PCM4108CPAPT datasheet(14/39 Pages) TI

14 / 39 page

PCM4108

SBAS354 − JUNE 2005

www.ti.com

PRODUCT OVERVIEW

The PCM4108 is a high-performance, eight-channel D/A

converter designed for professional audio systems. The

PCM4108 supports 16- to 24-bit linear PCM input data and

sampling frequencies up to 216kHz. The PCM4108

utilizes an 8x oversampling digital interpolation filter,

followed by a multi-level delta-sigma modulator with a

single

pole

switched

capacitor

output

filter.

This

architecture provides excellent dynamic and sonic

performance, as well as high tolerance to clock phase

jitter. Functional block diagrams in Figure 1 and Figure 2

illustrate Standalone and Software modes, respectively.

The PCM4108 incorporates a flexible audio serial port,

which accepts 16- to 24-bit PCM audio data in both

standard audio formats (Left-Justified, Right-Justified, and

Philips I2S) and TDM data formats. The TDM formats are

especially useful for interfacing to the synchronous serial

ports of digital signal processors.

The PCM4108 offers two modes for configuration control:

Software and Standalone. Software mode makes use of a

five-wire SPI port to access internal control registers,

allowing configuration of the full PCM4108 feature set.

Standalone mode offers a more limited subset of the

functions available in Software mode, while allowing for a

simplified pin-programmed configuration mode.

Digital

Filtering

and

Functions

Audio

Serial

Port

Control

OUT1+

OUT1−

OUT2+

OUT2−

OUT3+

OUT3−

OUT4+

OUT4−

Digital

Power

Analog

Power

System Clock

and

Timing

CC1

AGND1

CC21

AGND2

DGND

References

REF1+

REF1−

REF2+

REF2−

COM1

REF3+

REF3−

REF4+

REF4−

COM2

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

OUT5+

OUT5−

OUT6+

OUT6−

OUT7+

OUT7−

OUT8+

OUT8−

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

LRCK

BCK

DATA0

DATA1

DATA2

DATA3

SCKI

RST

MUTE

DEM0

DEM1

SUBA

SUBB

FMT0

FMT1

FMT2

FS0

FS1

MODE

Figure 1. Functional Block Diagram for Standalone Mode

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