- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄30760 > LMV1022UR (NATIONAL SEMICONDUCTOR CORP) AUDIO PREAMPLIFIER, PBGA6 PDF資料下載
參數(shù)資料
| 型號(hào)： | LMV1022UR |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO PREAMPLIFIER, PBGA6 |
| 封裝： | MICRO, SMD-6 |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 623K |
| 代理商： | LMV1022UR |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)當(dāng)前第18頁(yè)
Application Section
The LMV1022 and LMV1023 consist of a pre-amplifier and
sigma-delta converter for placement inside an electret con-
denser microphone (ECM). The output of the LMV1022/
LMV1023 is a robust digital serial bit stream eliminating the
sensitive low-level analog signals of conventional JFET mi-
crophones. This application section describes, among others,
a typical application, a sensitivity comparison between differ-
ent ECM types, stereo operation and layout recommenda-
tions on the ECM PCBs.
TYPICAL APPLICATION
Figure 1 depicts a typical application, where the LMV1022 or
LMV1023 is built inside the ECM canister. This ECM can be
directly connected to a DSP in a digital audio system, like a
baseband chip in a cell phone. Connecting is easy because
of the digital LMV1022/ LMV1023 interface. A digital filter in
the DSP or Baseband decimates the audio signal.
20212424
FIGURE 1. Typical Application
LOW FREQUENCY CUT OFF FILTER
To reduce noise on the output of the microphone a low fre-
quency cut off filter has been implemented. This filter reduces
the effect of wind and handling noise. It's also helpful to re-
duce the proximity effect in directional microphones. This
effect occurs when the sound source is very close to the mi-
crophone. The air pressure wave results in very low frequen-
cy, large amplitude signals that when amplified gives a 'plop'
sound. This large signal can cause a temporary overload in
the amplifier, which results in distortion of the signal The cor-
ner frequency of the integrated high pass filter is linear pro-
portional to the input clock frequency of the part.
BUILT-IN PRE-AMPLIFIER / ADC
The LMV1022/ LMV1023 are offered in a space saving small
6-bump micro SMD package in order to fit inside small ECM
canisters. The LMV1022 or LMV1023 IC is placed on the
PCB. This PCB forms the bottom of the microphone, which is
placed in the device.
20212443
FIGURE 2. Built-in Pre-Amplifier / ADC
Figure 3 depicts a cross section of a microphone with the IC
inside the ECM canister. The PCB of the microphone has 4
pads that connects V
DD, Ground, DATA and the CLOCK.
9
www.national.com
202124 Version 2 Revision 1
Print Date/Time: 2011/07/08 14:36:52
LMV1022/LMV1023
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMV1023URX | AUDIO PREAMPLIFIER, PBGA6 |
| LMV1023UR | AUDIO PREAMPLIFIER, PBGA6 |
| LMV1022URX | AUDIO PREAMPLIFIER, PBGA6 |
| LMV1024UPX | 1 CHANNEL, AUDIO PREAMPLIFIER, PBGA6 |
| LMV1024UP | 1 CHANNEL, AUDIO PREAMPLIFIER, PBGA6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV1024 | 制造商:NSC 制造商全稱: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:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024UR | 制造商:NSC 制造商全稱: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® 類型:H 類 輸出類型: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:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。