LA1787M
FM Soft Muting (2)
R47 = 7.5 k?
Fig.21
DET out
FM Soft Muting (3)
R47 = 7.5 k?
Fig.22
DET out
10 k?
15 k?
10 k?
15 k?
200 k ?
30 k ?
20 k?
Noi
se
2 0k?
Nois
e
VCC
Antenna input — dB μ
Antenna input — dB μ
200 k ?
R
Quadrature detector
Mute amp.
(VCA)
+
R
+
N-AGC
R
Mute
drive
Limiter
58
33
31
DET out
To MIX out
Open
200 k ?
30 k ?
? FM muting off function
Forcing this pin to the ground level turns muting off.
Detector
Fig. 23
A11767
output
0
1
20
When the pin is at the ground level, the noise convergence will
be 10 dB and the –3 dB limiting sensitivity will be about 0 dB μ .
Antenna input
A12082
Fig. 24
No. 6655-34/54
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