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參數資料
| 型號： | TPA0142PWPR |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual Audio Amplifier |
| 中文描述： | 雙音頻放大器 |
| 文件頁數： | 21/34頁 |
| 文件大小： | 488K |
| 代理商： | TPA0142PWPR |
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TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA0112 is set by two input terminals, GAIN0 and GAIN1.
Table 1. Gain Settings
GAIN0
0
0
1
1
X
GAIN1
0
1
0
1
X
SE/BTL
0
0
0
0
1
A
V
–2 V/V
–6 V/V
–12 V/V
–24 V/V
–1 V/V
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance, Z
I
, to be dependant on the gain setting. The actual gain settings are controlled
by ratios of resistors, so the actual gain distribution from part-to-part is quite good. However, the input
impedance will shift by 30% due to shifts in the actual resistance of the input impedance.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 10 k
, which is the absolute minimum input impedance of the TPA0112. At the higher gain
settings, the input impedance could increase as high as 115 k
.
input resistance
Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest
value to over 6 times that value. As a result, if a single capacitor is used in the input high pass filter, the –3 dB
or cut-off frequency will also change by over 6 times. If an additional resistor is connected from the input pin
of the amplifier to ground, as shown in the figure below, the variation of the cut-off frequency will be much
reduced.
C
R
IN
ZI
ZF
Input
Signal
The input impedance at each gain setting is given in the table below:
A
V
Z
I
–24 V/V
–12 V/V
–6 V/V
–2 V/V
14 k
26 k
45.5 k
91 k
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| TPA0142PWPRG4 | 功能描述:音頻放大器 2W Stereo APA With DC Volume Control 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 |
| TPA0152 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DIGITAL VOLUME CONTROL |
| TPA0152EVM | 功能描述:音頻 IC 開發工具 TPA0152 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 |
| TPA0152PWP | 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 |
| TPA0152PWPG4 | 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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