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TDA7220D Datenblatt(PDF) 6 Page - STMicroelectronics

Teilenummer TDA7220D
Bauteilbeschribung  VERY LOW VOLTAGE AM-FM RADIO
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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AM-FM SWITCHING
AM-FM switching is achieved by applying a DC voltage at pin 13, to switch the internal reference.
TYPICAL DC VOLTAGE (refer to the test circuit)
Pins
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Unit
AM
3
1.1
3
1.1
1.1
2.5
3
0.7
1.2
3
0
2.1
2.1
2.9
3
2.9
V
FM
3
0
3
0
0
2.4
3
0
0.9
3
0
3
3
2.7
2.7
2.7
V
APPLICATION SUGGESTION
Recommended values referred to the test circuit of Figure 1
Part
Number
Recommended
Value
Purpose
Smaller than
Recommended Value
Larger than
Recommended Value
C1
100
µF
AGC Bypass
Increase of the distortion at
low audio frequency
Increase of the AGC time
constant
C2 (1)
100nF
AM Input DC Cut
C3 (1)
10nF
FM Input DC Cut
C4
C5
20nF
20nF
FM Amplifier Bypass
Reduction of sensitivity
- bandwidth increase
- higher noise
C7
100nF
FM detector Decoupling
Danger of RF Irradiation
C8
100nF
Power Supply Bypass
Noise increase of the audio
output
C9
10
µF
AGC Bypass
Increase of the distortion at
low audio frequency
Increase of the AGC time
constant
C10 (1)
56pF
Tuning of the AM
Oscillator at 1455kHz
C11
10nF
50ms FM De-emphasis
C12
100nF
Output DC Decoupling
Low audio frequency cut
C13
220
µF
Power Supply Decoupling
Increase of the distortion at
low frequency
C16
2.7nF
AM Detector capacitor
Low suppression of the IF
frequency and harmonics
Increase of the audion
distortion
R1 (1)
68
FM Input Matching
R2 (1)
56
AM Input Matching
R3
330
Ceramic Filter Matching
R4
6.8k
FM Detector Coil Q Setting
Audio output decrease and
lower distortion
Audio output increase and
higher distortion
R5
560
FM Detector Load Resistor
Audio output decrease and
higher AMR
R6
13k
AM Detector Coil Q Setting
Lower IF Gain and Lower
AGC Range
Higher IF Gain and Lower
AGC Range
(1) Only for test circuit.
TDA7220
6/16


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