saa7825 NXP Semiconductors, saa7825 Datasheet - Page 19

• Manufacturer Part Number: saa7825
• Description: Cd Audio Decoder, Digital Servo And Filterless Dac With Integrated Pre-amp And Laser Control
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.10
7.10.1
The onboard audio DEM DAC operates at an oversampling rate of 96f
at 1f
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 SAA7825 can be routed as described in Sections 7.10.1.1 and 7.10.1.2.
Table 6 Shadow register
7.10.1.1
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 1f
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 Aug 13
01
(bank 1)
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SHADEN
s
. The DAC is equipped with two pairs of stereo outputs for driving medium impedance line outputs and for directly
BITS
Audio DAC interface
I
NTERNAL DYNAMIC ELEMENT MATCHING DIGITAL
Use of internal DAC
7
control of
onboard DAC
REGISTER
SHADOW
OK
Interpolation
ADDRESS
Error
0111
Fig.12 Concealment mechanism.
OK
Error
DATA
-
0000
0010
TO
-
Hold
ANALOG CONVERTER
19
Error
use external DAC or route audio data
back into onboard DAC (loopback
mode)
route audio data directly into onboard
DAC (non-loopback mode)
s
Error
Interpolation
and is designed for operation with an audio input
s
mode, either I
FUNCTION
OK
2
OK
S-bus or EIAJ format. CD-ROM
MGA372
Objective specification
SAA7825
RESET
reset