79
Outputs:
DSP IC501 Output Signals
Name From
IC501 Purpose When present
L/R Clock Pin 10 48kHz or 44.1kHz clk * Power On
Bit Clock Pin 9 2.3MHz or 2.1MHz clk. * Power On
CH78O Pin 11 Data for analog channels Audio PB
CH12O Pin 15 Data for 5.1 front channels Audio PB
CH34O Pin 14 Data for 5.1 rear channels When AC-3
source is input
CH56O Pin 12 Data f or 5.1 center and
woofer channels When AC-3
source is input
DO Pin 16 Di gital Output Power On
* Depending upon the last disc detected. First frequency is for DVD.
D/A Converter Required Signals
Name Location
pin # Signal When
Present
Vcc 8, 9 3.3V (not shown) At power
ON
Audio
Data 2Data
3Vp-p
During PB
L/R Clock 1 44.1kHz = CD detected
48.kHz = DVD detected
3Vp-p
At power
ON
Bit Clock 3 2,116MHz = CD detected
2,304MHz = DVD detected
3Vp-p
At power
ON
Master
Clock
(Xtal)
5 33.868MHz = CD detected
36.864MHz = DVD detected
4Vp-p
At power
ON
Output 13 & 16 2Vp-p (analog audio) During PB
Chip
Select 28 10usec, 3Vp-p, low pulse. At play,
pause, stop.
Communi
cations
Clock
27 4 groups of 8 low going pulses. During PB
Communi
cations
Data
26 20usec positive
g
oin
g
data
pulses. Data is used for reset
,
mute, and gain/balance.
H= pause or stop.
During PB
Audio DSP IC501
Purpose:
·Down-mixing of six channel AC-3 into two (L/R) channels
·Dolby Prologic decoding
·Audio enhancements when there is no AC-3 received (this rear chan-
nel delay circuitry is only found in some models):
qDigital Cinema Soundâ gives you the illusion of various spatial room
environments
qVirtual Enhanced Surround (VES) for 3D sound with two speakers
qEnhanced Surround for a greater sense of presence from the normal
Dolby Prologic sound
·Digital coax and optical output
·Rear channel delay
·Front/rear level balancing
·Test tone generation
D/A Converters IC902, IC905 – IC907
Purpose
Converts the digital input to analog output when received.
Support Signals
All the D/A IC support signals go to the same pins of these ICs because
they are the same number IC (CXD8799).