF/2 source and allows manual probing of TP1 (BUSY), TP8 (CNVST), and test points for SDOUT/SCLK/SYNC. However, PC-based FFT analysis and automated control require the EVAL-CED1Z and bundled software.

What software tools are provided with the EVAL-AD7643EDZ?

The EVAL-AD7643EDZ ships with Windows XP-compatible PC software accessible via C:\Program Files\Analog Devices\PulSAR ADC Evaluation Software\Eval PulSAR CED.exe. This software performs histogram analysis (code transition noise, mean, standard deviation), FFT-based AC performance metrics (SNR, SINAD, THD, SFDR), and time-domain waveform display. It supports device selection (including AD7643), adjustable sample rate and record length, input voltage range configuration, and real-time data capture from either the EVAL-CED1Z or compatible USB interface. The software requires administrator privileges for driver installation and is distributed on CD-ROM or downloadable from Analog Devices' PulSAR product page. EVAL-AD7643EDZ users rely on this tool for quantitative validation of ADC linearity, dynamic range, and noise floor prior to system integration.