- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98274 > TPA6021A4N (TEXAS INSTRUMENTS INC) 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDIP20 PDF資料下載
參數(shù)資料
| 型號： | TPA6021A4N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDIP20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS001-AD, DIP-20 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大小： | 1823K |
| 代理商： | TPA6021A4N |
www.ti.com
INPUT RESISTANCE
C
IN
Ri
Rf
Input Signal
*3 dB
+
1
2p CR
i
(1)
INPUT CAPACITOR, C
I
f
c(highpass) +
1
2 p R
i
C
i
3 dB
fc
(2)
C
i +
1
2 p R
i
fc
(3)
TPA6021A4
SLOS465 – JUNE 2005
Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest
value to over six times that value. As a result, if a single capacitor is used in the input high-pass filter, the –3 dB
or cutoff frequency also changes by over six times.
Figure 25. Resistor on Input for Cut-Off Frequency
The input resistance at each gain setting is given in Figure 18.
The –3-dB frequency can be calculated using Equation 1.
In the typical application an input capacitor (CI) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and the input impedance of the amplifier (RI) form a
high-pass filter with the corner frequency determined in Equation 2.
The value of CI is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where RI is 70 k and the specification calls for a flat-bass response down to 40 Hz.
Equation 2 is reconfigured as Equation 3.
In this example, CI is 56.8 nF, so one would likely choose a value in the range of 56 nF to 1 F. A further
consideration for this capacitor is the leakage path from the input source through the input network (CI) 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 VDD/2, which is likely higher
than the source dc level. Note that it is important to confirm the capacitor polarity in the application.
16
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPA6021A4NE4 | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDIP20 |
| TPA6030A4PWPR | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| TPA6030A4PWP | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| TPA6030A4PWPRG4 | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| TPA6030A4PWPG4 | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA6021A4N | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC 制造商:Texas Instruments 功能描述:IC, AUDIO POWER AMP, CLASS AB, 2W, DIP20 |
| TPA6021A4NE4 | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive 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 |
| TPA6030A4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3-W Stereo Audio Power Amplifier with Advanced DC Volume Control |
| TPA6030A4_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-2 STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL |
| TPA6030A4EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6030A4 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。