Philips SACD 1000/001 Service Manual page 103

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)