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參數(shù)資料
| 型號(hào)： | TA2120FNG |
| 廠商： | Toshiba Corporation |
| 英文描述： | Low Consumption Current Stereo Headphone Power Amplifier for Portable CD (3V Use) |
| 中文描述： | 低功耗電流立體聲耳機(jī)功率放大器便攜式CD（3V的使用） |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 256K |
| 代理商： | TA2120FNG |
TA2120FNG
2006-04-19
7
Application Note
1. Beep Sound
Beep sound signals from, for example, a micro controller can be received through the beep input pin 17. At
power mute mode, PW
A
and PW
B
are turned off. The current of the beep signal input to been via beep
amplifier is amplified at the output stage of PW
A
and PW
B
. The output from beep amplifier becomes the
constant voltage source. As a result, the beep sound is output to the headphone load.
If the input signal for beep (Pin 17) is not, this terminal should be fixed GND level.
2. Power Switch
As long as the power switch is not connect to V
CC
, the IC does not operate.
If external noise causes malfunctions, we recommend to connect a pull-down resistor externally (Sensitivity
of the power mute switch is high).
3. Center Amplifier (PW
C
)
Terminal for PW
C
output is common terminal for OCL output configuration.
PW
C
ON/OFF mode is controlled by PW
C
switch (Pin 4).
To reduce the consumption current, PW
C
should be turned off by this switch.
PW
C
SW OPEN: OCL
V
CC
: C-Couple
4. Terminal of RF IN (3pin)
Adding Capacitor (Recommendation: 10
μ
F) to terminal of RF IN (Pin 3), the ripple rejection ratio is
improved by secondly ripple filter (In the C-Couple output configuration , this capacitor should be
connected.)
BEEP IN
(17pin)
MT SW
(19pin)
PW SW
(20pin)
V
CC
200 ms
OFF
100 ms
100 ms
ON
OFF
OFF
ON
OFF
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