Analog Devices Inc. EVAL-AD7654CBZ

Overview

EVAL-AD7654CBZ from Analog Devices is an evaluation board designed for the AD7654 - a 16-bit, dual-channel, single-ended unipolar SAR ADC with 500 kSPS throughput, on-board reference buffering, and parallel/serial interface support. It enables rapid characterization of dynamic performance (SNR, SINAD, THD) and DC accuracy (transition noise, histogram) for precision data acquisition systems.

For engineers reviewing the EVAL-AD7654CBZ datasheet, EVAL-AD7654CBZ pinout, EVAL-AD7654CBZ application, or EVAL-AD7654CBZ equivalent, this board supports stand-alone operation or integration with EVAL-CED1Z/EVAL-CONTRL BRDxZ capture boards, offers configurable analog input scaling (0–5 V), buffered 16-bit parallel output (BD[0:15]), and serial interface test points (SDOUT, SCLK, SYNC) - all critical for ADC validation in industrial and instrumentation designs.

Technical Context

The EVAL-AD7654CBZ implements a 4-layer PCB layout with separated analog/digital ground planes connected under the ADC to minimize noise coupling. It uses a gate array (U10) to generate CNVST, manage BUSY signaling, and buffer conversion data for both parallel and serial readout modes.

Analog signal conditioning includes dual op-amps (U6/U7) configured as unity-gain buffers by default, selectable ±12 V/±5 V supplies via jumpers JP3/JP7/JP8, and on-board ADR431 or AD780 reference with buffer (U2). The board supports AD7654-specific 2-channel SE unipolar operation at 0–5 V full-scale range, with dedicated SMB connectors (J1/J2) and test points (TP1, TP17–TP19) for signal injection and interface monitoring.

Key Specifications

Availability

EVAL-AD7654CBZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial process control, and automated test equipment requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for EVAL-AD7654CBZ 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-AD7654CBZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered specifically to accelerate validation of high-resolution SAR ADCs in demanding measurement and control applications.

FAQ

What is the primary function of the EVAL-AD7654CBZ?

The EVAL-AD7654CBZ is an evaluation board purpose-built for the AD7654 16-bit dual-channel SAR ADC. It provides complete signal chain support - including analog input conditioning, precision reference, clocking, parallel/serial data capture, and PC software - enabling engineers to validate DC accuracy (histogram), AC performance (FFT), and interface timing without custom hardware. The EVAL-AD7654CBZ directly interfaces with the AD7654's native 0–5 V unipolar SE inputs and 16-bit parallel output bus.

Does the EVAL-AD7654CBZ support stand-alone operation without a host capture board?

Yes, the EVAL-AD7654CBZ operates stand-alone using its onboard gate array (U10) to generate CNVST, manage BUSY signaling, and buffer conversion data. In stand-alone mode, it continuously updates BD[0:15] on the 40-pin IDC connector P2 after each conversion, requires only external ±12 V and +5 V supplies via SJ1/SJ2, and supports configuration via DIP switches S16/S35 - eliminating dependency on EVAL-CED1Z or EVAL-CONTRL BRDxZ for basic functionality testing of the EVAL-AD7654CBZ.

Which software tools are compatible with the EVAL-AD7654CBZ?

The EVAL-AD7654CBZ is supported by two official Analog Devices software packages: "AD76xx Evaluation Software CED" (for use with EVAL-CED1Z) and "AD76xx Evaluation Software ECB" (for EVAL-CONTROL-BRDXZ). Both provide histogram, FFT, decimation, and time-domain analysis for the AD7654. The software installs USB or parallel-port drivers, configures interface modes via S16/S35 switch settings, and reads buffered data from the EVAL-AD7654CBZ's BD[0:15] bus or serial test points - all documented in Rev. PrA preliminary technical data.

How is analog input configured for the AD7654 on the EVAL-AD7654CBZ?

The EVAL-AD7654CBZ configures the AD7654 for 0–5 V single-ended unipolar input by default using jumper JP4 (REF) to route the on-board ADR431 reference to the ADC's REF pin, and op-amps U6/U7 as unity-gain buffers. Input signals connect via SMB connectors J1 (IN+) and J2 (IN−), with optional filtering via C26/C41. For alternate ranges, hardware modifications to the analog front-end are required - the EVAL-AD7654CBZ does not natively support bipolar or differential modes for the AD7654.

What power supply requirements must be met to operate the EVAL-AD7654CBZ?

The EVAL-AD7654CBZ requires separate analog and digital supplies: ±12 V for analog circuitry (AVDD, op-amp rails, reference) via SJ1, and +5 V for digital logic (DVDD, OVDD, gate array) via SJ2. Jumpers JP3, JP6–JP9, JP19, and JP20 configure rail voltages and enable isolation; for example, JP9 must be set to VDIG for +5 V DVDD, and JP6 selects OVDD = 3.3 V to match the gate array's I/O tolerance. Incorrect settings - such as applying +5 V to AVDD on AD762x-series devices - risk permanent damage, per Rev. PrA documentation.