The INMP421 is a low cost, low power, digital output bottom ported omnidirectional 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 INMP421 has a high SNR and a high sensitivity making it an excellent choice for far field applications. The INMP421 has a flat wideband frequency response resulting in natural sound with high intelligibility. Low current consumption and a sleep mode enable long battery life for portable applications. The INMP421 complies with the TIA-920 Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones standard.

The INMP421 is 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.

Product Details

Part # Market Status Output Port Location SNR AOP Sensitivity Package Size
UNITS: dBA dB SPL dbfs (mm)

Not Recommended for New Designs

Part # Market Status Output Port Location SNR AOP Sensitivity Package Size
UNITS: dBA dB SPL dbfs (mm)
INMP421
INMP421
NR/ND PDM Bottom 61 120 -26 3 x 4 x 1

Features

  • Small and Thin 3 mm × 4 mm × 1 mm Surface Mount Package
  • SNR 61 dBA
  • High Sensitivity -26 dBFS
  • Flat Frequency Response from 100 kHz to 15 kHz
  • Low Current Consumption < 650 μAmps
  • High PSRR of 80 dBFS
  • 4th Order Sigma Delta Modulator
  • Digital PDM output
  • Compatible with Sn/Pb and Pb-Free Solder Processes
  • RoHS/WEEE Compliant
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