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參數(shù)資料
| 型號： | TPA6101A2DGK |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | 50 MW ULTRALOW VOLTAGE FIXED GAIN STEREO HEADPHONE AUDIO POWER AMPLIFIER |
| 中文描述： | 50兆瓦超低電壓的固定增益，立體聲耳機(jī)音頻功率放大器 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 423K |
| 代理商： | TPA6101A2DGK |
SLOS331B AUGUST 2000 REVISED SEPTEMBER 2004
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
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 R
I
form a high-pass filter with the corner frequency
determined in equation 1. R
I
is set internally and is fixed at 80 k
.
1
2 R
I
C
I
(1)
f
c
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 the specification calls for a flat-bass response down to 20 Hz. Equation 1 is
reconfigured as equation 2.
(2)
C
I
1
2 R
I
f
c
In this example, C
I
is approximately 0.1
μ
F. A further consideration for this capacitor is the leakage path from
the input source through the input network (R
I
, C
I
) and the feedback resistor (R
F
) 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 V
DD
/4,
which is likely higher than the source dc level. It is important to confirm the capacitor polarity in the application.
power supply decoupling, C
S
The TPA6101A2 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
μ
F, placed as close as possible to the device V
DD
lead, works best. For
filtering lower-frequency noise signals, a larger, aluminum-electrolytic capacitor of 10
μ
F or greater placed near
the power amplifier is recommended.
midrail bypass capacitor, C
B
The midrail bypass capacitor (C
B
) serves several important functions. During start-up, C
B
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
1
C
I
R
I
As an example, consider a circuit where C
B
is 1
μ
F, C
I
is 0.1
μ
F, and R
I
is 80 k
. Inserting these values into the
equation 3 results in: 18.18
≤
125 which satisfies the rule. Bypass capacitor (C
B
) values of 0.47-
μ
F to 1-
μ
F
ceramic or tantalum low-ESR capacitors are recommended for the best THD and noise performance.
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| TPA6101A2DGKR | 功能描述:音頻放大器 Ultra Lo-Vltg Stereo Hdphn w/Fixed Gain 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 |
| TPA6101A2DGKRG4 | 功能描述:音頻放大器 Ultra Lo-Vltg Stereo Hdphn w/Fixed Gain 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 |
| TPA6101A2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6101A2 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 |
| TPA6101A2ZQYR | 功能描述:音頻放大器 50mW Ultra Low-Vltg St Headphone Aud 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 |
| TPA6101A2ZQYRG1 | 功能描述:音頻放大器 50mW Lo-Vltg,Stereo Headphone Audio 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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