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Philips SACD 1000/001 Service Manual Page 103

Dvd-video player.
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IC-Pin_no
Name
171
GND_CORE
172
PCM_dclk_Out
173
Tst(1)
174
Tst(0)
175
TDI
176
TMS
177
TCK
178
TDO
179
TRST
180
GND_IO
181
H_IRQn
182
H_A22
183
H_A[21]
184
H_A[20]
185
H_A[19]
186
H_A[18]
187
H_A[17]
188
H_A[16]
189
H_A[15]
190
H_A[14]
191
H_A[13]
192
H_A[12]
193
H_A[11]
194
H_A[10]
195
VCC_CORE
196
GND_CORE
197
H_A[9]
198
H_A[8]
199
H_A[7]
200
H_A[6]
201
H_A[5]
202
H_A[4]
203
H_A[3]
204
H_A[2]
205
H_A[1]
206
VCC_IO
207
H_DQ[15]
208
H_DQ[14]
9.25 Circuit description of DAC board
9.25.1 Description
The DAC board has 6 high performance audio outputs. It
consists of 3 D/A converters and their appropriate filters, the
clock generator part, the filter-control part and the muting-
control part (See block diagram).
Key components are D/A converter CS4397 and I2C
controller PCF8574.
The DAC board supports DSD and PCM. The digital data are
sent from the MONO board to the DAC's QD41,QD51 and
QD61 via a flex and connector JD01. The audio signals are
sent to the cinches via a 2 or 1 filter stage. In these filter
stages discrete opamp's are used.
The DAC board is I2C controlled via the I2C bus from the
mono board to the DAC's and I2C controller QD21.
The differences between DSD mode and PCM mode are
shown in the table below:
Digital audio data
Circuit-, IC descriptions and list of abbreviations
Type
Function
IN
Ground(core)
O5
PCM data clock
IN
internal pull up for both test pins
IN
IC testpins tst(1:0)
11 : Functional behaviour
10 : RAM test
01 : scan shift
00 : scan normal
IN
Boundary scan Data Input.
IN
Boundary scan Mode select
IN
Boundary scan Clock
O10
O10put
IN
Boundary scan Reset.
IN
Ground
O5
Interrupt Request, active low
IN
Data Strobe, active low
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
3.3V power supply Core
IN
Ground(core)
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
Address bus
IN
3.3V power supply IO
I/O5
Data bus
I/O5
Data bus
SACD 1000
Pin number
PCM mode
11
BCK
12
LRCK
13
SDT
14
SEL_PCM
MCLK
AUDIO SIGNAL
DSD(SACD)
PCM audio (Fs = 44.1 kHz) (CD) 384Fs(16.9344 MHz)
PCM audio (Fs = 32,4896 kHz) 256Fs
9.25.2 Filter setting
The user can select 3 filter settings using switch SD71 at the
rear of the set. This is only effective during the playback of
SACD discs. See the table below.
9.
GB 147
DSD mode
BCK
SEL_DSD
DSD_L
DSD_R
MCLK
192Fs(8.4672 MHz)

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