SAA7824 Datasheet, PDF(20/89 Page) NXP Semiconductors – CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control (PhonIC)

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SAA7824 Datasheet, PDF (20/89 Pages) NXP Semiconductors – CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control (PhonIC)

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Philips Semiconductors

CD audio decoder, digital servo and ï¬lterless

DAC with integrated pre-amp and laser control

Product speciï¬cation

SAA7824

Interpolation

Hold

Interpolation

Error

MGA372

Fig.13 Concealment mechanism.

7.10 Audio DAC interface

7.10.1 INTERNAL DYNAMIC ELEMENT MATCHING DIGITAL-TO-ANALOG CONVERTER

The onboard audio DEM DAC operates at an oversampling rate of 96fs and is designed for operation with an audio input

at 1fs. The DAC is equipped with two pairs of stereo outputs for driving medium impedance line outputs and for directly

driving low impedance headphones. A pair of analog inputs are provided to enable external audio sources to make use

of the headphone output buffers.

Audio data from the decoder part of the SAA7824 can be routed as described in Sections 7.10.1.1 and 7.10.1.2.

Table 6 Shadow register

SHADEN BITS

SHADOW

(bank 1)

control of

onboard DAC

ADDRESS

0111

DATA

0000

0010

FUNCTION

use external DAC or route audio data

back into onboard DAC (loopback

mode)

route audio data directly into onboard

DAC (non-loopback mode)

RESET

reset

7.10.1.1 Use of internal DAC

Setting shadow register 7 to 0010 will route audio data from the decoder into the internal DAC. To enable the on-board

DAC, the DAC interface format (set by register 3) must be set to 16-bit 1fs mode, either I2S-bus or EIAJ format. CD-ROM

mode can also be used if interpolation is not required. The serial data output pins for interfacing with an external DAC

(SCLK, WCLK, DATA and EF) are set to high-impedance.

2003 Oct 01

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