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RX-7001PGD
LA1838(IC102): FM AM IF AMP&detector, FM MPX Decoder
1. Block Diagram
30
29
28
REG
AM
AM
ALC
MIX
OSC
BUFF
SD
COMP
FM
S-CLRVE
S-METER
PM
FM IF
DET
1
2
2. Pin Function
Pin
Symbol
I/O
No.
FM IN
I
This is an input terminal of FM IF
1
signal.
AM MIX
2
O
This is an out put terminal for AM
mixer.
3
FM IF
I
Bypass of FM IF
4
AM IF
I
Input of AM IF Signal.
GND
5
This is the device ground terminal.
6
TUNED
O
When the set is tunning,this terminal
becomes "L".
7
STEREO
O
Stereo indicator output. Stereo "L",
Mono: "H"
8
VCC
This is the power supply terminal.
9
FM DET
FM detect transformer.
10
AM SD
This is a terminal of AM ceramic filter.
O
11
FM VSM
Adjust FM SD sensitivity.
AM VSM
12
O
Adjust AM SD sensitivity.
13
I/O
MUTE
When the signal of IF REQ of IC121(
LC72131) appear, the signal of FM/AM
IF output. //Muting control input.
Change over the FM/AM input.
14
FM/AM
I
"H" :FM, "L" : AM
MONO/ST O
Stereo : "H", Mono: "L"
15
1-16
27
26
25
FM
RF.AMP
AGC
DET
AM IF
AM
S-METER
AM/FM
IF-BUFF
TUNING
DRIVE
GND
5
3
4
6
Function
24
22
21
23
DECODER
ANIT-BIRDIE
STEREO
P-DET
VCO
384KHz
STEREO
DRIVE
VCC
8
9
7
10
Pin
I/O
Symbol
No.
16
O
R OUT
17
L OUT
O
18
R IN
I
19
L IN
I
20
O
RO
21
LO
O
22
IF IN
I
23
O
FM OUT
24
AM DET
O
25
AM AGC
I
26
AFC
27
I
AM RF
REG
28
O
29
AM OSC
30 OSC BUFFER
O
20
19
18
17
MUTE
5N
SW
FF
FF
PILOT
FF
38k
/
19k
19k
LS
DET
2
/
11
12
13
14
Function
Right channel signal output.
Left channel signal output.
Input terminal of the Right channel post
AMP.
Input terminal of the Left channel
post AMP.
Mpx Right channel signal output.
Mpx Left channel signal output.
Mpx input terminal
FM detection output.
AM detection output.
This is an AGC voltage input terminal
for AM
This is an output terminal of voltage
for FM-AFC.
AM RF signal input.
Register value between pin 26 and pin28
besides the frequency width of the
input signal.
This is a terminal of AM Local
oscillation circuit.
AM Local oscillation Signal output.
16
15
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