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| 型号： | TA2022AFN |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 16/18页 |
| 文件大小： | 1665K |
| 代理商： | TA2022AFN |
TA2022AFN
2002-10-30
7
Application Note
1. Power switch
It is necessary to connect an external pull-down resistor with the terminal of PW SW (pin (23)), in case that this
IC is turned on due to external noise etc.
2. Mode switch
The terminal of AM / FM changeover is pin(19).
In controlling the AM / FM mode with voltage, it is applied as follows.
VCC : AM mode
OPEN: FM mode
In FM mode, care should be taken to eliminate influence due to external noise etc, because this terminal is
opened.
The leak current flows through this terminal, in the case that the terminal is connected to VCC line
independently, even through this IC is off mode (the terminal of PW SW (pin(23)) is off mode).
3. IF count output
IF count signal can be taken from IF output terminal (pin(10)), when IF request terminal (pin(11)) is connected
with GND through RSEN and stop pulse sensitivity is on.
Switch Condition
Pin(11)
Pin(19)
Output
Frequency
Output
Voltage (typ.)
Output
Impedance (typ.)
FM
OPEN
10.7MHz
80mVp-p
AM
(RSEN ≤ 100k)
VCC
450kHz
100mVp-p
2 k
Table.1 IF count output
4. FM stop pulse sensitivity
FM stop pulse sensitivity can be changed by
connecting an external resistor RSEN
between IF request terminal (pin(11)) and
GND. The gain of FM IF amplifier is
controlled by RSEN, and FM stop pulse
sensitivity is changed.
It is advised that RSEN is 100k or less.
Fig.1 SP2
- RSEN
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