MEMS microphone offers high performance to mass market
Aimed directly at mobile-handset manufacturers, the AKU340 analog MEMS microphone uses a dual-chip design (it has a MEMS device created with a well-established surface-micromachining process as well as a separate ASIC for signal processing) to consistently provide excellent acoustic performance. With an SNR of 63 dB, the 2.5 x 3.35 x 1.0-mm unit has a very flat response curve over a 50 Hz to 20 kHz range, with sensitivity of less than 5 dB at 50 Hz so it can achieve superior low-frequency recording.
Tight sensitivity matching between microphones (-38 dBV/Pa +/-2 dB at 1kHz and 94 dB SPL) allows the microphone to provide unit-to-unit performance consistency in mass-produced electronic goods, which is beneficial whether the microphone is used by itself, or in a microphone array where its uniformity increases noise-suppression performance. At 114 dB SPL, total harmonic distortion is less than 5%, ensuring capture of the true sound.
The device works from a 1.6 to 3.6-V supply, consuming less the 300 μA at 1.8 V while providing power supply rejection greater than 60 dB. It’s bottom-ported package is shielded for RF and EM immunity. ($1.34 ea / 1,000 — samples available now, prod qty 3rd qtr.)
By Richard Comerford
Akustica , Pittsburgh , PA
Information 412-390-1730
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