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| 型号： | TPA4411MRTJR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, TQFN-20 |
| 文件页数： | 8/32页 |
| 文件大小： | 1252K |
| 代理商： | TPA4411MRTJR |
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C
O
C
O
V
OUT
V
OUT
GND
V
DD
V
DD
V
/2
DD
V
BIAS
Conventional
Capless
GND
V
DD
V
SS
V
BIAS
DirectPath
TM
Input-Blocking Capacitors
fc
IN +
1
2p R
IN CIN
C
IN +
1
2p fc
IN RIN
or
(3)
SLOS430E – AUGUST 2004 – REVISED MARCH 2008
Figure 64. Amplifier Applications
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, and does not place any voltage on the sleeve. The bottom block diagram and
waveform of Figure 64 illustrate the ground-referenced headphone architecture. This is the architecture of the
TPA4411.
DC input-blocking capacitors are required to be added in series with the audio signal into the input pins of the
TPA4411 and TPA4411M. These capacitors block the DC portion of the audio source and allow the TPA4411
and TPA4411M inputs to be properly biased to provide maximum performance.
These capacitors form a high-pass filter with the input impedance of the TPA4411 and TPA4411M. The cutoff
frequency is calculated using Equation 3. For this calculation, the capacitance used is the input-blocking
capacitor and the resistance is the input impedance of the TPA4411 or TPA4411M. Because the gains of both
the TPA4411 and TPA4411M are fixed, the input impedance remains a constant value. Using the input
impedance value from the operating characteristics table, the frequency and/or capacitance can be determined
when one of the two values are given.
16
Copyright 2004–2008, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA4411MRTJRG4 | 功能描述:音频放大器 80mW Cap-free Stereo Headphone Driver RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA4411MRTJT | 功能描述:音频放大器 80mW Cap-free Stereo Headphone Driver RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA4411MRTJT | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS AB, 80mW QFN-20 |
| TPA4411MRTJTG4 | 功能描述:音频放大器 80mW Cap-free Stereo Headphone Driver RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA4411RTJ | 制造商:TI 制造商全称:Texas Instruments 功能描述:80-mW CAPLESS STEREO HEADPHONE DRIVER |
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