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50
5.18LA1838 (IC1): FM AM IF amp & Detector, FM MPX decoder
• Pin layout / Block Diagram
• Pin Function
PinNo. Symbol
I/O Function
PinNo.
Symbol
I/O Function
1
FM IN
I
This is an input terminal of FM IF signal.
16
L OUT
O
Left channel signal output.
2
AM MIX
O This is an out put terminal for AM mixer.
17
R OUT
O
Right channel signal output.
3
FM IF
I
Bypass of FM IF
18
L IN
I
Input terminal of the Left channel post
AMP.
4
AM IF
I
Input of AM IF Signal.
19
R IN
I
Input terminal of the Right channel
post AMP.
5
GND
-
This is the device ground terminal.
20
RO
O
Mpx Left channel signal output.
6
TUNED
O When the set is tunning,this terminal
becomes "L".
21
LO
O
Mpx Right channel signal output.
7
STEREO
O Stereo indicator output. Stereo "L",
Mono: "H"
22
MPX IN
I
Mpx input terminal
8
VCC
-
This is the power supply terminal.
23
FM OUT
O
FM detection output.
9
FM DET
-
FM detect transformer.
24
AM DET
O
AM detection output.
10
AM SD
-
This is a terminal of AM ceramic filter.
25
AM AGC
I
This is an AGC voltage input terminal
for AM
11
FM VSM
O Adjust FM SD sensitivity.
26
AFC
-
This is an output terminal of voltage
for FM-AFC.
12
AM VSM
O Adjust AM SD sensitivity.
27
AM RF
I
AM RF signal input.
13
MUTE
I/O When the signal of IF REQ of IC121(
LC72131) appear, the signal of FM/AM
IF output. //Muting control input.
28
REG
O
Register value between pin 26 and pin28
besides the frequency width of the input
signal.
14
FM/AM
I
Change over the FM/AM input.
"H" :FM, "L" : AM
29
AM OSC
-
This is a terminal of AM Local oscillation
circuit.
15
MONO/ST
O Stereo : "H", Mono: "L"
30
OSC BUFFER
O
AM Local oscillation Signal output.
Содержание HX-Z1
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