參數(shù)資料
型號: LM4872IBPX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 音頻/視頻放大
英文描述: 1 Watt Audio Power Amplifier in micro SMD package
中文描述: 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8
封裝: MICRO, SMD-8
文件頁數(shù): 13/14頁
文件大?。?/td> 425K
代理商: LM4872IBPX
Application Information
(Continued)
REFERENCE DESIGN BOARD and PCB LAYOUT
GUIDELINES
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.
General Mixed Signal Layout Recommendation
Power and Ground Circuits
For 2 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 (bring-
ing individual traces back to a central point rather than daisy
chaining traces together in a serial manner) can have a ma-
jor impact on 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 take require
a greater amount of design time but will not increase the final
price of the board. The only extra parts required will 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. It is further recommended to put
digital and analog power traces over the corresponding digi-
tal and analog ground traces to minimize noise coupling.
Placement of Digital and Analog Components
All digital components and high-speed digital signals traces
should be located as far away as possible from analog com-
ponents and circuit traces.
Avoiding Typical Design / Layout Problems
Avoid ground loops or running digital and analog traces par-
allel 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.
DS101230-25
Figure 4
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4872ITP 制造商:Texas Instruments 功能描述:AMP AUDIO 1W BOOMER SMD 4872
LM4872ITP/NOPB 功能描述:IC AMP AUDIO PWR 1W MONO 8USMD 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,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)
LM4872ITPX/NOPB 制造商:Texas Instruments 功能描述:
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LM4873_02 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 2.1W Audio Amplifier Plus Stereo Headphone Function