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HX-Z1
5.18LA1838 (IC1): FM AM IF amp & Detector, FM MPX decoder
• Pin layout / Block Diagram
• Pin Function
PinNo. Symbol
I/O Function
1
FM IN
I
This is an input terminal of FM IF signal.
2
AM MIX
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.
5
GND
-
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.
11
FM VSM
O Adjust FM SD sensitivity.
12
AM VSM
O Adjust AM SD sensitivity.
13
MUTE
I/O When the signal of IF REQ of IC121(
LC72131) appear, the signal of FM/AM
IF output. //Muting control input.
14
FM/AM
I
Change over the FM/AM input.
"H" :FM, "L" : AM
15
MONO/ST
O Stereo : "H", Mono: "L"
50
PinNo. Symbol
I/O Function
16
L OUT
O Left channel signal output.
17
R OUT
O Right channel signal output.
18
L IN
I
Input terminal of the Left channel post
AMP.
19
R IN
I
Input terminal of the Right channel
post AMP.
20
RO
O Mpx Left channel signal output.
21
LO
O Mpx Right channel signal output.
22
MPX IN
I
Mpx input terminal
23
FM OUT
O FM detection output.
24
AM DET
O AM detection output.
25
AM AGC
I
This is an AGC voltage input terminal
for AM
26
AFC
-
This is an output terminal of voltage
for FM-AFC.
27
AM RF
I
AM RF signal input.
28
REG
O Register value between pin 26 and pin28
besides the frequency width of the input
signal.
29
AM OSC
-
This is a terminal of AM Local oscillation
circuit.
30
OSC BUFFER
O AM Local oscillation Signal output.
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