Analog Devices Inc. EVAL-AD7719EBZ

Overview

EVAL-AD7719EBZ from Analog Devices is a full-featured evaluation board for the AD7719 16-/24-bit dual sigma-delta ADC, supporting low-frequency precision measurement applications with on-board 2.5 V AD780 references, 32.768 kHz crystal clock source, and buffered serial interface to PC via parallel port.

For engineers reviewing the EVAL-AD7719EBZ datasheet, EVAL-AD7719EBZ pinout, EVAL-AD7719EBZ application, or EVAL-AD7719EBZ equivalent, this board enables rapid functional validation, register-level control, noise analysis, and dual-ADC synchronization testing of the AD7719 in transducer interface, industrial sensor conditioning, and calibration-critical analog front-end designs.

Technical Context

The EVAL-AD7719EBZ implements direct hardware interfacing to the AD7719's serial interface (SCLK, DIN, DOUT, CS, RDY, RESET, SYNC) using 74HC4050N, 74C08SMD, and 74ACT244 buffers, with configurable link options (LK1–LK14) for analog input routing, reference selection (REFIN1±, REFIN2), and master clock source (on-board crystal or external SMB input SKT7).

It provides six SMB sockets (SKT1–SKT6) for AIN1–AIN6 analog inputs, two AD780AN precision 2.5 V references (U2, U6), dual current sources (IOUT1/IOUT2 accessible via SKT12/SKT13), and programmable I/O ports (P1–P4) with power-switch capability - all controllable via Windows-based software that reads/writes AD7719 registers including Filter, Mode, Calibration, and I/O Control registers.

Key Specifications

Availability

EVAL-AD7719EBZ is available at Aetrix Electronics and suitable for precision sensor interface validation, industrial data acquisition prototyping, and sigma-delta ADC performance benchmarking requiring stable component supply and full technical documentation support.

Supply support for EVAL-AD7719EBZ 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 Wilmington, MA.

The EVAL-AD7719EBZ belongs to Analog Devices' precision data conversion evaluation platform family, designed specifically to accelerate development of low-noise, low-drift measurement systems using their sigma-delta ADCs in industrial, scientific, and test equipment applications.

FAQ

What is the primary function of the EVAL-AD7719EBZ?

The EVAL-AD7719EBZ is an evaluation board purpose-built to validate and characterize the AD7719 16-/24-bit dual sigma-delta ADC. It provides complete hardware interface, on-board precision references, configurable clocking, and Windows-based software for register-level control, dual-ADC sampling, and noise analysis - enabling rapid prototyping of precision analog front ends without custom PCB design. The EVAL-AD7719EBZ supports both main and auxiliary ADC channels simultaneously.

Which interfaces does the EVAL-AD7719EBZ use to connect to a host system?

The EVAL-AD7719EBZ connects to a host PC via a standard 36-way Centronics (printer) cable to J1, using the PC's parallel port. It also offers a 9-pin D-sub (J4) interface for integration into custom digital systems. Both interfaces route buffered SCLK, DIN, DOUT, CS, RDY, RESET, and SYNC signals to the AD7719. No USB or Ethernet interface is provided - communication relies entirely on parallel-port-driven serial protocol managed by the included software.

Does the EVAL-AD7719EBZ include on-board voltage references?

Yes, the EVAL-AD7719EBZ integrates two AD780AN precision 2.5 V references: U6 supplies REFIN1(+) and U2 supplies REFIN2. LK9–LK10 and LK14 links allow flexible configuration - including grounding REFIN1(−), selecting external references via SKT14/SKT15/SKT16, or using IOUT1×R10 as a programmable reference. These references are decoupled with 10 µF tantalum and 0.1 µF ceramic capacitors placed near the AD7719 and reference ICs.

Can the EVAL-AD7719EBZ evaluate both ADC channels of the AD7719 simultaneously?

Yes, the EVAL-AD7719EBZ fully supports concurrent operation of the AD7719's main (24-bit) and auxiliary (16-bit) sigma-delta ADCs. Its bundled Windows software includes a "Read Dual ADC" function that acquires synchronized samples from both channels, stores them in separate arrays, and enables comparative noise analysis, histogram generation, and time-domain graphing - all without modifying hardware or firmware. The RDY pin reflects activity from either or both ADCs depending on enable status.

What power supply requirements does the EVAL-AD7719EBZ have?

The EVAL-AD7719EBZ requires two isolated DC supplies: +5 V applied between AVDD and AGND for analog circuitry (AD7719 core, references, crystal), and +5 V applied between DVDD and DGND for digital buffers (U3–U5). AGND and DGND are internally joined only at the AD7719 GND pin - external shorting is discouraged. Decoupling uses 10 µF tantalum + 0.1 µF ceramic at board inputs and 0.1 µF ceramics near each logic device and the AD7719.