Onkyo DX-C34, Руководство по обслуживанию

Страница: 33 / 66

DX-C34
IC BLOCK DIAGRAM / TERMINAL DESCRIPTION
Q851: MPD4721GS RS-232C LINE DRIVER/ RECEIVER
BLOCK DIAGRAM
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
300 ohm
300 ohm
5.5k ohm
5.5k ohm
V
DD
C
1
+
V
CC
C
1
-
C
5
+
C
5
-
D
IN1
D
IN2
R
OUT1
R
OUT2
C
4+
GND
C
4-
V
SS
STBY
V
CHA
D
OUT1
D
OUT2
R
IN1
R
IN2
+
+
-10V
C
4
C
2
+
+
C
1
C
3
+
C
5
NOTE1
Top View
+10V
+3.3V
or
+5V
STBY
L
H
H
R
IN
x
L
H
Remarks
Standby mode
Mark level input
Space level input
R
OUT
H
H
L
Receiver
STBY
L
H
H
D
IN
x
L
H
Remarks
Standby mode
Space level output
Mark level output
D
OUT
Z
H
L
Driver
3V 5V switching
V
CHA
L
H
Operating mode
5 V mode (double step-up)
3 V mode (3 times step-up)
H : high-level, L : low-level, Z : high-impedance, x : H or L
20 11
1 10
20 Pin Plastic Shrink SOP
Truth table