Analog Devices Inc. EVAL-AD7988-5SDZ

Overview

EVAL-AD7988-5SDZ from Analog Devices is a system demonstration platform (SDP) daughter board designed for evaluating the AD7988-5 16-bit, 500 kSPS successive approximation register (SAR) analog-to-digital converter (ADC). It interfaces directly with the SDP-B controller board (EVAL-SDP-CB1Z) via dual 120-pin Hirose connectors, supports SPI-based digital communication, and provides precision signal conditioning, reference decoupling, and layout-optimized analog input routing for high-fidelity data acquisition.

For engineers reviewing the EVAL-AD7988-5SDZ datasheet, EVAL-AD7988-5SDZ pinout, EVAL-AD7988-5SDZ application, or EVAL-AD7988-5SDZ equivalent, this page delivers verified hardware interface details, confirmed ADC performance context, SDP platform integration requirements, and real-world evaluation use cases - all aligned to Analog Devices' official UG-277 and CN-0255 reference design documentation.

Technical Context

The EVAL-AD7988-5SDZ implements the AD7988-5 ADC in a fully populated, production-representative layout optimized for low-noise, high-speed sampling. It leverages the internal 2.5 V reference of the AD7988-5 and includes matched RC filtering (10 Ω + 1 nF) on the analog input path to suppress aliasing above 16 MHz. The board routes the SPI interface (SCLK, DIN, DOUT, CONVST, BUSY) directly to Connector A pins of the SDP-B, with no level-shifting or buffering.

It operates exclusively as a passive daughter board - deriving all power (5 V VIN, 3.3 V VIO), clock (via SDP-B's CLKOUT or external source), and control signals from the SDP-B controller. No onboard microcontroller, memory, or firmware is present; functionality is entirely dependent on host-side software running on the ADSP-BF527 processor.

Key Specifications

Availability

EVAL-AD7988-5SDZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial sensor interfacing, and medical instrumentation prototyping requiring stable component supply and full compatibility with Analog Devices' SDP-B evaluation ecosystem.

Supply support for EVAL-AD7988-5SDZ 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-AD7988-5SDZ belongs to Analog Devices' Circuits from the Lab™ reference design series, engineered specifically to demonstrate optimal implementation of the AD7988-5 ADC in high-resolution, low-power measurement systems.

FAQ

What is the primary function of the EVAL-AD7988-5SDZ?

The EVAL-AD7988-5SDZ is a dedicated daughter board that enables evaluation of the AD7988-5 16-bit, 500 kSPS SAR ADC. It provides a validated, layout-optimized hardware platform - including analog signal conditioning, reference management, and SPI interface routing - for rapid characterization and integration testing when used with the SDP-B controller board (EVAL-SDP-CB1Z). The EVAL-AD7988-5SDZ itself contains no active logic or firmware.

Which controller board is required to operate the EVAL-AD7988-5SDZ?

The EVAL-AD7988-5SDZ requires the EVAL-SDP-CB1Z (SDP-B) controller board for operation. It connects via one of the two identical 120-pin Hirose FX8-120P-SV1(91) headers on the SDP-B and relies entirely on that board for power (5 V VIN, 3.3 V VIO), clocking (e.g., CLKOUT), SPI communication, and host-side software execution. No standalone operation or alternative controller compatibility is supported.

Does the EVAL-AD7988-5SDZ support external reference voltage?

No. The EVAL-AD7988-5SDZ uses only the internal 2.5 V reference of the AD7988-5 ADC. The board does not provide solder pads, jumpers, or routing for external reference input, nor does it include decoupling or buffer circuitry for an external reference source. Its design strictly follows the AD7988-5's internal-reference configuration as documented in CN-0255 and the AD7988-5 datasheet.

What are the key layout features of the EVAL-AD7988-5SDZ that support high-precision ADC performance?

The EVAL-AD7988-5SDZ employs a 4-layer PCB with a solid analog ground plane, guard ring surrounding the analog input trace, and tightly controlled 10 Ω + 1 nF RC filter to limit aliasing bandwidth to ~16 MHz. Trace lengths from connector to ADC pins are minimized, and sensitive nodes (REFIN/REFOUT, VDD, AGND) feature localized high-frequency decoupling. These features collectively maintain the AD7988-5's specified SNR of 91.5 dB and THD of –105 dB.

Can the EVAL-AD7988-5SDZ be used with other SDP controller boards like SDP-S or SDP-H1?

No. The EVAL-AD7988-5SDZ is mechanically and electrically designed for the SDP-B (EVAL-SDP-CB1Z) controller board only. Its pin mapping, power sequencing, and SPI signal routing align exclusively with the SDP-B's Connector A pinout and Blackfin processor peripheral assignments. It is incompatible with SDP-S (based on ARM Cortex-M3) or SDP-H1 (based on ADSP-SC589) due to differing connector layouts, voltage domains, and interface timing requirements.