Table of Contents
Advertisement
IC BLOCK DIAGRAM & DESCRIPTION
IC231 LA1844ML (Electronic Tuning-supported Home Audio Tuner IC)
24
23
ALC
AM
OSC
BUFF
LEVEL
DET
S-CURVE
FM
FM
IF
DET
1
2
IC241 LC72121M-D (PLL Synthesizer)
Vssx
2
XIN
1
XOUT
24
FMIN
17
AMIN
16
CE
3
DI
4
CL
5
6
DO
V
18
DD
Vssd
15
IC442 TDA7265 (25+25W Stereo Amplifier
with Mute & ST-BY)
MUTE/
5
ST-BY
IN (L)
7
9
GND
IN (R)
11
22
21
20
19
AM
AM
MIX
RF.AMP
AGC
AM
AM
DET
IF
AM/FM
IF
COMP
BUFF
TUNING
DRIVE
REG
GND
3
4
5
REFERENCE
DIVIDER
SWALLOW COUNTER
1/2
1/16, 1/17 4bits
12bits PROGRAMMABLE
DIVIDER
CCB
DATA SHIFT REGISTER LATCH
I / F
POWER
ON
RESET
7
8
9
BO1 BO2 BO3 BO4
+Vs
3
4
OUT (L)
8
IN- (L)
10
IN- (R)
2
OUT (R)
1
6
-Vs
18
17
16
DECODER
ANTI-BIRDIE
P-DET
VCO
304kHz
VCC
6
7
8
9
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
UNIVERSAL
COUNTER
10
11
14
IO1 IO2
IC443 BA7755A (Rec/Play Switch)
1
- 11 -
15
14
13
PILOT
CANCEL
STEREO
SW
FF
FF
FF
PILOT
38k
19k
19k
DET
2
10
11
12
19
PD
20
AIN
21
AOUT
22
Vssa
13
IFIN
2
3
4
5
Hide quick links:
Advertisement
Table of Contents
