Kenwood TH-K20A Service Manual page 8

TH-K20A/K20E
PLL IC: MB15E03SL-E1 (TX-RX unit IC1)
Pin No. Port Name
1 OSCIN
2 OSCOUT
3 VP
4 VCC
5 DO
6 GND
7 XFIN
8 FIN
9 ClOCK
10 DATA
11 LE
12 PS
13 ZC
14 LD/FOUT
P
15
R
16
FM IC: TA31136FNG (TX-RX unit IC200)
Pin No. Port Name
1 OSCIN
2 OSCOUT
3 MIXOUT
4 VCC
5 IFIN
6 DEC
7 FILOUT
8 FILIN
9 AFOUT
10 QUAD
11 IFOUT
12 RSSI
13 NOISEDET
14 NOISEREC
15 GND
16 MIXIN
8
SEMICONDUCTOR DATA
I/O Function
Programmable reference divider
I
input
O Oscillator output
Power supply voltage input for the
-
charge pump
- Power supply voltage (3.0V)
O Charge pump output
- Ground
Prescaler complementary input
I which should be grounded via a
capacitor
I Prescaler input
Clock input for the 19-bit shift reg-
I
ister
Serial data input using binary
I
code
I Load enable signal input
Power saving mode control
I This pin must be set at "L" at
Power-ON.
Forced high-impedance control
I
for the charge pump
O Lock detect signal output
Phase comparator N-channel
O open drain output for an external
charge pump (Not use)
Phase comparator CMOS output
O for an external charge pump (Not
use)
I/O Function
I 2nd Local oscillator input
O 2nd Local oscillator output
O MIX output
- Power supply (5.0V)
I 2nd IF input and decoupling
- 2nd IF input and decoupling
O INVERTER AMP output
I INVERTER AMP input
O Demodulate signal output
Phase shift signal input of FM
I
demodulator
O Output terminal of IF AMP
O This terminal outputs DC
- level according to input (Not use)
- signal level to IF AMP
- Ground
I 1st IF signal input
D/A Converter IC: R2A20178NP
(TX-RX unit IC300)
Pin No. Port Name I/O
1 Vin2 I
2 VDD -
3 LD I
4 CLK I
5 DI I
6 Vin3 I
7 Vout3 O
8 Vout4 O
9 Vin4 I
10 Vin5 I
11 Vout5 O
12 Vout6 O
13 Vin6 I
14 VDAREF1 -
15 VDAREF2 -
16 /RESET I
17 GND -
18 Vin7 I
19 Vout7 O
20 Vout8 O
21 Vin8 I
22 Vin1 I
23 Vout1 O
24 Vout2 O
Function
FROM AF fi lter signal input
Power supply voltage (5.0V)
Load enable signal input
Control data input
Control clock input
From MIC AMP and limiter signal
input
Load enable signal input
Tone deviation adjust
Tone signal input
Connect to ground
VCO assist voltage adjust
TCXO frequency adjust
Connect to ground
Reference voltage 1 for DAC
(1.8V)
Reference voltage 1 for DAC
(5.0V)
Reset
Ground
Connect to ground
RX BPF tuning adjust
TX power adjust
Connect to ground
From MIC output
MIC level contorol and mute
RX AF mute control