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参数资料
| 型号： | LMV1026URX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | PDM Output with Pre-Amplifier for Electret Microphones |
| 中文描述： | 2 CHANNEL, AUDIO AMPLIFIER, PBGA6 |
| 封装： | 0.35 MM, LEAD FREE, MICRO SMD-6 |
| 文件页数： | 7/18页 |
| 文件大小： | 560K |
| 代理商： | LMV1026URX |
To eliminate the noise above the band of interest a low pass
decimation filter is implemented in the baseband chip or DSP.
The resulting frequency spectrum contains only the frequency
components left within the band of interest. Figure 8 depicts
the frequency spectrum after filtering.
20133473
FIGURE 8. Frequency Spectrum after Filtering
STEREO OPERATION
The LMV1024 and the LMV1026 are designed to operate to-
gether in a stereo solution with two microphones. One micro-
phone will have a LMV1024 built-in and the other will have a
LMV1026 built-in. These two microphones share the same
interface lines to minimize wiring (Figure 9).
20133425
FIGURE 9. Stereo Application
Both microphones produce valid data in only one half of a
clock cycle to allow the two microphones to operate on the
same I/O lines (Data and Clock). To avoid overlap between
the drivers of the microphones, one microphone always goes
into a high impedance state before the second microphone
starts driving the data-line. The LMV1024 is positive edge
triggered while the LMV1026 is negative edge triggered. The
timing between the two microphones is shown in Figure 10.
For exact timing values, please see the Electrical Character-
istics table.
20133429
FIGURE 10. Timing
LAYOUT CONSIDERATIONS
To obtain the best possible performance from the micro-
phone, special care needs to be taken for the design of the
PCB. Especially the V
IN trace is very sensitive as it is con-
nected 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
11. The microphone PCB has two capacitors. One capacitor
(100 nF) is connected to the reference pin of the LMV1024/
LMV1026. The other capacitor (10 nF) is used as decoupling
for high frequencies on the supply. No capacitors should be
placed on the data output of the LMV1024/LMV1026 since it
will only load the output driver and would degrade the perfor-
mance. This is opposite to the regular analog phantom biased
microphones, where capacitors are needed to improve RFI.
20133428
FIGURE 11. PCB Layout
15
www.national.com
201334 Version 3 Revision 4
Print Date/Time: 2009/07/20 17:12:49
LMV1024/LMV1026
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相关代理商/技术参数 |
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| LMV1026URX/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) |
| LMV102M5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LMV102M5X | 功能描述:IC AMPLIFIER FIXED-GAIN SOT23-5 RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| LMV102M7 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LMV102M7X | 功能描述:IC AMP FIXED GAIN SC-70-5 RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
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