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LA1823DIP (IC1) : 1chip AM/FM, MPX tuner system
1. Block diagram
24
23
22
GND2
FM
RF
AM
AM
RF
MIX
AM
OSC
REG
1
2
3
2. Pin function
Pin
I/O
No.
Symbol
1
AM_RFIN
I
AMRF signal input
2
REG.
-
3
AM_OSC
-
AM local oscillation circuit
4
VCC_1
-
Power supply terminal
5
FM_MIXOUT
O
Output terminal for FM mixer
6
GND_1
-
Ground
7
IF_BUFFER
O
IF buffer output
8
ST_IND
O
Stereo indicator output
9
AM_MIXOUT
O
Output terminal for AM mixer
10
FM_IF IN
I
Input of FMIF signal
11
AM_IF IN
I
Input of AMIF signal
12
AGC
I
AGC voltage input terminal
1-24
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21
20
19
18
VCC2
MUTE
FM
OSC
FM
MIX
SD
OSC
BUFFER
IF
BUFFER
VCC1
GND1
4
5
6
7
Function
17
16
15
PHASE
DECODER
COMP
ST SW
VCO
FF
FF
FF
TRIG
FM
ST
S-METER
FM
IF
8
9
10
Pin
I/O
No.
Symbol
13
FM_DET
O
FM detection signal output
14
ST/MON_SW
I
Stereo/Monaural switching signal input
15
AM/FM_SW
I
AM/FM switching signal input
16
L_OUT
O
Output L-channel
17
R_OUT
O
Output R-channel
18
MPX_IN
I
Multiplex signal input
19
DET_OUT
O
AM/FM detection output
20
FM_OSC
-
FM local oscillation circuit
21
VCC_2
-
Power supply terminal
22
FM_RFOUT
O
Output of FMRF signal
23
GND_2
-
Ground
24
FM_RFIN
I
Input of FMRF signal
14
13
PILOT
FM
DET
DET
AM
AGC
DET
AM
IF
11
12
Function
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