CS8420 datasheet(11/80 Pages) CIRRUS

11 / 80 page

CS8420

DS245PP2

GENERAL DESCRIPTION

The CS8420 is a fully asynchronous sample rate

converter plus AES3 transceiver intended to be

used in digital audio systems. Such systems include

digital mixing consoles, effects processors, tape re-

corders and computer multimedia systems. The

CS8420 is intended for 16, 20, and 24-bit applica-

tions where the input sample rate is unknown, or is

known to be asynchronous to the system sample

rate.

On the input side of the CS8420, AES3 or a 3-wire

serial format can be chosen. The output side pro-

duces both AES3 and a 3-wire serial format. An

I2C/SPI compatible microcontroller interface al-

lows full block processing of channel status and

user data via block reads from the incoming AES3

data stream and block writes to the outgoing AES3

data stream. The user can also access information

decoded from the input AES3 data stream, such as

the presence of non-audio data and pre-emphasis,

as well as control the various modes of the device.

For users who prefer not to use a micro-controller,

six hardware modes have been provided, docu-

mented towards the end of this data sheet. In these

modes, flexibility is limited, with pins providing

some programmability.

When used for AES3 in, AES3 out applications, the

CS8420 can automatically transceive user data that

conforms to the IEC60958 recommended format.

The CS8420 also allows access to the relevant bits

in the AES3 data stream to comply with the serial

copy management system (SCMS).

The diagram on the cover of this data sheet shows

the main functional blocks of the CS8420. Figure 5

shows the supply and external connections to the

device.

Familiarity with the AES3 and IEC60958 specifi-

cations are assumed throughout this document. The

Application Note: “Overview of Digital Audio In-

terface Data Structures”, contains a tutorial on dig-

ital

audio

specifications.

The

paper

“An

Understanding and Implementation of the SCMS

Serial Copy Management System for Digital Audio

Transmission”, by Clif Sanchez, is an excellent tu-

torial on SCMS. It may be obtained from Crystal

Semiconductor, or from the AES.

To guarantee system compliance, the proper stan-

dards documents should be obtained. The latest

AES3 standard should be obtained from the Audio

Engineering Society or ANSI, the latest IEC60958

standard from the International Electrotechnical

Commission and the latest EIAJ CP-1201 standard

from the Japanese Electronics Bureau.

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