參數(shù)資料
型號(hào)： LM4917
廠商： National Semiconductor Corporation
英文描述： Ground-Referenced, 95mW Stereo Headphone Amplifier
中文描述： 地為參考，95mW立體聲耳機(jī)放大器
文件頁(yè)數(shù)： 16/18頁(yè)
文件大?。?/td> 1208K
代理商： LM4917
Application Information
(Continued)
LM4917 REFERENCE DESIGN BOARDS
BILL OF MATERIALS
Part Description
Qty
1
1
1
2
4
1
1
Ref Designator
LM4917 Mono Reference Design Board
LM4917 Audio AMP
Tantalum Cap 1μF 16V 10
Ceramic Cap 0.39μF 50V Z50 20
Resistor 20k
1/10W 5
Resistor 100k
1/10W 5
Jumper Header Vertical Mount 2X1, 0.100
U1
Cs
Ci
Ri, Rf
Rpu
J1
PCB LAYOUT GUIDELINES
This section provides practical guidelines for mixed signal
PCB layout that involves various digital/analog power and
ground traces. Designers should note that these are only
"rule-of-thumb" recommendations and the actual results will
depend heavily on the final layout.
Minimization of THD
PCB trace impedance on the power, ground, and all output
traces should be minimized to achieve optimal THD perfor-
mance. Therefore, use PCB traces that are as wide as
possible for these connections. As the gain of the amplifier is
increased, the trace impedance will have an ever increasing
adverse affect on THD performance. At unity-gain (0dB) the
parasitic trace impedance effect on THD performance is
reduced but still a negative factor in the THD performance of
the LM4917 in a given application.
GENERAL MIXED SIGNAL LAYOUT
RECOMMENDATION
Power and Ground Circuits
For two layer mixed signal design, it is important to isolate
the digital power and ground trace paths from the analog
power and ground trace paths. Star trace routing techniques
(bringing individual traces back to a central point rather than
daisy chaining traces together in a serial manner) can
greatly enhance low level signal performance. Star trace
routing refers to using individual traces to feed power and
ground to each circuit or even device. This technique will
require a greater amount of design time, but will not increase
the final price of the board. The only extra parts required may
be some jumpers.
Single-Point Power / Ground Connections
The analog power traces should be connected to the digital
traces through a single point (link). A "PI-filter" can be helpful
in minimizing high frequency noise coupling between the
analog and digital sections. Further, place digital and analog
power traces over the corresponding digital and analog
ground traces to minimize noise coupling.
Placement of Digital and Analog Components
All digital components and high-speed digital signal traces
should be located as far away as possible from analog
components and circuit traces.
Avoiding Typical Design / Layout Problems
Avoid ground loops or running digital and analog traces
parallel to each other (side-by-side) on the same PCB layer.
When traces must cross over each other do it at 90 degrees.
Running digital and analog traces at 90 degrees to each
other from the top to the bottom side as much as possible will
minimize capacitive noise coupling and cross talk.
L
www.national.com
16
相關(guān)PDF資料
PDF描述
LM4917MT Ground-Referenced, 95mW Stereo Headphone Amplifier
LM4917SD Ground-Referenced, 95mW Stereo Headphone Amplifier
LM4918 Stereo Audio Amp with AGC Control
LM4918LQ Stereo Audio Amp with AGC Control
LM4924 2 Cell Battery, 40mW Per Channel Output Capacitor-Less(OCL) Stereo Headphone Audio Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4917MT 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
LM4917MT/NOPB 功能描述:音頻放大器 95mW St Headphone Amp 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
LM4917MTBD 功能描述:BOARD EVALUATION LM4917MT RoHS:否 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 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(biāo)準(zhǔn)包裝:1 系列:-
LM4917MTX 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
LM4917MTX/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
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