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參數(shù)資料
| 型號(hào)： | AN7280S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | FM Front-end IC for Car Radio |
| 中文描述： | AUDIO TUNER, PDSO20 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-20 |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 81K |
| 代理商： | AN7280S |
ICs for FM/AM Tuner
AN7280S
I
Operational Description
Loop AGC
The AN7280S uses 2Loop AGC for AGC circuit. 2Loop AGC controls AGC output by using mixer output (IFT first side)
signal and FM–IF control voltage (level meter output), which is a very favorable system for disturbance characteristics,
etc.
RF–Amp.
Mixer
IFT
IF–Amp.
Control Voltage Output
To N.C.
AGC start point (Mixer input level at V
AGC
< 3V) changes in proportion to Pin6 external resistance (following R
1
) , Pin
7 applied voltage (Determine IF control voltage by R
2
, R
3
resistance division) SSC ON/OFF
· Variable width at R
1
28dB (however, V
7
≥
3V, V
9
= 0V)
· Variable width at R
7
40dB (however, R
1
=
∞
, V
9
= 0V)
· Variable width at R
9
10dB (however, R
1
=
∞
, V
7
≥
3V)
3
V
AGC
about 4.7V
5
6
7
9
R
1
R
2
R
3
V
REF
AGC Output
AGC–Adj
Vcont IN
SSC IN
from microcomputer
FM–IF
Control voltage
SSC
Change AGC start point by microcomputer control signal at seek/reception time.
Use at SSC ON ········V
9
> 3.5V
Use at SSC OFF········V
9
< 1.5V
* SSC is designed as precondition for switching operation at microcomputer control signal.
FM–IF
AGC
Amp.
AGC
Det.
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