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參數(shù)資料
| 型號： | LM4854 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | 1.9W Monaural, 85mW Stereo Headphone Audio Amplifier |
| 中文描述： | 1.9W單聲道，85mW立體聲耳機音頻放大器 |
| 文件頁數(shù)： | 18/29頁 |
| 文件大小： | 1440K |
| 代理商： | LM4854 |
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Typical Performance Characteristics
(Continued)
Channel-to-Channel Crosstalk
vs Frequency
Channel-to-Channel Crosstalk
vs Frequency
200382D4
V
= 5V, R
= 16
(SE)
A = Left channel driven, right channel measured
B = Right channel driven, left channel measured
200382D5
V
= 5V, R
= 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
= 3V, R
= 16
(SE)
A = Left channel driven, right channel measured
B = Right channel driven, left channel measured
200382D7
V
= 3V, R
= 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
/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
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4854A E WAF | 制造商:Texas Instruments 功能描述: |
| LM4854IBL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.9W Monaural, 85mW Stereo Headphone Audio Amplifier |
| LM4854IBL/NOPB | 功能描述:IC AMP AUDIO PWR 2.3W AB 12USMD RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4854LD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AUDIO AMPLIFIER|DUAL|LLCC|14PIN|CERAMIC |
| LM4854LD/NOPB | 功能描述:IC AMP AUDIO PWR 2.3W MONO 14LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
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