JVC CA-C55BK - IC Descriptions - FM MPX Detector; LA3401 (IC105) Function, Layout, and Diagram

XT-C55BK
Me LA3S407 C105): FM MPX Detector
1. The main function descriptions
(1) Detect the FM Muitiplex Signal (Stereo signal ).
(2) When receiving FM Stereo Signal, it outputs the signal for indicator.
(8) AM/FM Audio Amplifier.
(1) Terminal Layout 2. Block Diagram ae
Ts MONo | Ties on}
LEP STEREO ii>off 5
PLL Mute Mute
vec VCO LPF LPF in LPF LPF in. Cont STEREO GND
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AM in Vee
FM in 1 vco I | IsTEREO=L } I
Pilot
LPF
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Phase
Pilot
Det.
[MONO->H
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Sepa
LPF
Comparator{
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LH
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Lout PLLin | 77 I
Rin LPF Symmetrical
Rout
Mute
in
I
Reactance
I
mute Mute Cont | Circuit i
FM/AM Edi0 STEREO
Mute out O11 GND | FF del wane LL kHz FF y kHz Stereo |
r XN 38 ee Switch j
I 3 I
L. / - S Muting Control Mutin i
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FM AM Selection ese Out
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| Muting "
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16 | is} {9} [10] a
AM in FM in Pilot Separ. L out Post Amp. in. R out Mute Fm/AM Mute
out Adj. L R Cont Change over out
Description
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2.
Separation adjustment.
Left channel signal output.
a toe Reversal output of Pin5.
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|
0 |
| O |
——— ——
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| FM/AM | 1 [Change over the FM/AM input. oH: “LS EM
| Mute out | — | Not use
0 |
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Stereo indicator output. Stereo: “L”, Mono: "H”
Mute Cont The mute time is controlled by the connected capacitor when changing over the FM/AM
Mut signal input.“H“: Mute on, “L” : Mute off.
Low pass filter of pilot detector
While this terminal goes to “H”, the VCO stop.
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[1 [Vortage controlled oscillator terminal” SSS
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Mute in
LPF
(No.20474) 3-11