ST MICROELECTRONICS IMP23ABSU Datasheet
IMP23ABSU
Datasheet
High-performance MEMS microphone with extended frequency response up to
80 kHz for ultrasound applications
Features
• Single supply voltage operation 1.52 V - 3.6 V
• Omnidirectional sensitivity
• High signal-to-noise ratio
• High acoustic overload point: 130 dBSPL typ.
• Package compliant with reflow soldering
• Enhanced RF immunity
• Ultra-flat frequency response
• Ultrasound bandwidth (up to 80 kHz)
• Low latency
• Ultra-low-power: 150 µA max.
• ECOPACK, RoHS, and “Green” compliant
Product status link
IMP23ABSU
Product summary
Order code IMP23ABSU IMP23ABSUTR
Temp. range
[°C]
Package (3.5 x 2.65 x 0.98) mm
Packing Tray Tape and reel
Product label
-40 to +85
Applications
• Condition monitoring of industrial equipment
• Leak detection
• Electrical arcing
• Smart medical instruments
• Wearable devices
• Hearables
• Smart speakers
• Active noise-canceling headsets
Description
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.
DS13376 - Rev 2 - September 2020
For further information contact your local STMicroelectronics sales office.
www.st.com
1 Pin description
IMP23ABSU
Pin description
Figure 1. Pin connections (bottom view)
Table 1. Pin description
Pin number
1 Out Output
2 GND GND
3 GND GND
4 GND GND
5 Vdd Supply voltage
Pin name Function
DS13376 - Rev 2
page 2/15
2 Acoustic and electrical specifications
2.1 Acoustic and electrical characteristics
The values listed in the table below are specified for Vdd = 2.75 V, no load, Tamb = 25 °C unless otherwise
specified.
Table 2. Acoustic and electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
Vdd Supply voltage 1.52 2.75 3.6 V
Idd Current consumption 120 150 µA
So Sensitivity 1 kHz @ 94 dBSPL -39 -38 -37 dBV
SNR Signal-to-noise ratio 64 dB(A)
PSRR Power supply rejection 100 mVpp sine wave, 1 kHz, Vdd > 1.6 V 60 dB
AOP Acoustic overload point 130 dBSPL
Rload
1. Guaranteed by design
Load resistance
Top Operating temperature range -40 +85 °C
(1)
IMP23ABSU
Acoustic and electrical specifications
15 kΩ
DS13376 - Rev 2
page 3/15
2.2 Frequency response
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1000 10000
Sensitivity (dB)
Frequency (Hz)
-15
-10
-5
0
5
10
15
20
20000 30000 40000 50000 60000 70000 80000
Sensitivity [dB]
Frequency [Hz]
Figure 2. Typical free-field frequency response normalized at 1 kHz
IMP23ABSU
Frequency response
Table 3. Frequency response mask
Frequency (Hz)
35 -2 0 dBr 1kHz
100 -1.5 0.5 dBr 1kHz
900 -1 1 dBr 1kHz
1000 0 0 dBr 1kHz
1100 -1 1 dBr 1kHz
8000 -1 4 dBr 1kHz
15000 0 9 dBr 1kHz
LSL USL Unit
Figure 3. Typical ultrasonic free-field response normalized to 1 kHz
DS13376 - Rev 2
page 4/15
3 Absolute maximum ratings
Stresses above those listed as “Absolute maximum ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device under these conditions is not implied. Exposure to
maximum rating conditions for extended periods may affect device reliability.
Table 4. Absolute maximum ratings
Symbol Ratings Maximum value Unit
Vdd Supply voltage -0.5 to 4.8 V
T
STG
This device is sensitive to mechanical shock, improper handling can cause permanent damage to the part.
Storage temperature range -40 to +125 °C
IMP23ABSU
Absolute maximum ratings
This device is sensitive to electrostatic discharge (ESD), improper handling can cause permanent damage to the part.
DS13376 - Rev 2
page 5/15
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