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參數(shù)資料
| 型號(hào)： | LMV1022URX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | AUDIO PREAMPLIFIER, PBGA6 |
| 封裝： | MICRO, SMD-6 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大小： | 623K |
| 代理商： | LMV1022URX |
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LAYOUT CONSIDERATIONS
To obtain the best possible performance from the micro-
phone, special care needs to be taken for the design of the
PCB. The V
IN trace is very sensitive as it is connected to the
high impedance electret element. It is essential to isolate and
shield the V
IN trace as much as possible from the digital signal
traces (DATA and CLOCK). This needs to be done to avoid
any switching noise coupling directly into the input of the IC.
An example of a PCB layout is given in Figure 12. The mi-
crophone PCB has two capacitors. One capacitor (100nF) is
connected to the reference pin of the LMV1022/ LMV1023.
The other capacitor (100nF) is used as decoupling for high
frequencies on the supply. No capacitors should be placed on
the data output of the LMV1022/ LMV1023 since it will only
load the output driver and would degrade the performance.
This is opposite to the regular analog phantom biased micro-
phones, where capacitors are needed to improve RFI.
20212476
FIGURE 11. Application schematic for PCB Layout
20212428
FIGURE 12. PCB Layout
DEMOBOARD
The LMV1022/LMV1023 demo board provides a means for
easy evaluation of digital PDM microphone amplifiers like the
LMV1022, LMV1023, LMV1024 and LMV1026. The demo
board has the LMV1022 and the LMV1023 in the 6 pin
μSMD
package mounted ready for evaluation. This demo board also
provides the means by using a DIP socket to evaluate parts
on DIP conversion boards and offers a four pin interface to
connect other digital PDM sources like microphones contain-
ing LMV1022 alike parts. The user guide for this demoboard
can be found as application note AN-1784
15
www.national.com
202124 Version 2 Revision 1
Print Date/Time: 2011/07/08 14:36:52
LMV1022/LMV1023
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| LMV1026UP | 1 CHANNEL, AUDIO PREAMPLIFIER, PBGA6 |
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相關(guān)代理商/技術(shù)參數(shù) |
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| LMV1024 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024_09 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024UR | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024UR/NOPB | 功能描述:IC PRE AMP MIC MONO AB ADC 6USMD RoHS:是 類(lèi)別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類(lèi)型:H 類(lèi) 輸出類(lèi)型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)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(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類(lèi)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) |
| LMV1024URX | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
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