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參數(shù)資料
| 型號： | TPA0252PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 18/34頁 |
| 文件大?。?/td> | 851K |
| 代理商： | TPA0252PWP |
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PC-BEEP OPERATION
C
PCB w
1
2p
PCB
(100 kW)
(14)
SE/BTL Operation
ROUT+
13
R
MUX
RHPIN
RLINEIN
+
-
16
17
15
RIN
ROUT-
11
+
-
1 k
COUTR
330
F
100 k
SE/BTL
22
100 k
VDD
32-Step
Volume
Control
32-Step
Volume
Control
14
HP/LINE
TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
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 activated automatically. When the PC-BEEP input is active,
both 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, outputs the PC-BEEP signal, then returns the amplifier to shutdown mode.
The preferred input signal is a square wave or pulse train. To be 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 eight rising edges. When
the signal is no longer detected, the amplifier returns to its previous operating mode and volume setting.
To ac-couple the PC-BEEP input, choose a coupling-capacitor value to satisfy Equation 14.
The PC-BEEP input can also be dc-coupled to avoid using this coupling capacitor. The pin normally rests at
midrail when no signal is present.
The ability of the TPA0252 to easily switch between BTL and SE modes is one of its most important cost saving
features. This feature eliminates the requirement for an additional headphone amplifier in applications where
internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated.
Internal to the TPA0252, two separate amplifiers drive OUT+ and OUT–. The SE/BTL input (terminal 22) controls
the operation of the follower amplifier that drives LOUT– and ROUT– (terminals 1 and 11). When SE/BTL is held
low, the amplifier is on and the TPA0252 is in the BTL mode. When SE/BTL is held high, the OUT– amplifiers
are in a high output impedance state, which configures the TPA0252 as an SE driver from LOUT+ and ROUT+
(terminals 23 and 13). IDD is reduced by approximately one-half in SE mode. Control of the SE/BTL input can be
from a logic-level CMOS source or, more typically, from a resistor divider network as shown in Figure 39.
Figure 39. TPA0252 Resistor Divider Network Circuit
25
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0252PWPG4 | 功能描述:音頻放大器 St Class-AB Aud Amp with Dig Vol Control RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA0252PWPR | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA0252PWPRG4 | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA0253 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0253_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
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