Analog Devices Inc. EVAL-AD7793EBZ

Overview

EVAL-AD7793EBZ from Analog Devices is a fully featured USB-powered evaluation board for the AD7793 - a 24-bit, low-power, sigma-delta analog-to-digital converter with three differential input channels, integrated instrumentation amplifier, on-chip reference, and programmable current sources. It supports update rates from 4.17 Hz to 470 Hz and delivers 85 nV rms noise at 16.7 Hz with gain = 64.

For engineers reviewing the EVAL-AD7793EBZ datasheet, EVAL-AD7793EBZ pinout, EVAL-AD7793EBZ application, or EVAL-AD7793EBZ equivalent, this board enables rapid functional validation of the AD7793 in precision low-frequency measurement systems including temperature sensing, weigh scales, and industrial process monitoring - with no external clock or power supply required.

Technical Context

The EVAL-AD7793EBZ implements a complete hardware interface between a PC and the AD7793 IC, using a Cypress CY7C68013A-56LFXC USB controller for SPI-to-USB bridging. It integrates an ADP3303ARZ-3.3 low-dropout regulator to generate clean 3.3 V AVDD, and includes SMB connectors for AIN1±, REFIN1±, and CLK, plus a 16-pin header (J2) for custom signal routing.

On-board configuration links (LK1–LK7) enable flexible setup of reference selection (internal/external), input channel routing, thermistor-based temperature demo, and power source (USB 5 V / ADP3303 3.3 V / external supply via J3). The board ships with LabVIEW-based software supporting register-level control, real-time waveform/histogram display, and ratiometric temperature conversion using a 1 kΩ thermistor and 5 kΩ precision resistor.

Key Specifications

Availability

EVAL-AD7793EBZ is available at Aetrix Electronics and suitable for precision sensor evaluation, industrial data acquisition prototyping, and low-frequency ADC qualification requiring stable component supply and full technical documentation support.

Supply support for EVAL-AD7793EBZ 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, communications, automotive, and healthcare markets since 1965.

The EVAL-AD7793EBZ belongs to Analog Devices' precision ADC evaluation platform family, designed specifically to accelerate development of high-resolution, low-noise measurement systems for weight, temperature, pressure, and strain sensing applications.

FAQ

What is the primary function of the EVAL-AD7793EBZ?

The EVAL-AD7793EBZ is a dedicated evaluation board for the AD7793 24-bit sigma-delta ADC. It provides a complete, USB-powered test environment with LabVIEW-based software, enabling engineers to configure registers, acquire analog data from up to three differential channels, perform noise analysis, and validate ratiometric temperature measurements - all without requiring external clocks or power supplies. The EVAL-AD7793EBZ simplifies early-stage design verification of the AD7793 in precision measurement applications.

Does the EVAL-AD7793EBZ require an external power supply?

No - the EVAL-AD7793EBZ is fully powered via the USB Mini-B connector (J1), drawing 5 V directly from the host PC. An on-board ADP3303ARZ-3.3 regulator generates clean 3.3 V AVDD for the AD7793. External 3 V or 5 V power can be applied via terminal block J3 only if needed for specific test conditions, but it is not required for standard operation of the EVAL-AD7793EBZ.

How does the EVAL-AD7793EBZ support temperature measurement?

The EVAL-AD7793EBZ includes a dedicated temperature demonstration circuit using a 1 kΩ thermistor (R1) and 5 kΩ precision reference resistor (R2). When links LK2–LK6 are installed, the AD7793's internal 210 µA current source excites the thermistor, and the resulting voltage across AIN2± is measured ratiometrically against the reference. The included software performs real-time temperature conversion using a built-in look-up table - a validated use case implemented directly on the EVAL-AD7793EBZ hardware.

Can the EVAL-AD7793EBZ be used with other ADCs besides the AD7793?

No - the EVAL-AD7793EBZ is mechanically and electrically optimized exclusively for the AD7793BRUZ in TSSOP-24 package. Its layout, component selection (e.g., ADP3303 regulator, SMB connectors for AIN1±/REFIN1±), and firmware are fixed to match the AD7793's pinout, timing, register map, and analog front-end requirements. It is not compatible with other ADC families or even pin-compatible variants such as the AD7792. The EVAL-AD7793EBZ serves only the AD7793.

Is software provided with the EVAL-AD7793EBZ, and what does it do?

Yes - the EVAL-AD7793EBZ ships with Windows-based evaluation software that communicates with the board via USB. It provides full register-level access (Configuration, Mode, IO, Offset, Full-Scale), real-time waveform and histogram visualization, noise analysis tools, and a dedicated Temperature Demo mode. The software preconfigures the EVAL-AD7793EBZ at startup with gain = 64, internal reference, AIN1± channel, and 16.7 Hz update rate - enabling immediate functional validation of the AD7793 without manual setup.