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參數(shù)資料
| 型號(hào)： | TPA0222PWP |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | STEREO 2-W AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL |
| 中文描述： | 立體聲2 - W音頻功率放大器，具有四種可選增益設(shè)置和MUX控制 |
| 文件頁數(shù)： | 22/33頁 |
| 文件大小： | 522K |
| 代理商： | TPA0222PWP |
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TPA0222
STEREO 2-W AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
SLOS285 – NOVEMBER 1999
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
The –3 dB frequency can be calculated using equation 1:
(1)
–3 dB
1
2
C R RI
If the filter must be more accurate, the value of the capacitor should be increased while the 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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0222PWPG4 | 功能描述:音頻放大器 St 2W Aud Pwr 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 |
| TPA0222PWPR | 功能描述:音頻放大器 St 2W Aud Pwr 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 |
| TPA0222PWPRG4 | 功能描述:音頻放大器 St 2W Aud Pwr 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 |
| TPA0223 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0223DGQ | 功能描述:音頻放大器 2W Mono Aud Pwr 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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