The T4078 is an analog MEMS microphone with very high dynamic range and a low-power AlwaysOn mode. The T4078 includes a MEMS microphone element, an impedance converter, and an output amplifier.
This microphone features a low-power mode, which is active when the supply voltage is <1.9V. In this mode, the T4078 operates with max. 85 μA
Other specifications in high performance mode include 135 dB SPL acoustic overload point, tight ±1 dB sensitivity tolerance and 66 dB(A) SNR.
The T4078 is available in a very small 3.35 mm × 2.5 mm × 0.98 mm bottom port surface-mount package.
MPN: MMICT4078-00-908
| Part # | Market Status | Output | Port Location | SNR | AOP | Sensitivity | Package Size | LF Cutoff |
|---|---|---|---|---|---|---|---|---|
| UNITS: | dBA | dB SPL | dBV | (mm) | Hz |
| Part # | Market Status | Output | Port Location | SNR | AOP | Sensitivity | Package Size | LF Cutoff |
|---|---|---|---|---|---|---|---|---|
| UNITS: | dBA | dB SPL | dBV | (mm) | Hz | |||
 T4078 |
NR/ND | Analog | Bottom | 66 | 135 | -38 | 3.35 x 2.5 x 0.98 | N/A |
AN-100 – MEMS Microphone Handling and Assembly Guide
AN-1112 – Microphone Specifications Explained
AN-1124 – Recommendations for Sealing InvenSense Bottom-Port MEMS Microphones from Dust and Liquid Ingress
AN-1140 – Microphone Array Beamforming
AN-1003 – Recommendations for Mounting and Connecting InvenSense MEMS Microphones
AN-1165 – Op Amps for MEMS Microphone Preamp Circuits
Low Self Noise: The First Step to High-Performance MEMS Microphone Applications
Analog and Digital MEMS Microphone Design Considerations
Understanding Microphone Sensitivity
