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參數(shù)資料
| 型號： | TPA6138A2PWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.04 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 17/18頁 |
| 文件大小： | 436K |
| 代理商： | TPA6138A2PWR |
c
L
O
1
f =
2 R C
p
O
L c
1
C
=
2 R f
p
OPAMP
Co
Mute Circuit
Output
Enable
+
–
Conventional Solution
Mute Circuit
Output
Enable
3.3 V
+
–
TPA6138A2 Solution
VDD
VSS
GND
VDD
VDD/2
GND
DirectPath
9 V–12 V
SLOS704A
– JANUARY 2011 – REVISED MAY 2011
APPLICATION INFORMATION
Single-supply line-driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 7 illustrates
the conventional line-driver-amplifier connection to the load and output signal. DC blocking capacitors are often
large in value. The headphone load (typical resistive values of 16
Ω to 32 Ω) combine with the dc blocking
capacitors to form a high-pass filter. Equation 1 shows the relationship between the load impedance (RL), the
capacitor (CO), and the cutoff frequency (fC).
(1)
(2)
If fC is low, the capacitor must then have a large value because the load resistance is small. Large capacitance
values require large package sizes. Large package sizes consume PCB area, stand high above the PCB,
increase cost of assembly, and can reduce the fidelity of the audio output signal.
Figure 7. Conventional and DirectPath Line Driver
The DirectPath amplifier architecture operates from a single supply but makes use of an internal charge pump to
provide a negative voltage rail. Combining the user-provided positive rail and the negative rail generated by the
IC, the device operates in what is effectively a split-supply mode. The output voltages are now centered at zero
volts with the capability to swing to the positive rail or negative rail. The DirectPath amplifier requires no output
dc-blocking capacitors. The bottom block diagram and waveform of Figure 7 illustrate the ground-referenced
line-driver architecture. This is the architecture of the TPA6138A2.
8
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPA6138A2
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| TPA6138A2PW | 0.04 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
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| TPA6139A2PW | 0.025 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| TPA6139A2RGT | 0.025 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA6139A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DirectPatha?￠ 25-mW Headphone Amplifier With Programmable-Fixed Gain |
| TPA6139A2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6139A2EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA6139A2PW | 功能描述:音頻放大器 25mW Headphone Amp 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 |
| TPA6139A2PW | 制造商:Texas Instruments 功能描述:HEADPHONE AMPLFIER IC STEREO 32OHM 25 |
| TPA6139A2PWR | 功能描述:音頻放大器 25mW Headphone Amp 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 |
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