LA1787M Datasheet, PDF (28/54 Pages) Sanyo Semicon Device – Single-Chip Tuner IC for Car Radios

Notes on 3D AGC (Keyed AGC)
LA1787M
VCC
55
W-AGC
DET
58
N-AGC
DET
90µA
S-meter
+
–
VCC
+
–
1
2
39
24
ANT
DUMPING
+
Fig. 8
VS-meter
A11763
• The antenna damping current from the pin due to the pin diode flows when the V2 pin reaches the V_CC - V_BE
level.
• The narrow AGC operates as follows.
When pin V39 > pin V24: The narrow AGC turns off.
When pin V39 < pin V24: The narrow AGC turns on.
No. 6655-28/54