Fisher PH-DTA300M Service Manual page 9

IC BLOCK DIAGRAM & DESCRIPTION
IC101 TA2104B (Tuner)
FM RF AM FM AM OSC
RF OUT Vcc RF IN OSC OSC OUT
24 23 22 21 20 19
AM
OSC
FM
OSC
BUFF
LEVEL
BUFF
AM
MIX
FM
FMRF
AMIF
MIX
1 2 3 4 5
RF FM AM MIX Vcc AM
GND RF IN LOW OUT IF IN
CUT
IC151 TC9257F (Tuner PLL)
PERIOD
CLOCK
FM
L
AMP
FM 1/ 2
IN
FM
H
AM
IN
XT
OSC
CIRCUIT
XT
DATA
CLOCK
PERIOD
(Note) Mark terminals are not existence in TC9256P, TC9256F.
Terminal name of TC9256P, TC9256F is shown in parentheses.
Others are common terminals.
ST IF DEV
LED REQ OUT AF IN LPF1
18 17 16 15 14
IF AF
REQ
SW
ST
AF
BUFF
VCO
DECODE
DIVIDE
IF
BUFF
1/8
DET
AM FM
ST/MO
DET DET
FM/AM
AGC
FMIF
MJTE
6 7 8 9 10 11
FM GND AGC QUAD R-OUT
IF IN
TC9256P, TC9256F
XT 1 16 DO2/OT-4
XT 2 15 DO1
3 14 I/O-5/IF
IN1
4 13 I/O-6/IF
IN2
DATA 5 12 GND
OT-1 6 11 FM
IN
OT-2 7 10 AM
IN
OT-3 8 9 V
DD
Top View
DIP-16PIN / SOP-16PIN
PSC
2 MODULUS 4bit SWALLOW
PRESCALER COUNTER
HF
12bit PROGRAMMABLE COUNTER
FM MODE LF
4
REFERENCE COUNTER
1ms
OSC
24bit REGISTER
24bit SHIFT REGISTER
8
TEST
ADDRESS
DECODER
24bit REGISTER
4 4
OUTPUT PORT
UNIVERSAL COUNTER CONTROL
OT-4
OT-1 OT-3
OT-2 OT-4
IC501 TA8227P (Power Amp.)
LPF2
13
12
L-OUT
TC9257P, TC9257F
XT 1
XT 2
PERIOD 3
CLOCK 4
DATA 5
OT-1 6
OT-2 7
OT-3 8
OT-4 9
I/O-5/CLK 10
Top View
DIP-20PIN / SOP-20PIN
V
DD
POWER ON
RESET
RESET
12
MAX
15
4
UNLOCK
5
24 22
10
20bit BINARY COUNTER
XT 1ms
- 8 -
20 DO2
19 DO1
18 I/O-7/SC
IN
17 I/O-8/IF
IN1
16 I/O-9/IF
IN2
15 GND
14 FM
IN
13 AM
IN
12 V
DD
11 I/O-6
GND
TRI-STATE
DO1
BUFFER
TRI-STATE
DO2
BUFFER
(DO2 / OT-4)
OT-4
I / O-5 / CLK
5
I / O-6
I / O-9 / IF
(I / O-6 / IF
AMP
I / O-8 / IF
(I / O-5 / IF
AMP
GATE
I / O-7 / SC
IN2
)
IN2
IN1
)
IN1
IN