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參數資料
| 型號： | TPA6140A2YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA16 |
| 封裝： | 1.6 X 1.6 MM, 0.4 MM PITCH, GREEN, DSBGA-16 |
| 文件頁數： | 8/30頁 |
| 文件大小： | 705K |
| 代理商： | TPA6140A2YFFT |
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+
–
VideoBuffer/Amp
(i.e.,THS7375)
TPA6140A2
75 W
OUTR
OUTL
C
L
O
1
f
2 R C
=
p
O
C
L
1
C
2 f R
=
p
SLOS598A – MARCH 2009 – REVISED OCTOBER 2009................................................................................................................................................. www.ti.com
HIGH OUTPUT IMPEDANCE
The TPA6140A2 has a HI-Z bit option that increases output impedance while muting the amplifier. Set the HiZ_L
and HiZ_R bits (register 3, bits 1 and 0) to HIGH to activate the HI-Z mode. This feature allows the headphone
output jack to be shared for other functions besides audio. For example, sharing of a headphone jack between
audio and video as shown in Figure 30. In HI-Z mode, the TPA6140A2 output impedance is high enough to
prevent video signal attenuation.
MAXIMUM EXTERNAL
OUTPUT
SUPPLY
SWS BIT
HI-Z BIT
VOLTAGE ALLOWED ON
COMMENTS
IMPEDANCE
CURRENT
OUTPUT PINS
1
0
8 k
< 3
μA
–0.3 V to 3.3 V(1)
Shutdown mode
1
8.5 k
0
≤ 1
1.2 mA
–
Active mode
8.5 k
@ 40kHz
0
1
600
@ 6 MHz
1 mA
–1.8 V to 1.8 V
HI-Z mode
400
@ 13 MHz
(1)
If AVDD is < 3.3 V, then maximum allowed external voltage applied is AVDD in this mode
Figure 30. Sharing One Connector Between Audio and Video Signals Example
HEADPHONE AMPLIFIERS
Single-supply headphone amplifiers typically require dc-blocking capacitors to remove dc bias from their output
voltage. The top drawing in Figure 31 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 6, where RL is the load impedance, CO is the dc-blocking capacitor, and fC is the cutoff frequency.
(6)
For a given high-pass cutoff frequency and load impedance, the required dc-blocking capacitor is found as:
(7)
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 μF. 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.
16
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPA6140A2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6140A2YFFT | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
| TPA6141A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CLASS-G DIRECTPATH? STEREO HEADPHONE AMPLIFIER |
| TPA6141A2YFFEVM | 功能描述:音頻 IC 開發工具 TPA6141A2YFF Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA6141A2YFFR | 功能描述:音頻放大器 25mW Class-G Direct Path St Headph 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 |
| TPA6141A2YFFT | 功能描述:音頻放大器 25mW Class-G Direct Path St Headph 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 |
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