Texas Instruments DEM-DAI1801

Overview

DEM-DAI1801 from Burr-Brown Corporation is an evaluation kit comprising the DEM-PCM1801 fixture and the DEM-DAI mother board, designed for prototyping and functional validation of the PCM1801 16-bit stereo audio A/D converter. It supports I²S and left-justified digital audio formats, operates with a single +5V supply, and enables S/PDIF output via coaxial or optical link.

For engineers reviewing the DEM-DAI1801 datasheet, DEM-DAI1801 pinout, DEM-DAI1801 application, or DEM-DAI1801 equivalent, this kit provides full-system clock derivation, configurable high-pass filtering, AC-coupled analog inputs (1 Vrms full-scale), and seamless integration with external audio sources for rapid A/D converter evaluation.

Technical Context

The DEM-DAI1801 integrates two hardware modules: the DEM-PCM1801 daughter card hosting the PCM1801 A/D converter with on-board DIP-switch configuration (FMT/BYPASS), and the DEM-DAI mother board supplying system clocks (SCLK, LRCK, BCK) via crystal oscillator/divider circuitry. It implements slave-mode serial audio interface operation only.

All digital I/O signals-including DOUT, LRCK, BCK, and SCLK-are routed between boards via dedicated connectors; analog inputs (VINL/VINR) are AC-coupled with 1 µF electrolytic capacitors, and power delivery uses CN4 with JP1 jumper configuration when mated to the mother board.

Key Specifications

Availability

DEM-DAI1801 is available at Aetrix Electronics and suitable for audio codec evaluation, stereo A/D converter validation, and S/PDIF interface development requiring stable component supply and documented reference hardware.

Supply support for DEM-DAI1801 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

Burr-Brown Corporation was a U.S.-based analog and mixed-signal semiconductor company acquired by Texas Instruments in 2000, known for precision data converters and audio ICs.

The DEM-DAI1801 belongs to Burr-Brown's audio evaluation platform product line, engineered to accelerate design-in of the PCM1801 A/D converter through complete clocking, signal conditioning, and digital interface reference implementation.

FAQ

What is the DEM-DAI1801 used for?

The DEM-DAI1801 is an evaluation kit combining the DEM-PCM1801 fixture and DEM-DAI mother board to validate the PCM1801 16-bit stereo audio A/D converter. It enables functional testing of analog input performance, digital audio format configuration (I²S/left-justified), high-pass filter bypass, and S/PDIF output generation-without requiring custom clock generation circuitry. The DEM-DAI1801 serves as a turnkey reference for audio system architects evaluating ADC integration paths.

Does the DEM-DAI1801 require external power supplies beyond +5V?

No. The DEM-DAI1801 operates exclusively from a single +5V supply. When used with the DEM-DAI mother board, power is delivered via connector CN4 on the DEM-PCM1801, and JP1 jumpers must be installed to enable proper power routing. No additional voltage rails (e.g., ±15V, +3.3V) are needed-the DEM-DAI1801 integrates all necessary decoupling and filtering components per the PCM1801's requirements.

Can the DEM-DAI1801 operate without the DEM-DAI mother board?

No. The DEM-DAI1801 is defined as the combined set of DEM-PCM1801 and DEM-DAI. While the DEM-PCM1801 alone can function as a basic fixture with external clock sources, the DEM-DAI1801 specifically denotes the integrated platform where the DEM-DAI provides essential clock generation (SCLK, LRCK, BCK), S/PDIF transmit capability, and system-level synchronization. Without the DEM-DAI, the DEM-DAI1801 does not exist as a functional unit.

How is audio data format selected on the DEM-DAI1801?

Audio data format selection is performed using DIP switch SW1 on the DEM-PCM1801 board within the DEM-DAI1801 kit. Position FMT = Low configures 16-bit left-justified mode; FMT = High selects I²S mode. Both modes use MSB-first binary two's complement format. This setting directly controls the PCM1801's serial port timing and frame alignment-no firmware or software configuration is involved.

Is the DEM-DAI1801 still supported or available for new designs?

The DEM-DAI1801 was released in November 1999 and discontinued following TI's acquisition of Burr-Brown. It remains available through authorized legacy distributors and Aetrix Electronics' long-life inventory program for repair, reverse-engineering, and legacy system maintenance. No updated documentation, drivers, or compatibility guarantees are provided-but full original schematics, layout plots, and configuration details are preserved in the public datasheet archive.