Aiwa XD-DV170 Service Manual page 32

IC BLOCK DIAGRAM - 4/4
IC, PCM1723
Data ROM
OSC
24 1
XTI
XTO
IC, S-8520B28MC
IC, SN74LV245APW
Internal System Clock
Counter N
Counter M
5
MCKO
27 MHz
5
VIN
4
EXT
1
ON/OFF
Phase Detector
&
Loop Filter
REFERENCE
OSC
POWER SUPPLY
PWM
CONTROL
CIRCUIT
ON/OFF
IC, YSS915C-PK28MP-1
DI 1
BCI 2
SDSY 28
DO 3
L/R 4
BCO 6
ZERO
MICIN
14
AOL 15
AOR
16
VREF 13
-32-
VCO
3 VOUT
2 VSS
20 24 25 26 27 23
CPU
INTERFACE
DIGITAL I/O
INTERFACE
DSP
PROGRAM
ANALOG
BLOCK
11 12
2
SCKO
256 fs / 384 fs
DISPLAY
RAM
ROM
18
RST
CLOCK
OSC
22
CRE
17 9