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參數資料
| 型號： | TPA6102A2D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.05 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 5/21頁 |
| 文件大小： | 588K |
| 代理商： | TPA6102A2D |
TPA6102A2
50mW ULTRALOW VOLTAGE, FIXEDGAIN STEREO HEADPHONE
AUDIO POWER AMPLIFIER
SLOS324B JUNE 2000 REVISED SEPTEMBER 2004
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor, CI
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 RI form a high-pass filter with the corner frequency
determined in equation 1. RI is set internally and is fixed at 20 k.
(1)
fc +
1
2
pR
I
C
I
The value of CI is important to consider, as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where the specification calls for a flat bass response down to 20 Hz. Equation 1 is
reconfigured as equation 2.
(2)
C
I +
1
2
pR
I fc
In this example, CI is 0.40 F, so one would likely choose a value in the range of 0.47 F to 1 F. A further
consideration for this capacitor is the leakage path from the input source through the input network (RI, CI) and
the feedback resistor (RF) to the load. This leakage current creates a dc offset voltage at the input to the amplifier
that reduces useful headroom. 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/4, which is likely higher than the source dc level. It is important
to confirm the capacitor polarity in the application.
power supply decoupling, CS
The TPA6102A2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling
to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also
prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that target different types of noise on the power supply leads.
For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance
(ESR) ceramic capacitor, typically 0.1
F, placed as close as possible to the device VDD lead, works best. For
filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10
F or greater placed near
the power amplifier is recommended.
midrail bypass capacitor, CB
The midrail bypass capacitor (CB) serves several important functions. During start-up, CB determines the rate
at which the amplifier starts up. This helps to push the start-up pop noise into the subaudible range (so low it
can not be heard). The second function is to reduce noise produced by the power supply caused by coupling
into the output drive signal. This noise is from the midrail generation circuit internal to the amplifier. The capacitor
is fed from a 55-k
source inside the amplifier. To keep the start-up pop as low as possible, the relationship
shown in equation 3 should be maintained.
(3)
1
C
B
55 k
v
1
C
I RI
As an example, consider a circuit where CB is 1 F, CI is 1 F, and RI is 20 k. Inserting these values into the
equation 3 results in: 18.18
≤ 50 which satisfies the rule. Bypass capacitor (CB) with values of 0.47-F to 1-F
ceramic or tantalum low-ESR capacitors are recommended for the best THD and noise performance.
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| TPA6102A2DG4 | 功能描述:音頻放大器 50mW Ultra Low-Vltg St Headphone Aud Amp 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 |
| TPA6102A2DGK | 功能描述:音頻放大器 Ultra Lo-Vltg Ster Hdphn w/Fixed Gain 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 |
| TPA6102A2DGKG4 | 功能描述:音頻放大器 50mW Ultra Low-Vltg St Headphone Aud Amp 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 |
| TPA6102A2DGKR | 功能描述:音頻放大器 Ultra Lo-Vltg Ster Hdphn w/Fixed Gain 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 |
| TPA6102A2DGKRG4 | 功能描述:音頻放大器 Ultra Lo-Vltg Ster Hdphn w/Fixed Gain 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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