MEMS "TItle="MEMS" MEMS" TItle="MEMS" MEMS microphones, including MEMS sensors, signal conditioning, ADC, anti-aliasing filters, power management and industry standard 24-bit I2S interface, and directly connected to the digital Processors such as DSP and MCU.SNR of 61 BA, sensitivity of −26 dBFS, flat frequency response from 60 Hz to 15 kHz, are mainly used in teleconferencing, game consoles, mobile devices, laptops, tablets and security systems. This article describes the main features of the ADMP4411, block diagram, system block diagram and evaluation board sub-board EVAL-ADMP441Z circuit diagram, bill of materials.
The ADMP441 is a high performance, low power, digital output, omnidirecTIonal MEMS microphone with a bottom port. The complete ADMP441 soluTIon consists of a MEMS sensor, signal conditioning, an analog-to-digital converter, antialiasing filters, power management, and an Industry standard 24-bit I2S interface. The I2S interface allows the ADMP441 to connect directly to digital processors, such as DSPs and microcontrollers, with-out the need for an audio codec in the system.
The ADMP441 has a high SNR and high sensitivity, making it an excellent choice for far field applications. The ADMP441 has a flat wideband frequency response, resulting in natural sound with high intelligibility. A built-in particle filter provides high reliability.
The ADMP441 is available in a thin 4.72 mm × 3.76 mm × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation. The ADMP441 is halide free.
Main features of ADMP4411:
Digital I2S interface with high precision 24-bit data
High SNR of 61 dBA
High sensitivity of −26 dBFS
Flat frequency response from 60 Hz to 15 kHz
Low current consumption of 1.4 mA
High PSR of −75 dBFS
Small 4.72 mm × 3.76 mm × 1 mm surface-mount package
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
ADMP4411 application:
Teleconferencing systems
Gaming consoles
Mobile devices
Laptops
Tablets
Security systems
Figure 1. Functional Block Diagram of the ADMP4411
Figure 2. Block diagram of the ADMP4411 system
Evaluation board sub-board EVAL-ADMP441Z
EVAL-ADMP441Z SDP Daughter Board for the ADMP441 I2S MEMS Microphone
The EVAL-ADMP441Z is an evaluation board that works with the EVAL-ADMP441Z-FLEX and the system demonstration platform (SDP) to allow quick evaluation of the performance of the ADMP441 MEMS microphone. This evaluation system can be used to stream two channels of audio From two ADMP441 microphones to a PC over a USB connection. The system identifies itself to a PC as a standard USB audio interface; therefore, no additional drivers or software are required to run the system. One EVAL-ADMP441Z-FLEX board is included in The evaluation kit. The SDP-B controller board is purchased separately. The EVAL-ADMP441Z board also provides hardware control and probe/test points to examine the digital signals of the ADMP441.
The evaluation kit includes:
EVAL-ADMP441Z daughter board
EVAL-ADMP441Z-FLEX board
5 V power supply
Figure 3. EVAL-ADMP441Z outline drawing of the evaluation board
Figure 4. Evaluation board board EVAL-ADMP441Z circuit diagram
Evaluation Board Board EVAL-ADMP441Z Material List:
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