ICs for TV
1
AN8946SB
FM demodulation IC for BS/CS broadcasting
n Overview
The AN8946SB is a 5 V single power supply and low
power consumption FM demodulation IC for BS/CS broad-
casting. It features PLL · FM demodulation, 2nd IF AGC
amp., AGC detection and AFC (applicable to both mean
value and keyed types).
n Features
• 5 V single power source
• Low power dissipation (typ. 170 mW)
• S/N 65 dB or more
• Inter-modulation interference ratio: 50 dB or more
• AGC amp built in (Reduction range: 55 dB)
• Adjustment-free VCO coil
n Applications
• BS/CS tuner, television
n Block Diagram
SSOP028-P-0375A
Unit : mm
GND
V
CC
5 V
V
CC
5 V Re
g. out
2.6 V
GND GND
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1 2 3 5 7 94 6 8
10 11 12 13 14
Key Comp.
Latch
VCO REG
AFC
amp.
PD
Loop
amp.
Video
amp.
IF
amp.
DC
amp.
DC
amp.
AGC
amp.
0.3±0.1
0.1±0.1
(0.4)
2.05±0.2
0.9±0.1
0.9±0.1
0.2
+0.1 –0.05
1
11.6±0.3
9.3±0.3
7.2±0.3
14
28
15
0.8