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INMP621Wide Dynamic Range Microphone with PDM Digital OutputThe INMP621 is a high sound pressure level (SPL), ultra-low noise, low power, digital output, bottom ported omnidirectional MEMS microphone. This microphone clips at 133 dB SPL, which is useful for clearly capturing audio in loud environments. The INMP621 consists of a MEMS microphone element and an impedance converter amplifier followed by a fourth-order Σ-Δ modulator. The digital interface allows the pulse density modulated (PDM) output of two microphones to be time multiplexed on a single data line using a single clock. The INMP621 is pin compatible with the INMP421 and INMP521 microphones, providing an easy upgrade path. The INMP621 has a high SNR of 65 dBA and sensitivity of −46 dBFS. The INMP621 has an extended wideband frequency response, resulting in natural sound with high intelligibility. Low current consumption, and a sleep mode with less than 5.5 µA of current consumption, enable long battery life for portable applications. The INMP621 is available in a thin 4 × 3 × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation. |
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Product | Package Size | Output | Port Location | SNR (dBA) | AOP (dB SPL) | Sensitivity (dbfs) | LF Cutoff (Hz) | Status | Purchase |
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INMP621 | 4 × 3 × 1 | PDM | Bottom | 65 | 133 | -46 | 45 | NR/ND (T5838 recommended) |
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Datasheet / Product Brief | Version | Updated | Download |
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INMP621 Datasheet | 1.3 | 2019-09-04 |
App Notes & User Guides | Version | Updated | Download |
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AN-100 – MEMS Microphone Handling and Assembly Guide | 1.5 | 2017-07-12 | |
AN-1112 – Microphone Specifications Explained | 1.1 | 2016-06-15 | |
AN-1124 – Recommendations for Sealing InvenSense Bottom-Port MEMS Microphones from Dust and Liquid Ingress | 1.0 | 2014-03-21 | |
AN-1140 – Microphone Array Beamforming | 1.0 | 2013-12-31 | |
AN-1003 – Recommendations for Mounting and Connecting InvenSense MEMS Microphones | 1.0 | 2013-12-31 | |
Low Self Noise: The First Step to High-Performance MEMS Microphone Applications | 1.0 | 2013-12-31 | |
Analog and Digital MEMS Microphone Design Considerations | 1.0 | 2013-12-31 | |
Understanding Microphone Sensitivity | 1.0 | 2013-12-18 | |
AN-000111 – Selecting PDM Microphone Clock Frequencies and Decimation Ratios | 1.0 | 2017-04-03 | |
AN-0078 – High-Performance Digital MEMS Microphone Simple Interface to SigmaDSP Audio Codec | 1.0 | 2014-02-22 | |
Inter-IC Digital Audio Interfaces | 1.0 | 2013-11-31 | |
UG-118 – Bottom Port Digital MEMS Microphone Evaluation Board | 1.1 | 2014-05-01 |
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