參數(shù)資料
型號(hào)： LM4890
廠商： National Semiconductor Corporation
英文描述： 1 Watt Audio Power Amplifier
中文描述： 1瓦音頻功率放大器
文件頁(yè)數(shù)： 25/31頁(yè)
文件大?。?/td> 1208K
代理商： LM4890
Application Information
(Continued)
Mono LM4890 Reference Design Boards
Bill of Material for all 3 Demo Boards
Item
1
10
20
21
25
30
35
Part Number
551011208-001 LM4890 Mono Reference Design Board
482911183-001 LM4890 Audio AMP
151911207-001 Tant Cap 1uF 16V 10
151911207-002 Cer Cap 0.39uF 50V Z5U 20% 1210
152911207-001 Tant Cap 1uF 16V 10
472911207-001 Res 20K Ohm 1/10W 5
210007039-002 Jumper Header Vertical Mount 2X1 0.100
Part Description
Qty
1
1
1
1
1
3
2
Ref Designator
U1
C1
C2
C3
R1, R2, R3
J1, J2
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
RECOMMENDATIONS
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
major 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
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
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
25
相關(guān)PDF資料
PDF描述
LM4893 1.1 Watt Audio Power Amplifier
LM4893ITL 1.1 Watt Audio Power Amplifier
LM4893ITLX 1.1 Watt Audio Power Amplifier
LM4893MA 1.1 Watt Audio Power Amplifier
LM4893MM 1.1 Watt Audio Power Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM48901 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Audio Power Amplifier Series
LM48901RL 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Audio Power Amplifier Series
LM48901RL/NOPB 功能描述:音頻放大器 Quad Class D Spatial Array RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
LM48901RLX 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Audio Power Amplifier Series
LM48901RLX/NOPB 功能描述:音頻放大器 Quad Class D Spatial Array RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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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