PCM4204PAPR datasheet(14/38 Pages) TI1

14 / 38 page

PCM4204

SBAS327A − JUNE 2004 − REVISED SEPTEMBER 2004

www.ti.com

PRODUCT OVERVIEW

The PCM4204 is a high-performance, four-channel audio

analog-to-digital (A/D) converter designed for use in

professional and broadcast audio applications. The

PCM4204 features 24-bit linear PCM data outputs, as well

as 1-bit Direct Stream Digital (DSD) data output and input

capability for all four channels. Sampling rates up to

216kHz are supported for PCM output formats, while 64x

or 128x oversampled 1-bit data is supported for DSD

modes. Native support for both PCM and DSD data

formats makes the PCM4204 ideal for use in a wide variety

of audio recording and processing applications.

The PCM4204 features 1-bit delta sigma modulators

employing density modulated dither for improved dynamic

performance. Differential voltage inputs are utilized for the

modulators, providing excellent common-mode rejection.

On-chip

voltage

references

are

provided

for

the

modulators, in addition to generating DC common-mode

bias voltage outputs for use with external input circuitry.

Linear phase digital decimation filtering is provided for the

24-bit PCM output, with a minimum stop band attenuation

of −100dB for all sampling modes.

The PCM output mode features clipping flag outputs for

each of the four channels, as well as a digital high-pass

filter for DC removal. The PCM4204 may be configured

using dedicated input pins for sampling mode and audio

data format selection, high-pass filter enable/disable, and

reset/power-down operation.

A +5V power supply is required for the analog section of

the device, while a +3.3V power supply is required for the

digital circuitry. Figure 1 shows the functional block

diagram for the PCM4204.

Audio

Serial

Port

Control

and

Status

IN1+

IN1−

REF12+

AGND4

IN2+

IN2−

REF12−

Power and Ground

System Clock

and

Timing

COM12

Delta−Sigma

Modulator

Delta−Sigma

Modulator

Reference

LRCK

BCK

SDOUT1

SDOUT2

DSD

Data

Port

DSD1

DSD2

DSD3

DSD4

DSDCLK

Digital

Decimation andHighPass

Filters

To Other

Blocks

To /From

Other Blocks

FS0

FS1

FS2

S/M

FMT0

FMT1

FMT2

HPFD

SUB

RST

CLIP1

CLIP2

CLIP3

CLIP4

SCKI

IN3+

IN3−

REF34+

AGND3

IN4+

IN4−

REF34−

COM34

Delta−Sigma

Modulator

Delta−Sigma

Modulator

Reference

Figure 1. PCM4204 Functional Block Diagram

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