CS8416-CS datasheet(12/48 Pages) CIRRUS

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CS8416

DS578PP2

3 GENERAL DESCRIPTION

The CS8416 is a monolithic CMOS device which

receives and decodes audio data according to the

AES3, IEC60958, S/PDIF, and EIAJ CP1201 inter-

face standards.

The CS8416 utilizes an 8:2 multiplexer to select

between eight inputs for decoding and to allow an

input signal to be routed to an output of the

CS8416. Input data is either differential or single-

ended. A low jitter clock is recovered from the in-

coming data using a PLL. The decoded audio data

is output through a configurable, 3-wire output

port. The channel status and Q-channel subcode

portion of the user data are assembled in registers

and may be accessed through an SPI or I2C port.

Three General Purpose Output (GPO) pins are pro-

vided to allow a variety of signals to be accessed

under software control. In hardware mode, dedicat-

ed pins are used to select audio stream inputs for

decoding and transmission to a dedicated TX pin.

Hardware mode also allows direct access to chan-

nel status and user data output pins.

Figure 5 and Figure 6 show the power supply and

external connections to the CS8416 when config-

ured for software and hardware modes. Please note

that all I/O pins, including RXN and RXP[7:0], op-

erate at the VL+ voltage.

3.1

AES3 and S/PDIF Standards

Documents

This document assumes that the user is familiar

with the AES3 and S/PDIF data formats. It is advis-

able to have current copies of the AES3, IEC60958,

and IEC61937 specifications on hand for easy ref-

erence.

The latest AES3 standard is available from the Au-

dio Engineering Society or ANSI at www.aes.org

or at www.ansi.org. Obtain a copy of the latest

IEC60958/61937 standard from ANSI or from the

International

Electrotechnical

Commission

www.iec.ch. The latest EIAJ CP-1201 standard is

available from the Japanese Electronics Bureau.

Application Note 22: Overview of Digital Audio In-

terface 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 System 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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