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ADMP441ACEZ-RL bảng dữ liệu(PDF) 11 Page - Analog Devices |
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ADMP441ACEZ-RL bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 16 page Data Sheet ADMP441 Rev. A | Page 11 of 16 APPLICATIONS INFORMATION POWER SUPPLY DECOUPLING For best performance and to avoid potential parasitic artifacts, placing a 0.1 μF ceramic type X7R or better capacitor between Pin 7 (VDD) and ground is strongly recommended. The capacitor should be placed as close to Pin 7 as possible. The connections to each side of the capacitor should be as short as possible, and the trace should stay on a single layer with no vias. For maximum effectiveness, locate the capacitor equidistant from the power and ground pins or, when equidistant placement is not possible, slightly closer to the power pin. Thermal connec- tions to the ground planes should be made on the far side of the capacitor, as shown in Figure 14. VDD GND TO GND TO VDD CAPACITOR Figure 14. Recommended Power Supply Bypass Capacitor Layout HANDLING INSTRUCTIONS Pick-and-Place Equipment The MEMS microphone can be handled using standard pick- and-place and chip shooting equipment. Care should be taken to avoid damage to the MEMS microphone structure as follows: • Use a standard pickup tool to handle the microphone. Because the microphone hole is on the bottom of the package, the pickup tool can make contact with any part of the lid surface. • Use care during pick-and-place to ensure that no high shock events above 10,000 g are experienced because such events may cause damage to the microphone. • Do not pick up the microphone with a vacuum tool that makes contact with the bottom side of the microphone. Do not pull air out of or blow air into the microphone port. • Do not use excessive force to place the microphone on the PCB. Reflow Solder For best results, the soldering profile should be in accordance with the recommendations of the manufacturer of the solder paste used to attach the MEMS microphone to the PCB. It is recommended that the solder reflow profile does not exceed the limit conditions specified in Figure 4 and Table 5. Board Wash When washing the PCB, ensure that water does not make contact with the microphone port. Blow-off procedures and ultrasonic cleaning must not be used. SUPPORTING DOCUMENTATION Evaluation Board User Guide UG-303, EVAL-ADMP441Z-FLEX: Bottom-Port I2S Output MEMS Microphone Evaluation Board Circuit Note CN-0208, High Performance Digital MEMS Microphone's Simple Interface to SigmaDSP Audio Processor with I2S Output Application Notes AN-1112 Application Note, Microphone Specifications and Terms Explained AN-1003 Application Note, Recommendations for Mounting and Connecting Analog Devices, Inc., Bottom-Ported MEMS Microphones AN-1068 Application Note, Reflow Soldering of the MEMS Microphone AN-1124 Application Note, Recommendations for Sealing Analog Devices, Inc., Bottom-Port MEMS Microphones from Dust and Liquid Ingress For additional information, visit www.analog.com/mic. |
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