LA1781M_09 Datasheet, PDF (7/48 Pages) Sanyo Semicon Device – For Car Radios Single-Chip Tuner IC

Continued from preceding page.
Pin No.
Pin function
8
Noise AGC sensitivity
9
AGC adjustment
LA1781M
Pin description
After setting up the medium field
(about 50dBμ) sensitivity with the
noise sensitivity setting pin (pin 8), set
the weak field (about 20 to 30dBμ)
sensitivity with the AGC adjustment
pin (pin 9).
Equivalent circuit
3kΩ
3kΩ
15kΩ
200Ω
11
Memory circuit connection
12
Recording circuit used during noise
canceller operation.
8
3kΩ
0.01μF
1MΩ
9
+
0.47μF
0.01μF
6800pF
3.9kΩ
13
12
11
VCC
Differential
amp
Gate
circuit
13
Pilot input
Pin 13 is the PLL circuit input pin.
14
N.C, MPX, MRC, GND
Ground for the N.C., MPX, and MRC
circuits.
LPF
30kΩ
N.C
12
13
0.01μF
VCC
PLL
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