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參數(shù)資料
| 型號： | LM4854MTX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數(shù)： | 10/29頁 |
| 文件大?。?/td> | 1440K |
| 代理商： | LM4854MTX/NOPB |
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Typical Performance Characteristics (Continued)
Channel-to-Channel Crosstalk
vs Frequency
Channel-to-Channel Crosstalk
vs Frequency
200382D4
V
DD = 5V, RL =16
(SE)
A = Left channel driven, right channel measured
B = Right channel driven, left channel measured
200382D5
V
DD = 5V, RL =32
(SE)
A = Left channel driven, right channel measured
B = Right channel driven, left channel measured
Channel-to-Channel Crosstalk
vs Frequency
Channel-to-Channel Crosstalk
vs Frequency
200382D6
V
DD = 3V, RL =16
(SE)
A = Left channel driven, right channel measured
B = Right channel driven, left channel measured
200382D7
V
DD = 3V, RL =32
(SE)
A = Left channel driven, right channel measured
B = Right channel driven, left channel measured
Application Information
ELIMINATING OUTPUT COUPLING CAPACITORS
Typical single-supply audio amplifiers that can switch be-
tween driving bridge-tied-load (BTL) speakers and single-
ended (SE) headphones use a coupling capacitor on each
SE output. This capacitor blocks the half-supply voltage to
which the output amplifiers are typically biased and couples
the audio signal to the headphones. The signal returns to
circuit ground through the headphone jack’s sleeve.
The LM4854 eliminates these coupling capacitors. When the
LM4854 is configured to drive SE loads, AMP2 is internally
configured to apply V
DD/2 to a stereo headphone jack’s
sleeve. This voltage equals the quiescent voltage present on
the Amp1 and Amp3 outputs that drive the headphones.
Headphones driven by the LM4854 operate in a manner very
similar to a BTL load. The same DC voltage is applied to
each input terminal on a headphone speaker. This results in
no net DC current flow through the speaker. AC current flows
through a headphone speaker as an audio signal’s output
amplitude increases on one of the speaker’s terminal.
When operating as a headphone amplifier, the headphone
jack sleeve is not connected to circuit ground, but to V
DD/2.
Using the headphone output jack as a line-level output will
place the LM4854’s one-half supply voltage on a plug’s
sleeve connection. Driving a portable notebook computer or
audio-visual display equipment is possible. This presents no
difficulty when the external equipment uses capacitively
coupled inputs. For the very small minority of equipment that
is DC-coupled, the LM4854 monitors the current supplied by
LM4854
www.national.com
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| LM4856LQ/NOPB | 1.5 W, 3 CHANNEL, AUDIO AMPLIFIER, QCC24 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4855 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Boomer AUDIO POWER AMPLIFIER Integrated Audio Amplifier System |
| LM48555 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ceramic Speaker Driver |
| LM48555TL | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 12-Pin uSMD T/R 制造商:Texas Instruments 功能描述:IC AMP POWER AUDIO SMD |
| LM48555TL/NOPB | 功能描述:音頻放大器 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 |
| LM48555TLBD | 功能描述:音頻 IC 開發(fā)工具 LM48555TL EVAL BOARD 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 |
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