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参数资料
| 型号： | LMV1023URX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | AUDIO PREAMPLIFIER, PBGA6 |
| 封装： | MICRO, SMD-6 |
| 文件页数： | 18/18页 |
| 文件大小： | 623K |
| 代理商： | LMV1023URX |
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
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| LMV1023UR | AUDIO PREAMPLIFIER, PBGA6 |
| LMV1022URX | AUDIO PREAMPLIFIER, PBGA6 |
| LMV1024UPX | 1 CHANNEL, AUDIO PREAMPLIFIER, PBGA6 |
| LMV1024UP | 1 CHANNEL, AUDIO PREAMPLIFIER, PBGA6 |
| LMV1026UPX | 1 CHANNEL, AUDIO PREAMPLIFIER, PBGA6 |
相关代理商/技术参数 |
参数描述 |
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| LMV1024 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024_09 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024UR | 制造商:NSC 制造商全称: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 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LMV1024URX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
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