Kenwood TK-80, Service Manual

Page: 26 / 125

TK-80
25
Balanced Modulation: NJM2594V (TX-RX unit IC4)
8 bit
R-2R segment
D-A converter
8 bit
R-2R segment
D-A converter
8 bit
Latch
8 bit
Latch
8 bit
R-2R segment
D-A converter
8 bit
R-2R segment
D-A converter
8 bit
R-2R segment
D-A converter
24
V
IN
8
1
V
IN
1
2
V
OUT
1
3
V
OUT
2
4
V
IN
2
6
LD
7
CLK
8
DI
9
V
IN
3
10
V
OUT
3
11
V
OUT
4
12
V
IN
4
5
V
DD
23
V
OUT
8
22
V
OUT
7
21
V
IN
7
20
GND
19
RESET
18
V
DA
ref
17
D
O
16
V
IN
6
15
V
OUT
6
14
V
OUT
5
13
V
IN
5
8 bit
Latch
8 bit
Latch
8 bit
Latch
8 bit
Latch
8 bit
Latch
8 bit
Latch
8 bit
R-2R segment
D-A converter
8 bit
R-2R segment
D-A converter
8 bit
R-2R segment
D-A converter
12 bit shift register
Adress
decoder
D0 ~ D7 D8~D11
8
8
8
1 2 3 4
7 6 5
NC Bypass
Carrier
input
Signal
input
V+ Output
1
Output
2
GND
D/A Converter: M62363FP (TX-RX unit IC13)
Pin No. Pin Name Port Name Description
1,2 NC VI1,VO1 Not used
3 POC VO2 Power control
4 (5V) VI2 Created from 14V at zener and resistive division
9 RAF VI3 AF reference voltage
10 AFC VO3 AF voltage (VCA control voltage)
11 MICOUT VO4 Microphone output (audio), microphone gain
12 MICIN VI4 Microphone input (audio)
13 (5V) VI5 Vdd common
14 CAR VO5 CAR level
15 TGC VO6 TX gain control
16 (5V) VI6 Vdd common
21 (5V) VI7 Vdd common
SEMICONDUCTOR DATA
■
M62363FP Block diagram