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參數(shù)資料
| 型號： | LM4981 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | CHOKE, COM/ASYM MODE 2X0.7MH 4A |
| 中文描述： | 地為參考，80mW立體聲耳機放大器，具有數(shù)字音量控制 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大?。?/td> | 1193K |
| 代理商： | LM4981 |
LM4981
Ground-Referenced, 80mW Stereo Headphone Amplifier
with Digital Volume Control
General Description
The
LM4981
is
a
stereo,
ground-referenced,
output
capacitor-less headphone amplifier capable of delivering
83mW of continuous average power into a 16
load with
less than 1% THD+N while operating from a single 3V
supply.
The LM4981 features a new circuit technology that utilizes a
charge pump to generate a negative reference voltage. This
allows the outputs to be biased about ground, thereby elimi-
nating output-coupling capacitors typically used with normal
single-ended loads.
The LM4981 provides high quality audio reproduction with
minimal external components. A ground referenced output
eliminates the output coupling capacitors typically required
to drive single-ended loads such as headphones. The
ground reference architecture reduces components count,
cost and board space consumption, making the LM4981
ideal for handheld MP3 players, mobile phones and other
portable equipment where board space is at a premium.
Eliminating the output capacitors also improves low fre-
quency response.
The LM4981 operates from a single 2.0V – 4.2V supply, and
features a 2-wire, up/down volume control that sets the gain
of the amplifier between -33dB to +12dB in 16 discrete
steps. Selectable (active high/low) low power shutdown
mode provides flexible shutdown control. Superior click and
pop
suppression
eliminates
audible
transients
during
start-up and shutdown.
The LM4981 features an Automatic Standby Mode circuitry
(patent pending). In the absence of an input signal, after
approximately 12 seconds, the LM4981 goes into low cur-
rent standby mode. The LM4981 recovers into full power
operating mode immediately after a signal is applied to either
the left or right input pins. This feature saves power supply
current in battery operated applications.
Key Specifications
j
Improved PSRR at 217Hz
j
THD+N at 1kHz, 50mW
into 32
SE (3V)
j
Single Supply Operation (V
DD
)
j
Power Output at VDD = 3V,
RL = 16
, THD
≤
1%
j
Shutdown Current
67dB (typ)
1.0% (typ)
2.0 to 4.2V
83mW (typ)
0.01μA (typ)
Features
n
Ground Referenced Outputs
n
No Output Coupling Capacitors
n
16-Step Volume Control
n
Auto-Standby Mode
n
High PSRR
n
Available in Space Saving LLP package
n
Low Power Shutdown Mode
n
Improved Click and Pop Suppression Eliminates Noises
During Turn-on and Turn-off Transients
n
2.0V to 4.2V Operation
n
83mW Per Channel Into 16
n
Selectable Shutdown Controls (Active High/Low)
Applications
n
Portable MP3 Players
n
Mobile Phones
n
PDAs
Boomer
is a registered trademark of National Semiconductor Corporation.
November 2005
L
2005 National Semiconductor Corporation
DS201473
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4981SQ | Ground-Referenced, 80mW Stereo Headphone Amplifier with Digital Volume Control |
| LM5005 | High Voltage 2.5 Amp Buck Regulator |
| LM5005MH | High Voltage 2.5 Amp Buck Regulator |
| LM5005MHX | High Voltage 2.5 Amp Buck Regulator |
| LM5007 | High Voltage (80V) Step Down Switching Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM49810 | 制造商:NAIS 制造商全稱:Nais(Matsushita Electric Works) 功能描述:200V Audio Power Amplifier Driver with Baker Clamp |
| LM4981A WAF | 制造商:Texas Instruments 功能描述: |
| LM4981SQ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ground-Referenced, 80mW Stereo Headphone Amplifier with Digital Volume Control |
| LM4981SQ/NOPB | 功能描述:IC AMP AUDIO .083W STER AB 16LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)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(fēng)，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4981SQX/NOPB | 功能描述:IC AMP AUDIO .083W STER AB 16LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)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(fēng)，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
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