The T3904 is a multi-mode, low noise digital MEMS microphone in a small package. The T3904 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 T3904 has multiple modes of operation: High Quality, Low-Power (AlwaysOn), and Sleep. The T3904 has high SNR in all operational modes. It has 135 dB SPL AOP in High Quality Mode and 120 dB SPL AOP in Low-Power mode.

The T3904 is available in a standard 3.5 × 2.65 × 0.98 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation.

Product Details

Part # Market Status Output Port Location SNR AOP Sensitivity Package Size LF Cutoff
UNITS: dBA dB SPL dbfs (mm) Hz
T3904
T3904
Production PDM Bottom 66 135 -46 3.5 × 2.65 × 0.98 40

Documentation & Resources

Features

  • 3.5 × 2.65 × 0.98 mm surface-mount package
  • Extended frequency response from 40 Hz to >20 kHz
  • Sleep Mode: 9 μA
  • Fourth-order Σ-Δ modulator
  • Digital pulse density modulation (PDM) output
  • Compatible with Sn/Pb and Pb-free solder processes
  • RoHS/WEEE compliant

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