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參數(shù)資料
| 型號： | TDA7220D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | VERY LOW VOLTAGE AM-FM RADIO |
| 中文描述： | 極低電壓上午，調(diào)頻收音機 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 381K |
| 代理商： | TDA7220D |
AM-FM SWITCHING
AM-FM switching is achievedby applying a DC voltage at pin 13, to switch the internalreference.
TYPICALDC VOLTAGE(refer to the test circuit)
Pins
AM
FM
1
3
3
2
3
3
3
4
5
6
7
3
3
8
9
10
3
3
11
0
0
12
2.1
3
13
2.1
3
14
2.9
2.7
15
3
2.7
16
2.9
2.7
Unit
V
V
1.1
0
1.1
0
1.1
0
2.5
2.4
0.7
0
1.2
0.9
APPLICATION SUGGESTION
Recommendedvalues referred to the test circuit of Figure 1
Part
Number
C1
Recommended
Value
100
μ
F
Purpose
Smaller than
Recommended Value
Increase of the distortion at
low audio frequency
Larger than
Recommended Value
Increase of the AGC time
constant
AGC Bypass
C2 (1)
C3 (1)
C4
C5
C7
C8
100nF
10nF
20nF
20nF
100nF
100nF
AM Input DC Cut
FM Input DC Cut
FM Amplifier Bypass
Reduction of sensitivity
- bandwidth increase
- higher noise
FM detector Decoupling
Power Supply Bypass
Danger of RF Irradiation
Noise increase of the audio
output
Increase of the distortion at
low audio frequency
C9
10
μ
F
AGC Bypass
Increase of the AGC time
constant
C10 (1)
56pF
Tuning of the AM
Oscillator at 1455kHz
50ms FM De-emphasis
Output DC Decoupling
Power Supply Decoupling
C11
C12
C13
10nF
100nF
220
μ
F
Low audio frequency cut
Increase of the distortion at
low frequency
Low suppression of the IF
frequency and harmonics
C16
2.7nF
AM Detector capacitor
Increase of the audion
distortion
R1 (1)
R2 (1)
R3
R4
68
56
330
6.8k
FM Input Matching
AM Input Matching
Ceramic Filter Matching
FM Detector Coil Q Setting
Audio output decrease and
lower distortion
Audio output decrease and
higher AMR
Lower IF Gain and Lower
AGC Range
Audio output increaseand
higherdistortion
R5
560
FM Detector Load Resistor
R6
13k
AM Detector Coil Q Setting
Higher IF Gain and Lower
AGC Range
(1) Only fortest circuit.
TDA7220
6/16
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