Baza Porad Serwisowych
100k
1S2236
10µH
0.47µF
L1 22pF L2 L3
L4
22pF
ST FM 10k
330pF 1µF 1µF
1k
5pF
10µF
4.7µF
10nF 10nF
1000pF
15k
L OUT
MO
AM
41k
15pF
0.33µF
R OUT
VCC1 FM OSC AM OSC DET OUT MPX IN LPF1 LPF2
AM RF IN FM RF OUT VCO
19
24 23 22 21 20 18 17 16 15 14 13
4.7µF
PRE
FM AM
VCO ST DECODER
AM
OSC OSC
Pbase Pbase
AF
COM COM
HYS SW
1/2
AM/FM
SWMONO
1/2 1/2
AM
DET
TDA7222A
FM FM AM AM AM LEVEL TUN ST FM
RF MIX MIX AGC IF DET FM
LED LED DET
IF
2 3 4 5 6 78 9 10 11 12
1
VCC2 AM IF IN IF FM IN GND2 LED TUN ST LED QUAD
FM RF IN GND1 FM MIX AM MIX AM AGC
BPW B5
33µF
SFE
BFP
5.6k
10.7MA5
33pF
SFU455B
100
560 560
T1 T2
T3
VCC (3V)
22µF
Rys.35. Schemat blokowy, aplikacja i opis wyprowadzeń układu TDA7222A/AD.
FM RF IN 1 28 AM RF IN
FM RF IN 1 24 AM RF IN
GND1 2 27 FM RF OUT
GND1 2 23 FM RF OUT
FM MIX 3 26 VCC1
FM MIX 3 22 VCC1
N.C. 4 25 FM OSC
AM MIX 4 21 FM OSC
AM MIX 5 24 N.C.
AGC 5 20 AM OSC AGC 6 23 AM OSC
VCC2 7 22 DET OUT
VCC2 6 19 DET OUT
AM IF IN 8 21 MPX IN
AM IF IN 7 18 MPX IN
FM IF IN 9 20 LPF1
FM IF IN 8 17 LPF1
N.C. 10 19 LPF2
GND2 9 16 LPF2
GND2 11 18 N.C.
TUN LED 10 15 VCO
TUN LED 12 17 VCO
ST LED 11 14 LOUT
ST LED 13 16 L OUT
QUAD 12 13 R OUT
QUAD 14 15 R OUT
SERWIS ELEKTRONIKI
5pF
100k
TDA7222A
TDA7222AD