FS-J60
4.8 LA1838 (IC1): FM AM IF AMP&detector, FM MPX Decoder
? Block Diagram
302928272625242322212019181716
REG
AM
ALCAMMIXFMRF.AMP DECODER
ANIT-BIRDIE
OSCMUTE
BUFF
STEREO
P-DET 5N
SW
AGC
AM IFDET
VCOFFFFFFPILOT
SD38k19k/DET
384KHz219k/LS
COMP
AM
S-METER
FMAM/FM
S-METERS-CLRVEIF-BUFF
TUNINGSTEREO
DRIVE DRIVE
PM
FM IFDET
GNDVCC
123456789101112131415
? Pin Function
Pin No.SymbolI/OFunction
1FM INIThis is an input terminal of FM IF signal.
2AM MIXO This is an out put terminal for AM mixer.
3FM IFIBypass of FM IF
4AM IFIInput of AM IF Signal.
5GND- This is the device ground terminal.
6TUNEDO When the set is tunning,this terminal becomes "L".
7STEREOO Stereo indicator output. Stereo "L", Mono: "H"
8VCC- This is the power supply terminal.
9FM DET- FM detect transformer.
10AM SD- This is a terminal of AM ceramic filter.
11FM VSMO Adjust FM SD sensitivity.
12AM VSMO Adjust AM SD sensitivity.
13MUTEI/O When the signal of IF REQ of IC121(LC72131) appear, the signal of FM/AM IF output. //Muting
control input.
14FM/AMIChange over the FM/AM input. "H" :FM, "L" : AM
15MONO/STO Stereo : "H", Mono: "L"
16L OUTO Left channel signal output.
17R OUTO Right channel signal output.
18L INIInput terminal of the Left channel post AMP.
19R INIInput terminal of the Right channel post AMP.
20ROO Mpx Right channel signal output.
21LOO Mpx Left channel signal output.
22MPX INIMpx input terminal
23FM OUTO FM detection output.
24AM DETO AM detection output.
25AM AGCIThis is an AGC voltage input terminal for AM
26AFC- This is an output terminal of voltage for FM-AFC.
27AM RFIAM RF signal input.
28REGO Register value between pin 26 and pin28 besides the frequency width of the input signal.
29AM OSC- This is a terminal of AM Local oscillation circuit.
30OSC BUFFERO AM Local oscillation Signal output.
(No.22052)1-29 |
ACEC
