Denon S-81 - Functional Block Diagram

46
S-81/S-81DAB
PCM1754 (IC103 : 1U-3790)
SCK
FMT
MUTE
DEMP
TEST
ZEROA
V
COM
AGND
16
15
14
13
12
11
10
9
BCK
DATA
LRCK
DGND
NC
V
CC
V
OUT
L
V
OUT
R
(TOP VIEW)
1
2
3
4
5
6
7
8
FUNCTIONAL BLOCK DIAGRAM
Power Supply
DGND
Enhanced
Multilevel
Delta-Sigma
Modulator
V
OUT
L
4x/8x
Oversampling
Digital
Filter
and
Function
Control
Audio
Serial
Port
BCK
LRCK
DATA
Serial
Control
Port
Zero Detect
TEST
SCK
System
Clock
Manager
MUTE
FMT
Output Amp
and
Low-Pass Filter
DEMP
DAC
V
COM
System Clock
AGND
V
CC
ZEROA
Output Amp
and
Low-Pass Filter
DAC
V
OUT
R
Terminal Functions
TERMINAL
NAME NO.
I/O
DESCRIPTION
AGND 9–Analog ground
BCK 1 I Audio-data bit-clock input
DATA 2 I Audio-data digital input
DEMP 13 I De-emphasis control
(1)
DGND 4 – Digital ground
FMT 15 I Data format select
(1)
LRCK 3 I L-channel and R-channel audio data latch enable input
MUTE 14 I Analog mixing control
(1)
NC 5 –
SCK 16 I System clock input
TEST 12 I Test pin. Ground or open
(1)
V
CC
6 – Analog power supply, 5 V
V
COM
10 – Common voltage decoupling
V
OUT
L 7 O Analog output for L-channel
V
OUT
R 8 O Analog output for R-channel
ZEROA 11 O Zero flag output for L/R channels
(1)
Schmitt-trigger input with internal pulldown.