Kenwood TK-390 Service Manual page 25

TK-390
2. D/A Converter : M62354GP (TX-RX Unit IC3)
2-1. Terminal connection
Do 1
LD 2
CLK 3
DI 4
Ao 5
1
Ao 6
2
NC 7
GND 8
2-2. Block diagram
Ao
V V
CC DD 6
16 15 14
+ –
D-A
Ch6
L
(6)
.......
Address
Decoder
12 bit Shift Register
1 2 3
Do LD CLK
3. RF Power Amplifier : XHW2727-2 (Control Unit IC501)
3-1. Block diagram
1 2 3
24
SEMICONDUCTOR DATA
16 V
CC
15 V
DD
14 Ao
6
13 Ao
5
12 Ao
4
11 Ao
3
10 NC
9 A
SS
Ao Ao Ao
5 4 3
13 12 11
+ – + – + –
8 bit
D-A D-A R-2R+Segment
D-A converter
Ch5 Ch4 Ch3
8 bit
L L
Latch
(6)
.....
8 bit
L
Latch
Ch2
Ch1
8 bit
D-A R-2R+Segment
D-A Converter
+ – + –
Buffer
OP amp
4 5 6
DI Ao Ao
1 2
4 5
2-3. Terminal function
Pin No. Symbol
1 Do
2 LD
3 CLK
4 DI
5,6 AO1, AO2
7 NC
V
SS
9
8 GND
9 Vss
10 NC
11~14 AO3~AO6
15 VDD
16 Vcc
8
GND
3-2. Maximum ratings (Flange temperature = 25°C)
Rating
DC supply voltage (Pins 3,4)
DC control voltage (Pin 2)
RF input power
RF output power (V
DD1,2
Operating case temperature range
Storage temperature range
I/O Function
O 12-bit shift register MSB bit data is
output.
I When the LD is at the high level,
the 12-bit shift register value is
loaded to the D/A output register.
I Shift clock input. With the rise of
the shift clock, the input signal from
the DI is input to the 12-bit shift
register.
I Serial data input. Input serial data
12 bits long.
O 8-bit resolution D/A.
– Not connected.
– GND.
– Terminal for determining the D/A
conversion reference low side point
level.
– Not connected.
O 8-bit resolution D/A.
– Terminal for determining the D/A
conversion reference up side point
level.
– Power supply.
Symbol Value
V 10
DD1,2
Vcont 10
Pin 40
=9V) Pout 9
Tc –30 to +100
Tstg –30 to +100
Unit
Vdc
Vdc
dBm
W
°C
°C