TDA1220 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA1220 Datasheet PDF : 18 Pages
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TDA1220B
APPLICATION SUGGESTION
Reccomended values are referred to the test circuit of Fig. 2.
Part
number
C1
C2 (*)
C3 (*)
C4
C5
C6
C7
C8
C9
C10 (*)
C11
C12
C13
C16
Recommended
value
Purpose
100 µF
AGC bypass
100 nF
10 nF
20 nF
20 nF
68 pF
100 nF
100 nF
AM input
DC cut
FM input
DC cut
FM amplifier bypass
Ceramic filter coupling
FM detector decoupling
Power supply bypass
10 µF
AGC bypass
56 pF
6.8 nF
100 nF
220 µF
2.7 nF
Tuning of the AM
oscillator at 1455 KHz
50 µs
FM de-enphasis
Output DC
decoupling
Power supply
decoupling
AM detector capacitor
R1 (*)
R2 (*)
R3
68 ohm
56 ohm
330 ohm
R4
8.2 Kohm
R5
560 ohm
R6
82 Kohm
R7
2.2 Kohm
R8
3.3 Kohm
(*) Only for test circuit
FM input matching
AM input matching
Ceramic filter matching
FM detector
coil Q setting
FM detector
load resistor
AM detector
coil Q setting
455 KHz IF filter
matching
455 KHz IF filter
matching
Smaller than
recommended value
Larger than
recommended value
Increase of the distortion Increase of the AGC time
at low audio frequency constant
Reduction of sensitivity – Bandwidth increase
– Higher noise
IF bandwidth reduction IF bandwidth increase
Danger of RF irradiation
Noise increase of the
audio output
Increase of the distortion Increase of the AGC time
at low audio frequency constant
Low audio frequency cut
Increase of the distortion
at low frequency
Low suppression of
the IF frequency and
harmonics
Increase of the audio
distortion
Audio output decrease
and lower distortion
Audio output decrease
and higher AMR
Audio output increase
and higher distortion
Lower IF gain and Lower
AGC range
Higher IF gain and lower
AGC range
8/18
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