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Time Division Multiplexed Audio Interface:

A Tutorial

INTRODUCTION

Transferring multiple channels of digital audio data within an audio product can be a challenge. The complexities

involving signal routing and providing a sufficient number of input/output ports on digital-signal-processors and con-

verters can be a daunting task. As a result, the industry has adopted a Time Division Multiplexed (TDM) interface

that allows multiple channels of data to be transmitted on a single data line. The TDM interface is by far the most

common mechanism used to transfer multiple channels of audio data between devices within a system as shown in

Figure 1. The TDM interface has not been standardized and there can be variants between the TDM formats. For-

tunately the TDM ports in DSP devices are programmable and will support the multitude of options.

It is advantageous to limit the degrees of flexibility in a TDM interface for analog-to-digital converters, digital-to-an-

alog converters, multiple function audio CODECs and other high-performance mixed-signal products to avoid po-

tential performance degradation due to clock interference. As a result, Cirrus Logic has chosen to standardize on a

TDM format for audio converter products and support a subset of the options that are available with DSP devices,

including the DSP products from Cirrus Logic. The goal of this document is to present an overview of the TDM in-

terface and a discussion of the TDM format that is supported in Cirrus Logic audio converter products.

Figure 1. TDM System Block Diagram

Multi-Channel

Analog-to-Digital Converter

Multi-Channel

Digital-to-Analog Converter

DSP

Frame Sync

Serial Clock

Serial DataSerial Data

SEPTEMBER '06

AN301REV1

AN301

1 2 3 4

Sommario

Pagina 1 - A Tutorial

Pagina 2 - 1. TDM OVERVIEW

2 AN301REV1AN3011. TDM OVERVIEWThe TDM interface is similar to the 2-Channel Serial Audio Interface, discussed in Cirrus Applications Note AN282,with

Pagina 3 - 2.2 Exceptions to the Rule

AN301AN301REV1 32. CIRRUS LOGIC AUDIO CONVERTER TDM INTERFACEAll Cirrus Logic converter products are capable as operating as a slave to a systems cloc

Pagina 4 - 3. REVISION HISTORY

4 AN301REV1AN3013. REVISION HISTORYRelease ChangesRevision 1 Initial ReleaseContacting Cirrus Logic SupportFor all product questions and inquiries, co

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