CS8406 datasheet(13/43 Pages) CIRRUS

13 / 43 page

CS8406

DS580F1

3. GENERAL DESCRIPTION

The CS8406 is a monolithic CMOS device which encodes and transmits audio data according to

the AES3, IEC60958, S/PDIF, and EIAJ CP1201 interface standards. The CS8406 accepts au-

dio, channel status and user data, which is then multiplexed, encoded, and driven onto a cable.

The audio data is input through a configurable, 3-wire input port. The channel status bits and user

bit data are input through an SPI or I²C Mode microcontroller port and may be assembled in sep-

arate block sized buffers.

For systems with no microcontroller, a stand alone mode allows direct access to channel status

and user data input pins.

Target applications include CD-R, DAT, DVD, MD and VTR equipment, mixing consoles, digital

audio transmission equipment, high quality A/D converters, effects processors, set-top TV box-

es, and computer audio systems.

Figure 5 shows the supply and external connections to the CS8406 when configured for opera-

tion with a microcontroller. Figure 6 shows the supply and external connections to the CS8406

when configured for operation without a microcontroller.

3.1

AES3 and S/PDIF Standards Documents

This data sheet assumes that the user is familiar with the AES3 and S/PDIF data formats. It is

advisable to have current copies of the AES3 and IEC60958 specifications on hand for easy ref-

erence.

The latest AES3 standard is available from the Audio Engineering Society or ANSI at

www.aes.org or www.ansi.org. Obtain the latest IEC60958 standard from ANSI or from the Inter-

national Electrotechnical Commission at www.iec.ch. The latest EIAJ CP-1201 standard is avail-

able from the Japanese Electronics Bureau.

Application Note 22:

Overview of Digital Audio Interface Data Structures contains a useful tutorial

on digital audio specifications, but it should not be considered a substitute for the standards.

The paper

An Understanding and Implementation of the SCMS Serial Copy Management Sys-

tem for Digital Audio Transmission, by Clifton Sanchez, is an excellent tutorial on SCMS. It is

available from the AES as reprint 3518.

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