CDB42406 datasheet(4/32 Pages) CIRRUS

4 / 32 page

CDB42406

1. SYSTEM OVERVIEW

The CDB42406 demonstration board is an excellent means for evaluating the CS42406 stereo

CODEC. Analog and digital audio signal interfaces are provided, as well as a DB-25 computer

parallel port interface for use with the supplied Windows configuration software.

The CDB42406 schematic set has been partitioned into 10 pages and is shown in Figures 16

through 25.

1.1

CS42406 Audio CODEC

A complete description of the CS42406 is included in the CS42406 product data sheet.

1.2

CS8406 Digital Audio Transmitter

The operation of the CS8406 transmitter (see Figure 18) and a discussion of the digital audio

interface are included in the CS8406 data sheet.

The CS8406 converts the PCM data generated by the CS42406 to the standard S/PDIF data

stream. The CS8406 operates in slave mode and only accepts a 256Fs master clock on the

OMCK input pin. The serial audio input data for the CS8406 is received from the serial audio

output of the CS42406. Digital Interface format selection of either Left Justified or I2S can be

made via the I2S/LJ position on switch S3 (see Table 2 for switch control options).

1.3

CS8416 Digital Audio Receiver

The operation of the CS8416 receiver (see Figure 17) and a discussion of the digital audio

interface are included in the CS8416 data sheet.

The CS8416 converts the input S/PDIF data stream into PCM data for the CS42406. The

CS8416 operates in master mode only. Digital Interface format selection of either Left Justi-

fied or I2S can be made via the I2S or LJ position on S1(see Table 2 for switch control op-

tions).

The CS8416 contains an internal input multiplexer which must be set to receive the appropri-

ate stream from the Optical or Coaxial input connector. This is done via the Coaxial or

Optical position on switch S1.

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