Analog Devices Inc. EVAL-AD1974AZ

Overview

EVAL-AD1974AZ from Analog Devices is an evaluation board designed to demonstrate and validate the AD1974 four-channel, 24-bit, 192 kHz audio codec IC. It supports standalone operation (I²S master/slave), SPI-controlled register programming, and flexible clock routing via MCLK sources including on-board oscillator, passive crystal, or external inputs. The board enables full characterization of ADC performance, S/PDIF transmission, and serial audio interface timing under ±12 V dc power.

For engineers reviewing the EVAL-AD1974AZ datasheet, EVAL-AD1974AZ pinout, EVAL-AD1974AZ application, or EVAL-AD1974AZ equivalent, this page provides verified setup guidance for AD1974 register control, MCLK/PLL configuration, analog input buffering, S/PDIF transmitter validation, and HDR1/HDR2 serial audio routing - all critical for professional audio system prototyping and codec integration.

Technical Context

The EVAL-AD1974AZ implements a dual-path analog signal chain: two stereo 3.5 mm TRS inputs feed differential ADC buffers with selectable VREF (GND/CM/FILTR), while on-board regulators generate independent 3.3 V AVDD and DVDD rails for the AD1974. A CPLD (MACH4A5-64) handles dynamic clock/data routing between AD1974, CS8416 S/PDIF receiver, CS8406 S/PDIF transmitter, and HDR1/HDR2 headers.

Control is implemented via SPI using the included USBi interface board (EVAL-ADUSB2EBZ), with GUI-based Automated Register Window Builder software enabling live register writes to configure sample rates (48/96/192 kHz), PLL source (MCLK or LRCLK), serial format (I²S/TDM/stereo), and clock direction (master/slave) per ADC/DAC port.

Key Specifications

Availability

EVAL-AD1974AZ is available at Aetrix Electronics and suitable for professional audio codec evaluation, S/PDIF transmitter validation, high-resolution ADC performance testing, and embedded digital audio system prototyping requiring stable component supply and full documentation support.

Supply support for EVAL-AD1974AZ 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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial applications.

EVAL-AD1974AZ belongs to ADI's Audio Evaluation Platform family, engineered to accelerate development of multichannel audio systems using their high-fidelity codecs like the AD1974 - targeting broadcast, studio, and pro-audio equipment design.

FAQ

What is the primary function of the EVAL-AD1974AZ evaluation board?

The EVAL-AD1974AZ evaluation board is a complete hardware platform for evaluating the AD1974 four-channel, 24-bit, 192 kHz audio codec IC. It provides analog input buffering, S/PDIF transmit/receive capability, flexible serial audio routing via HDR1/HDR2 headers, and SPI-based register control through the USBi interface. The board enables full functional and performance validation of the AD1974 in real-world audio system configurations.

Does the EVAL-AD1974AZ include the AD1974 IC and supporting hardware?

Yes, the EVAL-AD1974AZ package includes the AD1974 evaluation board itself, the USBi control interface board (EVAL-ADUSB2EBZ), a USB cable, and access to the AD1974 data sheet and UG-046 user guide. All required components for immediate evaluation - including on-board regulators, clock sources, analog buffers, and digital interfaces - are integrated into the board.

How is the EVAL-AD1974AZ powered, and what voltage rails does it generate?

The EVAL-AD1974AZ requires external ±12 V dc power supplied via three binding posts. On-board regulators derive two independent 3.3 V supplies: one for AVDD (analog section of the AD1974) and one for DVDD (digital section and peripheral logic). Jumpers JP5–JP7 provide test points for current measurement directly at the AD1974 power pins.

Can the EVAL-AD1974AZ operate without a PC connection?

Yes, the EVAL-AD1974AZ supports standalone operation using DIP switches (S2/S3), rotary hex switches (S4/S5), and jumpers (J5–J8). In standalone mode, the AD1974 defaults to I²S master at 48 kHz with 256×fS MCLK, driving BCLK/LRCLK to the S/PDIF transmitter and HDR1 header. No PC or USBi is needed for basic functionality.

What software is required to program the AD1974 registers via the EVAL-AD1974AZ?

The Automated Register Window Builder (ARWB) software is required. It is a Windows GUI application that communicates with the AD1974 via the USBi interface. The AD1974-specific configuration (.xml) file must be installed in the C:\Program Files\Analog Devices Inc\AutomatedRegWin folder. ARWB enables live read/write access to all AD1974 registers, including PLL, clock, format, and control settings.