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參數資料
| 型號： | TS4982IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, QFN-32 |
| 文件頁數： | 14/31頁 |
| 文件大小： | 537K |
| 代理商： | TS4982IQT |
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TS4982
Application information
Doc ID 14527 Rev 2
21/31
4.7
PC beep
The PC beep input allows to send a system beep (for instance power-on self-test error
code) through the amplifiers to the loudspeaker or (and) headphone output. In the typical
application (see Figure 1) the input is passed through when eight sequential rising edges in
the signal appear on the detector input with the minimum amplitude VinMIN =0.8 VP-P and
minimum frequency FMIN = 400 Hz. The PC beep signal is mixed with gain = -1 V/V into a
loudspeaker (SPKREN = 0) or headphone (HDEN = 1) path. The signal from the
loudspeaker or headphone inputs are not muted. The beep signal pass-through is switched
off when there is no signal with sufficient amplitude VinMIN present during a 1/FMIN (1/400 s)
time period.
The overall gain in the typical application (Rin = Rfeed = 47 k
Ω) is equal to the loudspeaker
or headphone gain setting.
Figure 42.
PC beep input stage
The input capacitor Cinbeep with input resistor Rin forms a high-pass filter with a -3 dB low
frequency cut-off FCL which must be lower than FMIN.
For a typical application (Rin = 47 k
Ω, FMIN = 400 Hz) a good choice is Cinbeep = 47 nF.
If it is necessary to change the minimum amplitude VinMIN = 0.8 VP-P the gain of the PC
BEEP input amplifier has to be changed. For a typical application (Rin = Rfeed = 47 k
Ω) the
gain is -1 V/V.
If VinMIN2 is a new requested minimum amplitude then a new input resistor Rin is:
47nF
Cinbeep
PC BEEP INPUT
47k
Rin
47k
Rfeed
PC BEEP
Internal (TS4982)
External
Avbeep
VOLT. & FREQ.
GND
Vin
DETECTOR
GND
LOUDSPEAKER
AUDIO INPUT
HEADPHONE
AUDIO INPUT
Cinbeep
1
2
π Rin F
MIN
--------------------------------------------
≥
Av
Rfeed
Rin
-----------------
47000
----------------
1
–
=
–
=
–
=
Rin
Ω
[]
Rfeed
Vin
MIN2
Vin
MIN
----------------------------------------------
5875
Vin
MIN2 VPP
[]
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4984 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
| TS4984EIJT | 功能描述:音頻放大器 2x1.2W stereo audio RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4984EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984IQT | 功能描述:音頻放大器 2x1W stereo audio Pwr amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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