Analog Devices Inc. EVAL-AD7989-5SDZ

Overview

EVAL-AD7989-5SDZ from Analog Devices is an evaluation board for the AD7989-5, a 18-bit, 500 kSPS successive approximation register (SAR) ADC with true differential input, ±V_REF range, and zero-latency architecture. It supports external reference voltages from 2.4 V to 5.1 V, operates from a single 2.5 V supply, and interfaces via SPI/QSPI/MICROWIRE-compatible serial protocol. The board enables performance validation in precision data acquisition systems requiring high dynamic range (99 dB) and low THD (−119 dB).

For engineers reviewing the EVAL-AD7989-5SDZ datasheet, EVAL-AD7989-5SDZ pinout, EVAL-AD7989-5SDZ application, or EVAL-AD7989-5SDZ equivalent, this page delivers verified hardware configuration details, interface timing constraints, reference design guidance for differential analog front-ends, and direct comparison to alternative evaluation platforms supporting 18-bit SAR ADCs at ≥500 kSPS throughput.

Technical Context

The EVAL-AD7989-5SDZ implements a complete signal chain for the AD7989-5 IC, including precision decoupling (10 µF REF capacitor), configurable logic-level interface (1.8 V–5 V VIO), and optimized layout for low-noise sampling of differential ±V_REF inputs. It supports both CS mode and daisy-chain (chain) mode operation via CNV and SDI/CS pins, with SCK timing validated down to 10.5 ns (VIO > 4.5 V).

Board-level design incorporates dedicated ground planes, matched trace lengths for IN+/IN−, and isolated power domains for analog (VDD, REF) and digital (VIO) sections. It enables accurate measurement of key AC specifications - SNR (98 dB), SINAD (97 dB), and THD (−119 dB) at f_IN = 1 kHz - under real-world PCB parasitics and thermal conditions.

Key Specifications

Availability

EVAL-AD7989-5SDZ is available at Aetrix Electronics and suitable for precision data acquisition systems, automated test equipment, and medical instrumentation requiring stable component supply, full-speed characterization, and production-ready reference design validation.

Supply support for EVAL-AD7989-5SDZ 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 (DSP) technologies, headquartered in Norwood, MA, with decades of expertise in precision data conversion and signal conditioning.

The EVAL-AD7989-5SDZ belongs to Analog Devices' precision SAR ADC evaluation platform family, engineered to accelerate development of high-fidelity, low-power measurement systems for industrial, medical, and test & measurement applications.

FAQ

What is the primary function of the EVAL-AD7989-5SDZ?

The EVAL-AD7989-5SDZ is a fully assembled and tested evaluation board designed exclusively to characterize and validate the performance of the AD7989-5 18-bit, 500 kSPS SAR ADC. It provides all necessary circuitry - including reference decoupling, level-shifted digital interface, and optimized analog routing - to measure key parameters such as INL (±2 LSB max), SNR (98 dB), and THD (−119 dB) under real-world conditions. The EVAL-AD7989-5SDZ does not contain any additional microcontroller or firmware; its sole purpose is hardware-level ADC verification.

Does the EVAL-AD7989-5SDZ support both AD7989-1 and AD7989-5 devices?

No. The EVAL-AD7989-5SDZ is specifically configured for the AD7989-5 variant, which operates at 500 kSPS with total power dissipation of 3.5 mW. While the AD7989-1 shares the same pinout and package, its lower throughput (100 kSPS) and reduced power consumption (700 µW) require different timing validation and thermal management. Analog Devices provides a separate board - EVAL-AD7989-1SDZ - for the AD7989-1. Using EVAL-AD7989-5SDZ with AD7989-1 is physically possible but invalidates published timing margins and power measurements.

Which digital interface modes are supported by the EVAL-AD7989-5SDZ?

The EVAL-AD7989-5SDZ supports three operational modes defined by the AD7989-5's CNV and SDI/CS pins: CS mode (chip-select, 3- or 4-wire), chain mode (daisy-chain), and standalone conversion triggering. All modes are accessible via onboard jumpers and test points. The board's schematic implements proper termination and signal integrity controls for SCK frequencies up to 95 MHz (10.5 ns period, VIO > 4.5 V), ensuring reliable communication with FPGAs, DSPs, and microcontrollers across 1.8 V–5 V logic families.

Can the EVAL-AD7989-5SDZ be used with external voltage references other than 5 V?

Yes. The EVAL-AD7989-5SDZ accepts external reference voltages from 2.4 V to 5.1 V on the REF pin, as specified in the AD7989-5 datasheet. The board includes a dedicated 10 µF ceramic capacitor footprint adjacent to REF and GND for optimal decoupling, and its layout maintains low-inductance paths to minimize noise coupling. Performance metrics such as dynamic range (99 dB at 5 V, 93 dB at 2.5 V) and ENOB (16.2 bits at 5 V) scale predictably with VREF, and the EVAL-AD7989-5SDZ enables direct validation of this behavior using standard lab equipment.

Is the EVAL-AD7989-5SDZ compatible with standard USB-based controller interfaces?

No. The EVAL-AD7989-5SDZ is a bare-metal evaluation platform with no integrated USB interface, microcontroller, or firmware stack. It requires connection to an external host - such as an FPGA development kit, Blackfin DSP evaluation system, or custom controller - capable of generating precise CNV pulses and managing SPI/QSPI timing per Table 4 of the AD7989-5 datasheet. Analog Devices offers complementary software tools (e.g., ACE software with compatible adapter boards) for PC-based control, but those are separate orderables, not part of the EVAL-AD7989-5SDZ itself.