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參數資料
| 型號： | TPA0112PWPR |
| 元件分類： | 運動控制電子 |
| 英文描述： | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|24PIN|PLASTIC |
| 中文描述： | 音頻放大器|雙|的CMOS | TSSOP封裝| 24針|塑料 |
| 文件頁數： | 22/34頁 |
| 文件大小： | 488K |
| 代理商： | TPA0112PWPR |
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TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
The –3 dB frequency can be calculated using equation 1:
(1)
f–3 dB
1
2
C R RI
If the filter must be more accurate, the value of the capacitor should be increased while value of the resistor to
ground should be decreased. In addition, the order of the filter could be increased.
input capacitor, C
I
In the typical application an input capacitor, C
I
, is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, C
I
and the input impedance of the amplifier, Z
I
, form a
high-pass filter with the corner frequency determined in equation 2.
f
c(highpass)
1
2 Z
I
C
I
–3 dB
fc
(2)
The value of C
I
is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where Z
I
is 710 k
and the specification calls for a flat bass response down to 40 Hz.
Equation 2 is reconfigured as equation 3.
C
I
1
2 Z
I
f
c
(3)
In this example, C
I
is 5.6 nF so one would likely choose a value in the range of 5.6 nF to 1
μ
F. A further
consideration for this capacitor is the leakage path from the input source through the input network (C
I
) and the
feedback network to the load. This leakage current creates a dc offset voltage at the input to the amplifier that
reduces useful headroom, especially in high gain applications. For this reason a low-leakage tantalum or
ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor
should face the amplifier input in most applications as the dc level there is held at V
DD
/2, which is likely higher
than the source dc level. Note that it is important to confirm the capacitor polarity in the application.
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相關代理商/技術參數 |
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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 |
| TPA0122 | 制造商:TI 制造商全稱: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 開發工具 TPA0122 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA0122PWP | 功能描述:音頻放大器 2W Stereo A 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 |
| TPA0122PWPG4 | 功能描述:音頻放大器 2W Stereo A 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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