Analog Devices Inc. EVAL-AD7194EBZ

Overview

EVAL-AD7194EBZ from Analog Devices is an evaluation board designed to fully characterize and prototype with the AD7194 - a 4.8 kHz, ultralow-noise, 24-bit sigma-delta ADC featuring eight differential inputs, integrated instrumentation amplifier, reference detect, and on-chip digital filtering. It supports USB-based PC control, real-time data visualization, register-level configuration, and flexible analog front-end interfacing for precision low-frequency measurement systems.

For engineers reviewing the EVAL-AD7194EBZ datasheet, EVAL-AD7194EBZ pinout, EVAL-AD7194EBZ application, or EVAL-AD7194EBZ equivalent, this board enables rapid validation of AD7194 performance in weigh scales, industrial process control, medical instrumentation, and high-resolution sensor signal chains - with LabVIEW™-based software, configurable power options (5 V USB / 3.3 V regulated / external), and BNC-accessible analog/reference inputs.

Technical Context

The EVAL-AD7194EBZ implements a complete hardware interface between a host PC and the AD7194 IC, using a Cypress CY7C68013-56LFXC USB microcontroller to bridge SPI commands and real-time ADC data. It provides selectable AVDD supply paths (USB 5 V, ADP3330-regulated 3.3 V, or external via J6) and dual reference options: internal ADR421BRZ (2.5 V) or external via SMB connectors (REFIN1±).

Board-level features include noise test circuitry (J4/J5 resistor network for AVDD/2 bias), header-based isolation (J2) for external MCU integration, and dedicated SMB sockets for AIN7, AIN8, MCLK, and REFIN1± - enabling direct connection of sensors, references, and clock sources without soldering or adapter boards.

Key Specifications

Availability

EVAL-AD7194EBZ is available at Aetrix Electronics and suitable for precision sensor evaluation, industrial DAQ prototyping, and medical device development requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for EVAL-AD7194EBZ 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.

The EVAL-AD7194EBZ belongs to Analog Devices' precision data acquisition evaluation platform family, engineered to accelerate design-in of high-resolution Σ-Δ ADCs in applications demanding sub-microvolt noise, high CMRR, and robust reference integrity.

FAQ

What is the primary function of the EVAL-AD7194EBZ?

The EVAL-AD7194EBZ is a dedicated evaluation board for the AD7194 24-bit sigma-delta ADC. It provides full hardware and software infrastructure - including USB interface, configurable power, BNC-accessible analog/reference inputs, and LabVIEW™-based control software - to evaluate, configure, and validate the AD7194's performance in precision measurement applications without custom PCB development. The EVAL-AD7194EBZ enables immediate register-level testing and real-time data analysis out of the box.

Does the EVAL-AD7194EBZ require external power, or can it run from USB alone?

The EVAL-AD7194EBZ can operate entirely from the 5 V USB supply via connector J51 - no external power is required for basic operation. A jumper (J1) selects between USB 5 V, on-board 3.3 V regulation (via ADP3330ARZ-3.3), or external DC input (via screw terminal J6). This flexibility allows users to match the AD7194's AVDD requirements precisely and isolate analog/digital domains during noise-sensitive testing.

Which software tools are compatible with the EVAL-AD7194EBZ?

The EVAL-AD7194EBZ is supported exclusively by Analog Devices' official AD7194 Evaluation Board Software (Windows® only), distributed on the included CD and available for download. This software provides real-time waveform plotting, data logging to text files, register-level ADC configuration (ADC Setup), automated quick tests (Fast 50 Hz, Low Noise), user-unit calibration, and export to Excel® or MathCAD™. No third-party IDEs or drivers are needed - the board enumerates as a standard HID-class USB device.

Can the EVAL-AD7194EBZ be used with an external microcontroller instead of a PC?

Yes - the EVAL-AD7194EBZ supports external MCU integration via header J2. Removing the default links disconnects the on-board CY7C68013 USB controller and exposes the AD7194's native SPI interface (SCLK, DIN, DOUT, CS), GPIOs (P0–P3), and power/control signals. This allows direct connection to user-designed embedded systems for firmware development, system-level validation, or integration into custom DAQ hardware - while retaining all analog front-end components (ADR421, filters, BNC inputs).

What reference voltage options does the EVAL-AD7194EBZ provide for the AD7194?

The EVAL-AD7194EBZ offers two reference configurations: (1) On-board ADR421BRZ (2.5 V, high-precision, low-drift) connected to REFIN1(±), and (2) External reference applied via SMB connectors J9 (REFIN1+) and J10 (REFIN1−), supporting user-supplied references up to ±10 V. Reference selection is software-configurable in the AD7194 Evaluation Board Software under Voltage Reference settings - no hardware modification is required to switch between sources.