Texas Instruments DEM-DAI1804

Overview

DEM-DAI1804 from Texas Instruments is an evaluation module for the SRC4392 two-channel asynchronous sample rate converter IC, integrating digital audio interface receiver (DIR), transmitter (DIT), and dual audio serial ports. It supports sampling rates up to 216 kHz, delivers 144 dB A-weighted dynamic range, –140 dB THD+N at full scale, and features differential line receivers, AES3/S/PDIF compatibility, and programmable SPI/I²C host interface.

For engineers reviewing the DEM-DAI1804 datasheet, DEM-DAI1804 pinout, DEM-DAI1804 application, or DEM-DAI1804 equivalent, this module enables rapid validation of SRC4392-based audio routing, broadcast-grade sample rate conversion, jitter-sensitive digital audio interconnects, and multi-format digital interface bridging in professional audio systems.

Technical Context

The DEM-DAI1804 implements a complete reference design for the SRC4392, including its QFN-40 or TQFP-48 footprint, all required power sequencing (1.8 V core, 3.3 V I/O, 3.3 V analog), and signal-conditioned AES3/S/PDIF input/output paths with transformer-coupled differential drivers and receivers. It routes all four DIR line inputs, both audio serial ports (A/B), DIT outputs, and control interfaces to accessible headers and test points.

It provides on-board crystal oscillators for MCLK and RXCKI, configurable jumpers for SPI/I²C mode selection, GPO-controlled mute/reset functions, and buffered analog ground isolation between DIR/DIT sections - directly supporting evaluation of SRC4392's wide input-to-output conversion ratio (16:1 to 1:16), automatic non-PCM stream detection (IEC 61937), and Q-channel subcode decoding.

Key Specifications

Availability

DEM-DAI1804 is available at Aetrix Electronics and suitable for digital audio recorder development, broadcast studio equipment integration, surround sound decoder prototyping, and automotive infotainment system validation requiring stable component supply and verified reference design support.

Supply support for DEM-DAI1804 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and communications applications.

The DEM-DAI1804 belongs to TI's Audio Evaluation Modules product line, designed to accelerate development of high-fidelity, multi-standard digital audio systems using TI's precision audio converters and interface ICs.

FAQ

What is the primary function of the DEM-DAI1804 evaluation module?

The DEM-DAI1804 evaluation module is a hardware platform built specifically to evaluate the SRC4392 two-channel asynchronous sample rate converter IC. It provides full access to all SRC4392 interfaces-including DIR, DIT, dual audio serial ports, and SPI/I²C control-enabling engineers to validate sample rate conversion performance, AES3/S/PDIF interoperability, jitter attenuation, and system-level integration without custom PCB design. The DEM-DAI1804 does not operate independently; it requires connection to a host controller and external audio sources/sinks to exercise the SRC4392 functionality.

Does the DEM-DAI1804 support both QFN-40 and TQFP-48 versions of the SRC4392?

Yes, the DEM-DAI1804 board is designed to accommodate both the SRC4392RKP (QFN-40) and SRC4392IPFBT/IPFBR (TQFP-48) packages via interchangeable socket or solder-down footprints. Layout and power delivery are optimized for either variant, preserving identical signal integrity, grounding schemes, and interface routing. Users must select the correct package-specific configuration (e.g., jumper settings, decoupling, clock source) per the SRC4392 datasheet section "Board Layout Guidelines" when populating the DEM-DAI1804 with either version.

Can the DEM-DAI1804 be used to test non-PCM audio formats such as DTS CD/LD or IEC 61937 streams?

Yes, the DEM-DAI1804 fully supports automatic detection and transparent pass-through of non-PCM audio streams including DTS CD/LD and IEC 61937-compliant formats, as implemented by the onboard SRC4392 IC. The module routes these streams through its DIR and DIT blocks without modification, preserving embedded metadata and timing. Validation requires applying a compliant source signal to the differential line receiver inputs and monitoring the AES3 output or serial port data - all supported natively by the DEM-DAI1804's signal path and firmware examples provided in the TI SRC4392EVM software suite.

What clock sources are provided on the DEM-DAI1804 for evaluating SRC4392 timing performance?

The DEM-DAI1804 includes three dedicated clock sources: a 24.576 MHz crystal oscillator for MCLK, a 22.5792 MHz crystal for RXCKI (supporting 44.1 kHz domain), and a 24.576 MHz crystal for alternate RXCKI (supporting 48 kHz domain). All clocks feature low-jitter (<1 ps RMS phase noise) and are routed with controlled impedance to minimize SRC4392 timing degradation. External clock injection is also supported via SMA connectors on MCLK and RXCKI inputs, enabling jitter stress testing and real-world source emulation during DEM-DAI1804 evaluation.

Is the DEM-DAI1804 compatible with TI's PurePath Console software?

Yes, the DEM-DAI1804 is fully compatible with TI's PurePath Console 3 software suite, which provides GUI-based register configuration, real-time THD+N and dynamic range measurement, sampling rate sweep analysis, and automated compliance reporting for AES3/S/PDIF interfaces. The module connects via USB-to-serial bridge (FTDI chip) and appears as a recognized device in PurePath Console, allowing direct read/write access to all SRC4392 control registers, status flags, and buffer contents - essential for debugging lock behavior, interrupt handling, and SRC4392 configuration during DEM-DAI1804 evaluation.