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LMV1024UR Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMV1024UR Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 17 page Application Section The LMV1024/LMV1026 consist of a pre-amplifier and sigma delta converter for placement inside an electret condenser microphone (ECM). The output of the LMV1024/LMV1026 is a robust digital serial bit stream eliminating the sensitive low-level analog signals of conventional JFET microphones. This application section describes, among others, a typical application, a sensitivity comparison between different ECM types, stereo operation and layout recommendations on the ECM PCBs. TYPICAL APPLICATION Figure 1 depicts a typical application, where the LMV1024 or LMV1026 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 LMV1024/LMV1026 interface. A digital filter in the DSP or Baseband decimates the audio signal. BUILT-IN PRE-AMPLIFIER / ADC The LMV1024/LMV1026 are offered in a space saving small 6-bump micro SMD package in order to fit inside small ECM canisters. The LMV1024 or LMV1026 IC is placed on the PCB. This PCB forms the bottom of the microphone, which is placed in the cell phone. 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. 20133424 FIGURE 1. Typical Application 20133443 FIGURE 2. Built-in Pre-Amplifier / ADC 20133474 FIGURE 3. Cross section of a Microphone www.national.com 11 |
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