參數(shù)資料
型號(hào)： TPA0112PWPG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 21/34頁(yè)
文件大小： 655K
代理商： TPA0112PWPG4
www.ti.com
ROUT+
21
R
MUX
RHPIN
RLINEIN
+
23
20
8
RIN
ROUT
16
+
1 k
COUTR
330
F
100 k
SE/BTL
15
100 k
VDD
Volume
Control
Volume
Control
PC-BEEP OPERATION
TPA0112
SLOS204C – MAY 1999 – REVISED SEPTEMBER 2004
Figure 47. TPA0112 Resistor Divider Network Circuit
Using a readily available 1/8-in. (3,5-mm) stereo headphone jack, the control switch is closed when no plug is
inserted. When closed, the 100-k
/1-k divider pulls the SE/BTL input low. When a plug is inserted, the 1-k
resistor is disconnected and the SE/BTL input is pulled high. When the input goes high, the OUT– amplifier is
shut down causing the speaker to mute (virtually open-circuits the speaker). The OUT+ amplifier then drives
through the output capacitor (CO) into the headphone jack.
The PC-BEEP input allows a system beep to be sent directly from a computer through the amplifier to the
speakers with few external components. The input is normally activated automatically, but may be selected
manually by pulling PCB ENABLE high. When the PC-BEEP input is active, both of the LINEIN and HPIN inputs
are deselected and both the left and right channels are driven in BTL mode with the signal from PC-BEEP. The
gain from the PC-BEEP input to the speakers is fixed at 0.3 V/V and is independent of the volume setting. When
the PC-BEEP input is deselected, the amplifier returns to the previous operating mode and volume setting.
Furthermore, if the amplifier is in shutdown mode, activating PC-BEEP takes the device out of shutdown and
outputs the PC-BEEP signal, then returns the amplifier to shutdown mode.
When PCB ENABLE is held low, the amplifier automatically switches to PC BEEP mode after detecting a valid
signal at the PC BEEP input. The preferred input signal is a square wave or pulse train with an amplitude of 1.5
Vpp or greater. To be a accurately detected, the signal must have a minimum of 1.5-Vpp amplitude, rise and fall
times of less than 0.1 s and a minimum of 8 rising edges. When the signal is no longer detected, the amplifier
returns to its previous operating mode and volume setting.
When PCB ENABLE is held high, PC BEEP is selected and the LINEIN and HPIN inputs are deactivated
regardless of the input signal. PCB ENABLE has an internal 100-k
pulldown resistor and trips at approximately
VDD/2.
28
相關(guān)PDF資料
PDF描述
TPA0112PWPRG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
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TPA0112PWPRG4 功能描述:音頻放大器 St 2W APA With Int Gain Settings RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA0122 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS
TPA0122EVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA0122 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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