參數(shù)資料
型號(hào)： TA2022AFNG
廠商： Toshiba Corporation
英文描述： 1.5V AM/FM IF + MPX
中文描述： 1.5V的調(diào)幅/調(diào)頻中頻盈豐
文件頁(yè)數(shù)： 7/18頁(yè)
文件大?。?/td> 1679K
代理商： TA2022AFNG
TA2022AFNG
2006-04-11
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.
V
CC
: 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 V
CC
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 R
SEN
and stop pulse sensitivity is on.
Switch Condition
Pin(11)
Pin(19)
Output
Frequency
Output
Voltage (typ.)
Output
Impedance (typ.)
FM
OPEN
OPEN
10.7MHz
80mV
p
p
AM
(R
SEN
≤
100k
)
V
CC
450kHz
100mV
p
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 R
SEN
between IF request terminal (pin(11)) and
GND. The gain of FM IF amplifier is
controlled by R
SEN
, and FM stop pulse
sensitivity is changed.
It is advised that R
SEN
is 100k
or less.
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