Table 1.
Properties of used MEMS microphones [25].
| Parameter | Conditions | Minimum | Type | Maximum | Units |
|---|---|---|---|---|---|
| Supply Voltage | 1.5 | 3.6 | V | ||
| Supply Current | 120 | 160 | A | ||
| Sensitivity | 94 dB SPL @ 1 kHz | −41 | −38 | −35 | dBV/Pa |
| Signal to Noise Ratio | 94 dB SPL @ 1 kHz, A-weighted | 63 | dB(A) | ||
| Total Harmonic Distortio | 94 dB SPL @ 1 kHz, S = Typ, Rload > 3 kΩ | 0.15 | 0.2 | % | |
| Acoustic Overload Point | 10% THD @ 1 kHz, S = Typ, VDD = 3.6 V, Rload > 3 kΩ | 116 | 118 | dB SPL | |
| DC Output | VDD = 1.5 V | 0.73 | V | ||
| Output Impedance | @ 1 kHz | 400 | Ω | ||
| Directivity | Omnidirectional | ||||
| Polarity | Increasing sound pressure | Increasing output voltage | |||