參數(shù)資料
型號(hào)： TPA6135A2RTER
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： 0.025 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC16
封裝： 3 X 3 MM, PLASTIC, QFN-16
文件頁(yè)數(shù)： 5/23頁(yè)
文件大小： 948K
代理商： TPA6135A2RTER
HEADPHONE AMPLIFIERS
f
=
c
1
2 R C
p
L
O
(1)
O
C
L
1
C
=
2
R
p
(2)
www.ti.com .................................................................................................................................................. SLOS623A – FEBRUARY 2009 – REVISED APRIL 2009
Single-supply headphone amplifiers typically require dc-blocking capacitors to remove dc bias from their output
voltage. The top drawing in Figure 27 illustrates this connection. If dc bias is not removed, large dc current will
flow through the headphones which wastes power, clips the output signal, and potentially damages the
headphones.
These dc-blocking capacitors are often large in value and size. Headphone speakers have a typical resistance
between 16
and 32 . This combination creates a high-pass filter with a cutoff frequency as shown in
Equation 1, where RL is the load impedance, CO is the dc-block capacitor, and fC is the cutoff frequency.
For a given high-pass cutoff frequency and load impedance, the required dc-blocking capacitor is found as:
Reducing fC improves low frequency fidelity and requires a larger dc-blocking capacitor. To achieve a 20 Hz
cutoff with 16
headphones, CO must be at least 500 F. Large capacitor values require large packages,
consuming PCB area, increasing height, and increasing cost of assembly. During start-up or shutdown the
dc-blocking capacitor has to be charged or discharged. This causes an audible pop on start-up and power-down.
Large dc-blocking capacitors also reduce audio output signal fidelity.
Two different headphone amplifier architectures are available to eliminate the need for dc-blocking capacitors.
The Capless amplifier architecture provides a reference voltage to the headphone connector shield pin as shown
in the middle drawing of Figure 27. The audio output signals are centered around this reference voltage, which is
typically half of the supply voltage to allow symmetrical output voltage swing.
When using a Capless amplifier do not connect the headphone jack shield to any ground reference or large
currents will result. This makes Capless amplifiers ineffective for plugging non-headphone accessories into the
headphone connector. Capless amplifiers are useful only with floating GND headphones.
Copyright 2009, Texas Instruments Incorporated
13
Product Folder Link(s) :TPA6135A2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA6135A2RTET 功能描述:音頻放大器 25mW DirectPath St Headphone Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TPA6135A2RTET 制造商:Texas Instruments 功能描述:Audio Power Amplifiers TI
TPA6136A2 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:25-mW DIRECTPATH STEREO HEADPHONE AMPLIFIER WITH POP SUPPRESSION
TPA6136A2YFFEVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA6136A2YFF Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TPA6136A2YFFR 功能描述:音頻放大器 25mW DirectPath St Headphone Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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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