USound GmbH. MEMS-based microspeaker. headphones, wearables and array applications
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1 MEMS-based microspeaker for headphones, wearables and array applications Features Small form factor High flexibility for acoustic system integration Low heat generation Description Adap is a MEMS-based micro-speaker for occluded-ear headphones, and can also be used as micro-tweeter for wearables and array applications No magnetic field High input impedance suitable for thin wires or PCB traces 1
2 Test conditions Measured with IEC coupler Measured with IEC baffle Coupler type IEC (711) Baffle type IEC Coupler Volume 1.4cm³ Mic distance 3cm Connection tube length 1.6mm Reference distance 1cm Connection tube diameter 3.7mm Microphone GRAS 43AC Microphone GRAS 46AC Microphone diameter 1/2" Microphone Amplifier B&K Nexus Microphone Amplifier B&K Nexus Loudspeaker Amplifier G.R.A.S. 12AU Loudspeaker Amplifier G.R.A.S. 12AU Measurement System APx 526 Measurement System APx 526 Measurement Signal Exp. Sweep Measurement Signal Exp. Sweep 1Hz - 2kHz 1kHz - 2kHz 2kHz - khz 2kHz - khz p 5Vp p 5Vp Impedance 1Hz [Ω] kHz [Ω] kHz [Ω] 648 4kHz [Ω] 161 Capacity 1Hz [nf] 34 1kHz [nf] 33 1kHz [nf] 25 4kHz [nf] 25 2
3 THD [%] SPL [db] SPL [db] Acoustic parameters IEC coupler SPL drive) Audio Range (1Hz-2kHz) SPL (@5Vp drive) Ultrasound Range (2kHz-kHz) Audio Range (1Hz-2kHz) Ultrasound Range (2kHz-kHz) THD (94dB Audio Range (1Hz-2kHz)
4 THD [%] SPL1cm [db] SPL1cm [db] Acoustic parameters IEC baffle SPL drive) Audio Range (1kHz-2kHz) Audio Range (1kHz-2kHz) SPL (@5Vp drive) Ultrasound Range (2kHz-kHz) Ultrasound Range (2kHz-kHz) THD (db Audio Range (1kHz-2kHz)
5 Mechanical Dimensions 5
6 Connectivity The speaker is driven by applying a voltage between the connections for top electrode (TE) and bottom electrode (BE). The potential of BE has to be always equal or higher than the TE. To ensure that, a DC voltage together with the AC signal have to be applied on BE. Attention: The AC peak voltage must be always smaller or equal the DC voltage. Operating conditions Maximum AC Voltage (Peak) up to 2kHz [VP] 15 Maximum AC Voltage (Peak) up to 4kHz [VP] 5 Maximum DC Voltage [V] 15 Maximum Current (ACPeak) [ma] 2 Test-Box Adap can be delivered with a default test-box with a back volume of 1mm³. This box provides, besides the necessary sealing to avoid an acoustic short circuit, a convenient way to connect Adap to the AC and DC Signal. Adap must be placed in the bottom shell, make sure that the pins on the box connect to the correct contact-pads on the speaker. Tighten the screws after closing the box to ensure proper sealing. Top electrode (TE) Bottom electrode (BE) Green Blue ( USound ) makes no warranties for the use of USound products, other than those expressly contained in USound s applicable General Terms of Sale, located at USound assumes no responsibility for any errors which may have crept into this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No license to patents or other intellectual property rights of USound are granted in connection with the sale of USound products, neither expressly nor implicitly. In respect of the intended use of USound products by customer, customer is solely responsible for observing existing patents and other intellectual property rights of third parties and for obtaining, as the case may be, the necessary licenses. Important note: The use of USound products as components in medical devices and/or medical applications, including but not limited to, safety and life supporting systems, where malfunctions of such USound products might result in damage to and/or injury or death of persons is expressly prohibited, as USound products are neither destined nor qualified for use as components in such medical devices and/or medical applications. The prohibited use of USound products in such medical devices and/or medical applications is exclusively at eh risk of the customer. 6
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