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INTERFACING TO DIGITAL AUDIO TRANSMITTERS (AES3, IEC60958-3, and S/PDIF)

PCM4220

Dividedby2

FS1

LO

LO

HI

HI

FS0

LO

HI

LO

HI

Mode

Normal

DoubleSpeed

QuadSpeed

Reserved

MCKI

BCK

LRCK

FS1

FS0

MCLK

CLK0

CLK1

512f (Normal)

S

256f (DoubleSpeed)

S

128f (QuadSpeed)

S

DIT4192

Master

Clock

DATA

S/M

SCLK

SYNC

SDATA

M/S

LO= ADCMaster

HI= ADCSlave

CLK1

LO

LO

HI

HI

CLK0

LO

HI

LO

HI

Mode

QuadSpeed

DoubleSpeed

Reserved

Normal

PCM4220

SBAS407A – DECEMBER 2006 – REVISED MAY 2007

The serial output of audio analog-to-digital converters is oftentimes interfaced to transmitter devices that encode

the serial output data to either the AES3 or IEC60958-3 (or S/PDIF) interface formats. Texas Instruments

manufactures several devices that perform this encoding, including the DIT4192, DIX4192, SRC4382, and

SRC4392. This section describes and illustrates the audio serial port interface connections required for

communications between the PCM4220 and these devices. Register programming details for the DIX4192 and

SRC4382/4392 are also provided.

Figure 48 shows the interface between a PCM4220 and a DIT4192 transmitter. This configuration supports

sampling frequencies and encoded frame rates from 8kHz to 216kHz. For this example, the audio data format

VDD supply and DIT4192 VIO supply must be the same voltage, to ensure logic level compatibility.

Figure 49 illustrates the audio serial port interface between the PCM4220 and either a DIX4192 transceiver or

SRC4382/SRC4392

combo

sample

rate

converter/transceiver

device.

Port

A

of

the

DIX4192

or

SRC4382/SRC4392 is utilized for this example. Data acquired by Port A are sent on to the DIT function block

within the interface device for AES3 encoding and transmission.

The DIX4192 and SRC4382/SRC4392 are software-configurable, with control register and data buffer settings

that determine the operation of internal function blocks. Table 8 and Table 9 summarize the control register

settings for the Port A and the DIT function blocks for both A/D Converter Master and Slave modes, respectively.

Input sampling and encoded frame rates from 8kHz to 216kHz are supported with the appropriate register

settings.

Figure 48. Interfacing the PCM4220 to a DIT4192

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