PCM4201 datasheet(18/28 Pages) TI2

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PCM4201

SBAS342B − DECEMBER 2004 − REVISED APRIL 2006

www.ti.com

INTERFACING TO THE DIT4096 DIGITAL AUDIO

TRANSMITTER

The Texas Instruments DIT4096 digital audio transmitter

encodes linear PCM audio data into AES3 standard

formatted data, which is compatible with a number of

professional and consumer audio specifications and

interfaces. This encoding provides a convenient, standard

transmission format over which the audio data from the

PCM4201 may be carried. The physical interface may be

twisted pair or coaxial cable, or all-plastic optical fiber. The

combination of the PCM4201, the DIT4096, and the

appropriate microphone element and preamplifier circuit

may be used to create a cost-effective, digital-interface

microphone solution.

The PCM4201 output data format is equivalent to the

Left-Justified data format supported by the DIT4096

transmitter. Although this format supports two channels for

stereo operation, the PCM4201 provides only one

channel, which corresponds to the left data channel of the

DIT4096 Left-Justified data format, and channel A of the

AES3 frame format. Figure 14 shows the physical

interface between the PCM4201 and the DIT4096

transmitter. The digital supply for the PCM4201 (VDD) and

the digital I/O supply for the DIT4096 (VIO) must be set to

the same voltage in order to ensure logic level

compatibility.

PCM4201

Microphone

Capsule

Master

Clock

Balanced or Unbalanced

Line Interface or

Optical Transmitter

Preamplifier/Buffer

DIT4096

SCLK

SYNC

SDIN

SCKI

M/S

DATA

FSYNC

BCK

MCLK

S/M

TX+

−

IN+

IN−

The PCM4201 is in Master mode, while the DIT4096 is in Slave mode.

Both operate from the same Master clock source.

The data format for the DIT4096 is configured for Left−Justified mode.

NOTES:

Figure 14. Digital Interface Microphone Example

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