Analog Devices Inc. EVAL-AD7994EBZ

Overview

EVAL-AD7994EBZ from Analog Devices is a full-featured evaluation board for the AD7994 4-channel, 12-bit I²C-compatible successive approximation ADC. It supports single-supply operation from 2.7 V to 5.5 V, delivers 2 μs conversion time, and includes on-board AD8691 op amps, AD5245 digital potentiometers, AD780 precision reference, and TMP37 temperature sensor for comprehensive signal conditioning and measurement validation.

For engineers reviewing the EVAL-AD7994EBZ datasheet, EVAL-AD7994EBZ pinout, EVAL-AD7994EBZ application, or EVAL-AD7994EBZ equivalent, this board enables rapid functional verification of the AD7994 in mixed-signal systems requiring precise analog input sampling, I²C-based host integration, and configurable reference/voltage scaling - especially during early-stage sensor interface and data acquisition prototyping.

Technical Context

The EVAL-AD7994EBZ implements a complete test environment for the AD7994 ADC, integrating USB communication via a Cypress microcontroller (U1), on-board 3.3 V and 5 V regulated supplies (ADP3330/ADP3303), and flexible analog front-end routing through 14 configurable jumpers (LK1–LK15). Input channels VIN1–VIN4 are accessible via SMB connectors (AN0–AN3) and support direct connection, digital potentiometer scaling, or op-amp buffering.

Reference configuration is fully adjustable: LK8 selects 2.5 V or 3 V output from the AD780, while LK9 chooses between AD780 or 5 V USB supply as REF_IN source. The board supports both single-shot and continuous sampling modes, with software-controlled sweep functionality across all four channels using the included Windows PC application.

Key Specifications

Availability

EVAL-AD7994EBZ is available at Aetrix Electronics and suitable for sensor interface validation, industrial data acquisition prototyping, and embedded I²C ADC integration requiring stable component supply and traceable evaluation hardware.

Supply support for EVAL-AD7994EBZ 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 ICs, headquartered in Norwood, MA, with decades of expertise in precision data conversion and sensor signal chains.

The EVAL-AD7994EBZ belongs to Analog Devices' precision ADC evaluation platform family, designed specifically to accelerate development of low-power, multi-channel I²C-based measurement systems in industrial, instrumentation, and condition-monitoring applications.

FAQ

What is the primary function of the EVAL-AD7994EBZ?

The EVAL-AD7994EBZ is an evaluation board intended solely for functional testing and characterization of the AD7994 4-channel, 12-bit I²C-compatible ADC. It provides a complete hardware and software environment-including USB interface, configurable analog front-end, precision reference, and PC software-to validate timing, accuracy, linearity, and I²C communication behavior before system integration. It is not certified for production use.

Does the EVAL-AD7994EBZ support both AD7993 and AD7994 devices?

Yes, the EVAL-AD7994EBZ shares the same hardware platform as the EVAL-AD7993EBZ and is designed to evaluate both the AD7993 (10-bit) and AD7994 (12-bit) variants. The board's U12 socket accommodates either device, and the included software automatically detects resolution and configures display units (codes or volts) accordingly.

How is power supplied to the EVAL-AD7994EBZ and the AD7994 under test?

The EVAL-AD7994EBZ receives power exclusively via the USB mini-B connector (J1), delivering 5 V to the board. That 5 V can directly power the AD7994 through the EMC filter, or be regulated down to 3.3 V using the on-board ADP3303 LDO. Selection between 5 V (LK7-A) and 3.3 V (LK7-B) is made via jumper LK7, enabling validation under both supply conditions specified in the AD7994 datasheet.

Can the EVAL-AD7994EBZ measure temperature directly?

Yes - the EVAL-AD7994EBZ integrates the TMP37GRTZ-REEL7 precision temperature sensor (U7), which connects to VIN4 via jumper LK15 position C. When configured this way and enabled in software, the AD7994 digitizes the TMP37's analog output, allowing real-time ambient temperature monitoring with ±1°C accuracy over 5°C to 100°C, independent of external sensors.

What software tools are provided with the EVAL-AD7994EBZ?

The EVAL-AD7994EBZ ships with a dedicated Windows application that provides real-time sampling control, digital storage oscilloscope (DSO) visualization, channel selection, reference voltage switching (Ref/VDD/5V), potentiometer value adjustment, and sweep mode (256-point linear ramp). The software also supports data export, chart autoscaling, limit alerts, and firmware loading for the Cypress USB controller.