STMicroelectronics IMP23ABSU
Analog bottom port microphone with frequency response up to 80kHz for ultrasound analysis and predictive maintenance applications
The IMP23ABSU is a compact, low-power microphone built with a capacitive sensing element and an IC interface. The sensing element, capable of detecting acoustic waves, is manufactured using a specialized silicon micromachining process to produce audio sensors.
The IMP23ABSU has an acoustic overload point of 130 dBSPL with a typical 64 dB signal-to-noise ratio.
The sensitivity of the IMP23ABSU is -38 dBV ±1 dB @ 94 dBSPL, 1 kHz.
The IMP23ABSU is available in a package compliant with reflow soldering and is guaranteed to operate over an extended temperature range from -40 °C to +85 °C.
Key features
- Single supply voltage range from 1.52V to 3.6V
- Omnidirectional sensitivity, high signal-to-noise ratio
- Package compliant with reflow soldering, enhanced RF immunity
- Ultra-flat frequency response, low latency
- Current consumption is 120µA typical at (Vdd = 2.75V, no load, Tamb = 25°C)
- Signal-to-noise ratio is 64dB typical at (Vdd = 2.75V, no load, Tamb = 25°C)
- Power supply rejection ratio is 60dB typical at (100mVpp sine wave, 1KHz, Vdd <gt/> 1.6V)
- Load resistance is 15Kohm minimum at (100mVpp sine wave, 1KHz, Vdd <gt/> 1.6V)
- Sensitivity is -38dBV typical at (Vdd = 2.75V, no load, Tamb = 25°C)
- Operating temperature range from -40°C to +85°C, 5-lead RHLGA package
Applications
- Condition monitoring of industrial equipment
- Leak detection
- Electrical arcing
- Smart medical instruments
- Wearable devices
- Hearables
- Smart speakers
- Active noise-canceling headsets
Available tools
STEVAL-STWINKT1B:
STWIN SensorTile Wireless Industrial Node development kit and reference design for industrial IoT applications
The STWIN SensorTile wireless industrial node (STEVAL-STWINKT1B) is a development kit and reference design that simplifies prototyping and testing of advanced industrial IoT applications such as condition monitoring and predictive maintenance. The kit features a core system board with a range of embedded industrial-grade sensors and an ultra-low-power microcontroller for vibration analysis of 9-DoF motion sensing data across a wide range of vibration frequencies, including very high frequency audio and ultrasound spectra, and high precision local temperature and environmental monitoring.
Microphone coupon board based on the IMP23ABSU analog MEMS microphone
The STEVAL-MIC007V1 is a daughterboard containing 4 IMP23ABSU MEMS microphones. The coupon concept allows easy performance testing of ST MEMS microphones. It is possible to detach the single PCBs hosting each microphone.
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