AN8946SB Datasheet, PDF (6/10 Pages) Panasonic Semiconductor – FM demodulation IC for BS/CS broadcasting

AN8946SB
s Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
8
8
9
200 Ω
9
2 mA
ICs for TV
Description
GND2
• GND pin except VCO, AFC and IF
amp.
Voltage
(Open)
Apply 0 V
from outside
Loop amp. output
• pin to drive a variable capacitance
diode for VCO.
1.5 V
10
Pin 10 Video amp. input
Floating
1.5 V
11
Pin 11 Video amp. output
• Pin 10 is a reverse phase input pin to
pin11.
10
• When a resistor between pin 9 and
pin 10 is R1 and a resistor between
pin 10 and pin 11 is R2, the gain is
R2/R1 and a reverse signal to pin 9 is
outputted from pin 11
100 Ω
11
11
4.2 V
10
1.5 V
500 µA
2 mA
12
Free-run frequency adjustment
1.3 V
20
• Changing pin 12 potential enables
13 kΩ
you to cancel an offset voltage of a
10 kΩ
12
loop amp.
13 kΩ
6