Analog Devices Inc. EVAL-AD7641CBZ

Overview

EVAL-AD7641CBZ 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 input and parallel/serial interface capability. It supports on-board reference (AD780/ADR431/ADR435), buffered 18-bit parallel output, and serial port interface, and is optimized for high-resolution data acquisition systems requiring low-noise analog signal conditioning and precise DC/AC performance validation.

For engineers reviewing the EVAL-AD7641CBZ datasheet, EVAL-AD7641CBZ pinout, EVAL-AD7641CBZ application, or EVAL-AD7641CBZ equivalent, this page delivers verified technical context, interface configuration options, stand-alone vs. capture-board operation modes, analog input scaling flexibility, and software-supported FFT/histogram test capabilities essential for ADC characterization and system integration.

Technical Context

The EVAL-AD7641CBZ implements a 4-layer PCB layout with separated analog and digital ground planes connected directly under the ADC to preserve 18-bit resolution. It uses a gate array (U10) to generate conversion control signals including CNVST, manage BUSY timing, and buffer BD[0:17] data for parallel readout or serial SCLK/SDOUT/SYNC outputs.

Analog signal conditioning includes dual op-amps (U6/U7) configurable as unity-gain buffers or scalable amplifiers, with jumper-selectable ±12V/±5V/+5V supplies and solder-pad-modifiable input ranges (e.g., 0–2.5V default for AD7641). Reference circuitry supports internal bandgap sources (AD780, ADR431, ADR435) with optional buffering via U2.

Key Specifications

Availability

EVAL-AD7641CBZ is available at Aetrix Electronics and suitable for high-precision data acquisition, industrial instrumentation, and test & measurement applications requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for EVAL-AD7641CBZ 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-AD7641CBZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered specifically to accelerate development and validation of high-speed, high-resolution SAR ADCs used in precision measurement and signal chain design.

FAQ

What ADC devices does the EVAL-AD7641CBZ support?

EVAL-AD7641CBZ is designed for the AD7641 18-bit, 2 MSPS SAR ADC and is compatible across the broader AD761X–AD767X/AD795X 48-lead PulSAR® family. It supports all members listed in the ordering guide, including AD7641, AD7643, AD7621–AD7625, AD7631–AD7634, and bipolar variants like AD7663/AD7665, with configuration switches (S16/S35) and jumpers enabling mode, range, and interface adaptation per device datasheet requirements. The EVAL-AD7641CBZ itself is not an ADC but a hardware/software platform for evaluating them.

Can EVAL-AD7641CBZ operate without a capture board?

Yes, EVAL-AD7641CBZ supports stand-alone operation without EVAL-CED1Z or EVAL-CONTROL-BRDX capture boards. In stand-alone mode, the onboard gate array (U10) generates CNVST, manages BUSY signaling, and buffers conversion data to BD[0:17] on the 40-pin IDC connector P2. Configuration switches S16 and S35 allow selection of warp/normal/impulse modes, binary/2's complement output, and parallel/serial interface - all controllable locally without external hardware or PC software, though software remains optional for advanced analysis.

How is analog input configured for the AD7641 on EVAL-AD7641CBZ?

The AD7641 on EVAL-AD7641CBZ is factory-configured for differential unipolar 0–2.5V input using op-amps U6 and U7 as unity-gain buffers, with ±12V analog supplies set via solder jumpers SJ1/SJ2 and JP3/JP8. Input range scaling, gain adjustment, or bipolar adaptation (e.g., ±5V) can be achieved by modifying resistor networks (R6/R7/R29/R60) or reconfiguring jumpers per AN594 and device-specific datasheet guidance. J1/J2 SMB connectors accept low-noise analog signals, and on-board filtering (C26/C41) supports clean DC testing.

What reference options are available on EVAL-AD7641CBZ?

EVAL-AD7641CBZ provides multiple reference options: AD780 (2.5V), ADR431 (2.5V), or ADR435 (4.096V) - selected via JP4 (REF/VDD). Reference buffering is controlled by JP20 (BUFF/NO BUFF), allowing direct connection to the ADC or amplification/buffering through U2. The reference voltage is applied to the AD7641 REF pin, and its stability directly impacts INL/DNL and SNR performance; all references are precision bandgap types with low drift and noise, suitable for 18-bit accuracy validation.

Which software tools support EVAL-AD7641CBZ?

EVAL-AD7641CBZ is supported by Analog Devices' AD76xx Evaluation Software in both CED (USB-based) and ECB (parallel-port-based) versions. The software enables histogram (DC noise), FFT (SNR/SINAD/THD/SFDR), decimated AC testing, and serial programmable port (SPP) configuration for iCMOS parts. It runs on Windows 2000/XP, requires administrator privileges, and installs USB drivers (for CED) or parallel-port drivers (for ECB). Raw data is captured and processed on the PC, with graphical interfaces for time-domain, frequency-domain, and statistical analysis - all validated for use with EVAL-AD7641CBZ and compatible AD76xx ADCs.