Analog Devices Inc. EVAL-AD7998EBZ

Overview

EVAL-AD7998EBZ from Analog Devices is a fully featured evaluation board for the AD7998 - an 8-channel, 12-bit, I²C-compatible successive approximation ADC operating from 2.7 V to 5.5 V with 2 μs conversion time and 11 MHz input bandwidth. It integrates on-board signal conditioning (eight AD8691 op amps), dual AD5245 digital potentiometers, AD780 precision reference (2.5 V/3 V selectable), and TMP37 temperature sensor for comprehensive analog front-end testing.

For engineers reviewing the EVAL-AD7998EBZ datasheet, EVAL-AD7998EBZ pinout, EVAL-AD7998EBZ application, or EVAL-AD7998EBZ equivalent, this board enables rapid functional validation of the AD7998 in multi-channel sensor acquisition, industrial monitoring, and embedded data logging systems - with USB-controlled sampling, real-time DSO visualization, and configurable analog input paths via 27 jumper links.

Technical Context

The EVAL-AD7998EBZ implements a complete test environment for the AD7998 ADC, supporting all eight analog inputs (VIN1–VIN8) via SMB connectors (AN0–AN7) and flexible signal routing through digital potentiometers and op-amp buffers. Power is supplied via USB (5 V) or regulated 3.3 V (ADP3303), with LK7 selecting the ADC's VDD source and LK9 selecting its reference (AD780 or 5 V).

On-board Cypress USB microcontroller (U1) handles host communication, firmware loading, and I²C bridging to the AD7998. Software provides channel selection, continuous/sweep sampling, code/volt display, limit checking, and temperature readout - all synchronized to the AD7998's native I²C timing and conversion modes.

Key Specifications

Availability

EVAL-AD7998EBZ is available at Aetrix Electronics and suitable for industrial sensor interface validation, embedded ADC characterization, and R&D prototyping requiring stable component supply and full documentation support.

Supply support for EVAL-AD7998EBZ 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-AD7998EBZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed specifically to accelerate development with low-power, multi-channel SAR ADCs in test, measurement, and condition-monitoring applications.

FAQ

What is the primary function of the EVAL-AD7998EBZ?

The EVAL-AD7998EBZ is a dedicated evaluation board for the AD7998 8-channel, 12-bit I²C ADC. It provides hardware and software infrastructure to configure, control, and validate the AD7998's performance - including analog input routing, reference selection, power options, and real-time sampling visualization - without requiring custom PCB design. The EVAL-AD7998EBZ enables immediate functional verification in lab and development environments.

Does the EVAL-AD7998EBZ support both AD7997 and AD7998 devices?

Yes, the EVAL-AD7998EBZ is shared with the AD7997 and supports both devices per the official Analog Devices documentation. However, the board is configured and tested for the AD7998BRUZ-0 (12-bit version) as the default target IC. When used with the AD7997 (10-bit), software displays resolution-appropriate codes, and all hardware features - including 8-channel multiplexing, I²C interface, and on-board signal conditioning - remain fully operational for either device.

How is the EVAL-AD7998EBZ powered, and what are the voltage options for the AD7998?

The EVAL-AD7998EBZ draws power exclusively from the USB connector (J1, 5 V). The AD7998 itself can be powered from either that 5 V supply or a regulated 3.3 V output from the on-board ADP3303 LDO - selected by jumper LK7. This dual-supply flexibility allows users to evaluate the AD7998 under both nominal (5 V) and low-voltage (3.3 V) conditions while maintaining full functionality and specified performance.

What reference voltage options does the EVAL-AD7998EBZ provide for the AD7998?

The EVAL-AD7998EBZ offers two reference sources for the AD7998: the precision AD780 bandgap reference (2.5 V or 3 V, selected via LK8 insertion) or the 5 V USB supply - selected via LK9 position. This enables accurate full-scale testing across common reference standards and supports ratio-metric or absolute measurement configurations depending on system requirements.

Can the EVAL-AD7998EBZ be used for production systems?

No - the EVAL-AD7998EBZ is explicitly intended for evaluation and development only, not for production use. Analog Devices states it is supplied "as is" without warranties, and prohibits use in life-support devices or systems. Its design prioritizes test flexibility (e.g., jumpers, sockets, op-amp buffers) over reliability, thermal management, or long-term stability required in production hardware. For deployment, users must design their own PCB based on the AD7998's datasheet specifications.