ADMP421
iMEMS® Microphone Omni Directional Microphone with Bottom Port and Digital Output
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Please visit the InvenSense ADMP421 product page for all technical support and sales information.
The ADMP421 is a low cost, low power, digital output bottom ported omni-directional MEMS microphone. The ADM421 consists of a MEMS microphone element, an output amplifier and a 4th order sigma delta modulator. The digital interface allows for the PDM (Pulse Density Modulated) output of two microphones to be time multiplexed on a single data line using a single clock.
The ADMP421 has a high SNR and a high sensitivity making it an excellent choice for far field applications. The ADMP421 has a flat wideband frequency response resulting in natural soundwith high intelligibility. Low current consumption and a sleep mode enable long battery life for portable applications. The ADMP421 complies with the TIA-920 Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones standard.
The ADMP421 will be available in a very thin 3 mm × 4 mm × 1 mm surface mount package. It is reflow solder compatible with no sensitivity degradation. It is halide-free.
Applications
- Smartphones and features phones
- Digital video cameras
- Bluetooth Headsets
- Video Phones
- Teleconferencing systems
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ADMP421
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Software & Part Ecosystem
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Audio CODECs3 |
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PRODUCTION |
Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL |
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Obsolete |
Low Power Codec with Speaker and Headphone Amplifier |
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Obsolete |
Low-noise Stereo Codec with Enhanced Recording and Playback Processing |
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SigmaDSP Audio Processors2 |
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PRODUCTION |
SigmaDSP Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL |
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SigmaDSP Low-noise Stereo Audio Codec for Portable Applications |
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Evaluation Kits 3
EVAL-ADMP421Z
ADMP421Z Evaluation Board
Product Detail
Please visit the InvenSense ADMP421 product page for all technical support and sales information.
This PCB includes the ADMP421 and a bypass capacitor mounted on a rigid PCB. The 12-pin header connects all microphone signals directly to a codec evaluation board such as the EVAL-ADAU1761Z or EVAL-ADAU1361Z, or to a custom evaluation system.
EVAL-ADMP421Z-FLEX
ADMP421 FLEX Evaluation Board
Product Detail
Please visit the InvenSense ADMP421 product page for all technical support and sales information.
This flex PCB includes just the ADMP421 and a bypass capacitor. The five wires allow an easy connection to the microphone’s PDM output data, clock, left/right select, VDD, and ground into your evaluation system. Two EVAL-ADMP421Z-FLEX boards can share common data, clock, VDD, and ground signals to multiplex both microphone signals on a common data line.
Resources
EVAL-MIC-ALL
MEMS Microphone Evaluation Boards
Product Detail
Analog Devices has sold its MEMS Microphone product line to InvenSense.
Please visit the InvenSense MEMS Microphone site.This page describes all of the different evaluation board options for the different microphones.
Tools & Simulations 1
IBIS Model 1
IBIS Model
