LA1787M Datasheet, PDF (7/54 Pages) Sanyo Semicon Device – Single-Chip Tuner IC for Car Radios

Continued from preceding page.
Pin No.
Function
LA1787M
Description
Equivalent circuit
8
Noise AGC sensitivity
9
AGC adjustment
After setting up the medium field
(about 50 dBµ) sensitivity with the
noise sensitivity setting pin (pin 8),
set the weak field (about 20 to
30 dBµ) sensitivity with the AGC
adjustment pin (pin 9)
11
12
Memory circuit connection
Recording circuit used during
noise canceller operation.
3kΩ
15kΩ
3kΩ
200Ω
8
3kΩ
0.01µF
1MΩ
9
+
0.47µF
A13559
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
A13560
VCC
PLL
A13561
Continued on next page.
No. 6655-7/54