Analog Devices Inc. EVAL-AD7608EDZ

Overview

EVAL-AD7608EDZ from Analog Devices is an evaluation board for the AD7608 8-channel, 18-bit, simultaneous-sampling analog-to-digital data acquisition system (DAS). It supports ±10 V and ±5 V true bipolar input ranges, operates from a single 5 V analog supply with 2.3 V–5.25 V logic voltage, delivers 200 kSPS throughput per channel, and integrates on-chip 2.5 V reference, second-order antialiasing filter, and clamp protection-enabling rapid prototyping of power line monitoring and multiaxis positioning systems.

For engineers reviewing the EVAL-AD7608EDZ datasheet, EVAL-AD7608EDZ pinout, EVAL-AD7608EDZ application, or EVAL-AD7608EDZ equivalent, this page provides verified hardware interface details, supported ADC configuration modes (parallel/serial), oversampling control via OS[2:0], conversion timing constraints, and direct connection guidance to host processors including FPGAs and DSPs using SPI/QSPI/MICROWIRE-compatible protocols.

Technical Context

The EVAL-AD7608EDZ implements the full signal chain of the AD7608 IC: eight independent analog front-ends each with 1 MΩ input impedance, ±16.5 V clamp protection, and second-order low-pass filtering (22 kHz −3 dB cutoff); dual CONVST inputs enable phase-controlled sampling of two 4-channel groups; BUSY and FRSTDATA signals provide precise read synchronization.

It exposes all digital interface options-parallel 16-bit DB[15:0] bus with RD/CS control, or dual-output serial mode (DOUTA/DOUTB) clocked by RD/SCLK-while supporting configurable oversampling ratios (1× to 64×) via OS[2:0] pins and input range selection (±10 V/±5 V) via RANGE pin, all validated per AD7608 Rev. C timing specifications including tCONV = 4 µs (no oversampling) and tWAKE-UP STANDBY = 100 µs.

Key Specifications

Availability

EVAL-AD7608EDZ is available at Aetrix Electronics and suitable for power line monitoring, multiphase motor control, instrumentation systems, and multiaxis positioning applications requiring stable component supply, traceable evaluation hardware, and documented interface compatibility with FPGA/DSP host platforms.

Supply support for EVAL-AD7608EDZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The EVAL-AD7608EDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed to accelerate development of high-channel-count, high-resolution DAS solutions for industrial automation, energy metering, and test equipment.

FAQ

What is the primary function of the EVAL-AD7608EDZ evaluation board?

The EVAL-AD7608EDZ evaluation board is a fully assembled and tested platform for evaluating the AD7608 8-channel, 18-bit simultaneous-sampling ADC. It provides immediate access to all analog inputs (V1–V8), digital interface signals (DB[15:0], CONVST A/B, BUSY, FRSTDATA, OS[2:0]), and configurable power/reference options-enabling engineers to validate timing, noise performance, and interface behavior of the EVAL-AD7608EDZ without custom PCB design.

Does the EVAL-AD7608EDZ support both parallel and serial communication with host processors?

Yes, the EVAL-AD7608EDZ supports both modes. When PAR/SER SEL is low, it enables parallel 16-bit data transfer via DB[15:0], RD, and CS; when high, it configures RD/SCLK as serial clock and DB7/DOUTA & DB8/DOUTB as dual serial outputs-fully compliant with SPI/QSPI/MICROWIRE protocols. All timing parameters-including tCONV = 4 µs and tCYCLE = 5 µs-are implemented per AD7608 Rev. C specifications on the EVAL-AD7608EDZ.

How does the EVAL-AD7608EDZ handle analog input range selection and oversampling?

The EVAL-AD7608EDZ routes the RANGE pin to a header for ±10 V / ±5 V selection and OS[2:0] pins to jumpers or DIP switches, allowing hardware-configured oversampling ratios from 1× to 64×. These controls directly drive the AD7608's internal digital filter and front-end gain settings-verified in the EVAL-AD7608EDZ layout to maintain SNR >98 dB (±10 V, 16× oversampling) and THD <−107 dB as specified in the AD7608 datasheet.

Can the EVAL-AD7608EDZ be used with external reference sources like the ADR421?

Yes, the EVAL-AD7608EDZ includes REFIN/REFOUT and REF SELECT connections compatible with external references such as the ADR421 and ADR431. The board supports both internal 2.5 V reference operation and external reference mode, with proper decoupling (REFCAPA/REFCAPB) and grounding (REFGND) implemented per AD7608 layout guidelines-ensuring TUE ≤ ±15 LSB (±10 V range) as confirmed on the EVAL-AD7608EDZ.

What power supply requirements must be met to operate the EVAL-AD7608EDZ?

The EVAL-AD7608EDZ requires two supplies: a 4.75–5.25 V analog supply (AVCC) delivered to six dedicated pins and a 2.3–5.25 V logic supply (VDRIVE) applied to the VDRIVE pin. These match the AD7608's absolute ratings and enable full functionality-including 100 mW operational power dissipation and 25 mW standby mode-as validated on the EVAL-AD7608EDZ with no additional regulation or filtering needed beyond the onboard REGCAP networks.