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參數(shù)資料
| 型號： | TA2120FNG |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.008 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | 0.300 INCH, 0.65 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 15/17頁 |
| 文件大小： | 252K |
| 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, PWA and PWB are turned off. The current of the beep signal input to been via beep
amplifier is amplified at the output stage of PWA and PWB. 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 VCC, 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 (PWC)
Terminal for PWC output is common terminal for OCL output configuration.
PWC ON/OFF mode is controlled by PWC switch (Pin 4).
To reduce the consumption current, PWC should be turned off by this switch.
PWC SW OPEN: OCL
VCC: C-Couple
4.
Terminal of RF IN (3pin)
Adding Capacitor (Recommendation: 10 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)
VCC
200 ms
OFF
100 ms
ON
OFF
ON
OFF
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