Analog Devices Inc. EVAL-AD7792EBZ

Overview

EVAL-AD7792EBZ from Analog Devices is a USB-powered evaluation board designed for the AD7792 16-bit, low-power sigma-delta ADC with three differential analog input channels, on-board 3.3 V regulator (ADP3303ARZ-3.3), and integrated temperature demonstration circuit using a 1 kΩ thermistor and 5 kΩ precision reference resistor - used for validating low-frequency sensor signal conditioning in industrial and instrumentation systems.

For engineers reviewing the EVAL-AD7792EBZ datasheet, EVAL-AD7792EBZ pinout, EVAL-AD7792EBZ application, or EVAL-AD7792EBZ equivalent, this board supports rapid functional validation of the AD7792's ratiometric temperature measurement, programmable gain (1–128), 4.17–470 Hz update rate, internal/external reference selection, and SPI/USB interface configuration without custom hardware.

Technical Context

The EVAL-AD7792EBZ implements a complete test environment for the AD7792, including SMB connectors for AIN1±, REFIN1±, and CLK; a 16-pin header (J2) for prototype signal injection; and configurable link settings (LK1–LK7) to select power source (USB 5 V, ADP3303 3.3 V, or external supply via J3), reference mode, and thermistor interface routing.

It integrates Cypress CY7C68013A-56LFXC as the USB-to-SPI bridge controller, Microchip 24LC64-I/SN EEPROM for board identification, and a 24 MHz crystal (X24M000000S244) for precise timing - enabling deterministic communication and synchronized sampling independent of host PC clock jitter.

Key Specifications

Availability

EVAL-AD7792EBZ is available at Aetrix Electronics and suitable for industrial sensor calibration, precision temperature monitoring, and low-frequency data acquisition system prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for EVAL-AD7792EBZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The EVAL-AD7792EBZ belongs to Analog Devices' precision data acquisition evaluation platform family, engineered specifically to accelerate development of low-power, high-resolution sensor interfaces for weigh scales, medical instruments, and environmental monitoring systems.

FAQ

What is the primary function of the EVAL-AD7792EBZ?

The EVAL-AD7792EBZ is a dedicated evaluation board for the AD7792 16-bit sigma-delta ADC. It provides a fully assembled, USB-powered platform with SMB analog inputs, configurable links, and LabVIEW-based software to validate the AD7792's performance in low-frequency measurement applications - including ratiometric temperature sensing and high-precision DC signal acquisition. The EVAL-AD7792EBZ does not replace production hardware but enables rapid functional verification before system integration.

Does the EVAL-AD7792EBZ require an external power supply?

No - the EVAL-AD7792EBZ is powered directly via the USB Mini-B connector (J1), delivering 5 V to the board. An on-board ADP3303ARZ-3.3 regulator generates clean 3.3 V for the AD7792's AVDD when LK7 is set to Position B. External power (3 V or 5 V) can be applied via terminal block J3 only if LK7 is set to Position A, making external supply optional, not required. USB power alone suffices for all standard evaluations.

How is the temperature demonstration circuit implemented on the EVAL-AD7792EBZ?

The EVAL-AD7792EBZ implements a self-contained temperature demo using a 1 kΩ thermistor (B57620C102J62) connected across AIN2± and a 5 kΩ ±0.1% precision resistor (RN73C2A4K99BTG) for ratiometric reference generation. When LK2–LK6 are installed, the AD7792's internal 210 μA current source excites the thermistor, and the software converts raw codes to temperature using a lookup table - eliminating dependency on absolute reference stability. This configuration is validated in the Temp Demo window of the EVAL-AD7792EBZ software.

Which software tools are included with the EVAL-AD7792EBZ?

The EVAL-AD7792EBZ ships with Windows-compatible LabVIEW-based software that provides real-time register access (Configuration, Mode, IO), temperature demonstration mode, noise analysis (via Sample/Continuous functions), waveform/histogram visualization, and export to Excel or MathCAD. The software preconfigures the AD7792 to gain = 64, update rate = 16.7 Hz, internal reference, and AIN1± channel on startup - allowing immediate evaluation without manual setup. Installation must precede physical connection to ensure proper USB device enumeration.

Can the EVAL-AD7792EBZ be used to evaluate external references with the AD7792?

Yes - the EVAL-AD7792EBZ includes dedicated SMB connectors (REFIN1+, REFIN1−) for injecting an external reference voltage into the AD7792. When LK2 and LK3 are removed and the software's Reference setting is changed to "External", the AD7792 uses the applied voltage instead of its internal 1.17 V reference. The External Reference text box in the software allows entry of the actual reference value for accurate voltage-code conversion - supporting validation of reference sensitivity, PSRR, and ratiometric vs. absolute measurement trade-offs.