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參數(shù)資料
| 型號： | TPA6139A2PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.025 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 467K |
| 代理商： | TPA6139A2PW |
fc
IN +
1
2p R
IN CIN
C
IN +
1
2p fc
IN RIN
or
Supply ramp
Supply
MUTE
Time for ac-coupling
capasitors to charge
SLOS700A
– JANUARY 2011 – REVISED MAY 2011
Input-Blocking Capacitors
DC input-blocking capacitors are required to be added in series with the audio signal into the input pins of the
TPA6139A2. These capacitors block the dc portion of the audio source and allow the TPA6139A2 inputs to be
properly biased to provide maximum performance. The input blocking capacitors also limit the DC gain to 1,
limiting the DC-offset voltage at the output.
These capacitors form a high-pass filter with the input resistor, RIN. The cutoff frequency is calculated using
Equation 1. For this calculation, the capacitance used is the input-blocking capacitor and the resistance is the
input resistor chosen from Table 1. Then the frequency and/or capacitance can be determined when one of the
two values is given.
(1)
For a fixed cutoff frequency of 2Hz the size of the input capacitance is shown in the table below with the
capacitors rounded up to nearest E6 values. For 20Hz cutoff simply divide the capacitor values with 10; e.g., for
1x gain, 150nF is needed.
Table 2. Input Capacitor for Different Gain and Cutoff
Gain_set
Gain
INPUT
2 Hz
GAIN
RESISTOR
(dB)
RESISTANCE
Cutoff
249k
–2.0x
6.0
37k
2.2
F
82k0
–1.0x
0.0
55k
1.5
F
49k2
–1.5x
3.5
44k
2.2
F
35k1
–2.3x
7.2
33k
3.3
F
27k3
–2.5x
8.0
31k
3.3
F
20k5
–3.0x
9.5
28k
3.3
F
15k4
–3.5x
10.9
24k
3.3
F
11k5
–4.0x
12.0
22k
4.7
F
9k09
–5.0x
14.0
18k
4.7
F
7k50
–5.6x
15.0
17k
4.7
F
6k19
–6.4x
16.1
15k
6.8
F
5k11
–8.3x
18.4
12k
6.8
F
3k90
–10x
20.0
10k
10
F
Pop-Free Power Up
Pop-free power up is ensured by keeping the MUTE low during power supply ramp up and down. The pin should
be kept low until the input AC-coupling capacitors are fully charged before asserting the MUTE pin high to
pre-charge the ac-coupling; and, pop-less power-up is achieved. Figure 10 illustrates the preferred sequence.
Figure 10. Power-Up Sequence
Copyright
2011, Texas Instruments Incorporated
11
Product Folder Link(s) :TPA6139A2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA6139A2PW | 制造商:Texas Instruments 功能描述:HEADPHONE AMPLFIER IC STEREO 32OHM 25 |
| TPA6139A2PWR | 功能描述:音頻放大器 25mW Headphone 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6139A2RGTR | 功能描述:音頻放大器 DirectPath 25mW Headphone 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6139A2RGTT | 功能描述:音頻放大器 DirectPath 25mW Headphone 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6140A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CLASS-G DIRECTPATH? STEREO HEADPHONE AMPLIFIER WITH I2C VOLUME CONTROL |
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