Analog Devices Inc. EVAL-AD7780EBZ

Overview

EVAL-AD7780EBZ from Analog Devices is a USB-powered evaluation board designed to accelerate development and validation of the AD7780 24-bit sigma-delta ADC in low-frequency precision measurement systems. It integrates an on-board ADP3303 3.3 V regulator, Cypress CY7C68013A USB controller, and configurable link-based setup for gain (1 or 128), output data rate (10 Hz or 16.7 Hz), reference selection, and load cell interfacing - enabling rapid prototyping of bridge sensor front ends.

For engineers reviewing the EVAL-AD7780EBZ datasheet, EVAL-AD7780EBZ pinout, EVAL-AD7780EBZ application, or EVAL-AD7780EBZ equivalent, this board supports hands-on characterization of noise performance (44 nV rms at 10 Hz/128 gain), simultaneous 50 Hz/60 Hz rejection, ±VREF or ±VREF/128 input range, and LabVIEW™-based weighscale demo functionality - all without external clocking or power supplies.

Technical Context

The EVAL-AD7780EBZ implements a complete hardware interface between a PC and the AD7780 ADC via a Cypress CY7C68013A USB microcontroller operating in slave FIFO mode, with SPI bridging to the AD7780. Configuration is managed through 16 user-configurable jumpers (LK1–LK16) that set analog input routing, reference source (AVDD or external), AVDD supply path (USB 5 V, ADP3303 3.3 V, or external), serial interface enablement, bridge power-down control, and ADC operating parameters.

It features dual analog input paths: SMB connectors (AIN+, AIN−, REFIN+, REFIN−) for bench testing and a 6-pin terminal block (J4) for direct load cell integration. The board includes on-board 24 MHz crystal timing for the USB controller and supports both standalone noise analysis (via internal AVDD/2 shorting) and real-world transducer signal acquisition under controlled gain and data rate settings.

Key Specifications

Availability

EVAL-AD7780EBZ is available at Aetrix Electronics and suitable for precision weighscale development, bridge sensor system validation, and low-frequency industrial measurement applications requiring stable component supply and rapid functional verification.

Supply support for EVAL-AD7780EBZ 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-AD7780EBZ belongs to Analog Devices' precision data acquisition evaluation platform family, engineered specifically to simplify adoption of low-power, high-resolution sigma-delta ADCs in sensor front-end designs for industrial and instrumentation applications.

FAQ

What is the primary function of the EVAL-AD7780EBZ?

The EVAL-AD7780EBZ is a dedicated evaluation board for the AD7780 24-bit sigma-delta ADC. It provides a fully configured hardware and software environment to evaluate the ADC's performance - including gain, data rate, noise, and 50/60 Hz rejection - using USB connectivity, configurable jumpers, and LabVIEW-based GUI tools. The EVAL-AD7780EBZ does not operate as a standalone product but serves exclusively as a development aid for the AD7780BRZ.

Does the EVAL-AD7780EBZ require an external power supply?

No - the EVAL-AD7780EBZ is powered directly from the host PC's USB port (5 V via J1). An optional external 3 V or 5 V supply can be connected via terminal block J2, but it is not required. The board includes an onboard ADP3303 3.3 V regulator to power the AD7780 and USB interface circuitry, eliminating need for additional regulators during evaluation.

How is the AD7780's gain and output data rate configured on the EVAL-AD7780EBZ?

Gain (1 or 128) and output data rate (10 Hz or 16.7 Hz) are set using physical jumpers: LK16 selects gain, and LK15 selects data rate. These links must be manually configured before operation - no software register writes override these hardware settings. The EVAL-AD7780EBZ GUI displays the currently selected values but does not change them dynamically.

Can the EVAL-AD7780EBZ interface with a load cell?

Yes - the EVAL-AD7780EBZ includes a 6-pin Phoenix terminal block (J4) and dedicated bridge power-down switch circuitry (controlled by LK12–LK14) to connect and condition 6-wire load cells. The included weighscale demo software performs zero-scale and full-scale calibration, converts codes to weight units, and supports real-time monitoring - making the EVAL-AD7780EBZ suitable for prototype weighscale system validation.

Is the EVAL-AD7780EBZ compatible with modern Windows operating systems?

Yes - the EVAL-AD7780EBZ software is compatible with Windows 7, 8, 10, and 11 (32- and 64-bit). Driver installation may require "Install driver software anyway" confirmation during first connection due to unsigned legacy drivers. Once installed, the EVAL-AD7780EBZ appears as "AD779x Evaluation Board" in Device Manager and functions seamlessly with the provided GUI and weighscale demo.