STV8225 ( AM SIF Circuit )
(1) General Description
The STV8225 is intended for the demodulation of the AM sound of the L standard.
(2) Feature
•
sound AM synchronous demodulator
•
AM/FM audio switch and AV/TV audio switch
(3) Block Diagram
(4) Pin Description
PIN SYMBOL DESCRIPTION
1, 14 IF in IF input
2 AGC AGC capacitor
3 GND ground
4 level sw level switch of AF output voltage (pin7,9)
- open : 250 mVrms
- ground : 500 mVrms
5 FM in FM sound input
6 mute mute input
7 main in main sound input
8 n.c
9 ext out external sound output
10 sw in switching input
voltage mode connection
pin7 pin 9
2.3V below TV/FM A C
4.6V below TV/AM A A
6.8V below AV/AM B A
6.8V above AV/FM B C
11 ext in external sound input
12 Vcc supply voltage (+9V)
13 mean cap mean capacitor
24
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