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參數資料
| 型號： | TPA4860D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數： | 13/27頁 |
| 文件大小： | 632K |
| 代理商： | TPA4860D |
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HEADPHONE SENSE CIRCUITRY, Rpu
Bias
Control
2
3
7
6
HP-IN1
HP-IN2
HP-SENSE
SHUTDOWN
VDD
RPU
Headphone
Plug
NC
TPA4860
SLOS164B – SEPTEMBER 1996 – REVISED JUNE 2004
Table 2. Common Load Impedances vs Low Frequency
Output Characteristics in SE Mode
RL
CC
LOWEST FREQUENCY
8
68 F
293 Hz
32
68 F
73 Hz
47,000
68 F
0.05 Hz
As Table 2 indicates, most of the bass response is attenuated into 8-
loads while headphone response is
adequate and drive into line level inputs (a home stereo for example) is good.
The TPA4860 is commonly used in systems where there is an internal speaker and a jack for driving external
loads (i.e., headphones). In these applications, it is usually desirable to mute the internal speaker(s) when the
external load is in use. The headphone inputs (HP-1, HP-2) and headphone output (HP-SENSE) of the TPA4860
were specifically designed for this purpose. Many standard headphone jacks are available with an internal
single-pole single-throw (SPST) switch that makes or breaks a circuit when the headphone plug is inserted.
Asserting either or both HP-1 and/or HP-2 high mutes the output stage of the amplifier and causes HP-SENSE to
go high. In battery-powered applications where power conservation is critical, HP-SENSE can be connected to
the shutdown input as shown in Figure 39. This places the amplifier in a low current state for maximum power
savings. Pullup resistors in the range from 1 k
to 10 k are recommended for 5-V and 3.3-V operation.
Figure 39. Schematic Diagram of Typical Headphone Sense Application
Table 3 details the logic for the mute function of the TPA4860.
Table 3. Truth Table for Headphone Sense and Shutdown Functions
INPUTS(1)
OUTPUT
AMPLIFIER STATE
HP-1
HP-2
SHUTDOWN
HP-SENSE
Low
Active
Low
High
Low
High
Mute
High
Low
High
Mute
High
Low
High
Mute
X(2)
High
X(2)
Shutdown
(1)
Inputs should never be left unconnected.
(2)
X = do not care
20
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相關代理商/技術參數 |
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| TPA4860DG4 | 功能描述:音頻放大器 1W Mono Aud Pwr 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 |
| TPA4860DR | 功能描述:音頻放大器 1-W Mono Audio Power Amplifier 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 |
| TPA4860DRG4 | 功能描述:音頻放大器 1-W Mono Audio Power Amplifier 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 |
| TPA4860EVM | 功能描述:音頻 IC 開發工具 TPA4860 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 |
| TPA4861 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
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