Product category: Keyboards, Switches and other Human/Machine Interfaces
News Release from: Knowles Acoustics | Subject: Zero-Height SiSonic
Edited by the Electronicstalk Editorial Team on 17 August 2004
Silicon microphone hides under PCBs
The "Zero-Height" SiSonic silicon microphone, based on semiconductor technology, is now available for general commercial purchase
The surface mount capability of this new addition to the expanding SiSonic product line, makes it ideally suited for mobile phones and other applications where minimal component height is required on one side of the customer's PCB. Designed for space-sensitive applications, the Zero-Height SMD microphone is mounted under the PCB, allowing for a tight spacing between the board and the outer housing of the product.
This article was originally published on Electronicstalk on 17 August 2004 at 8.00am (UK)
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It offers a unique technology by developing a solder connection between the microphone and the customer's PCB to achieve an acoustic seal around the port hole, thus reducing costs and simplifying mechanical and acoustical design.
At 1kHz, the 1.75 x 6.15 x 3.75mm omnidirectional devices have a nominal sensitivity of -42dB, an output impedance of less than 100ohm, and a total harmonic distortion of less than 1% at 100dB SPL.
The zero-height design allows engineers to achieve virtual "zero additional height" on the top side of their PCBs.
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Knowles Acoustics has expanded its proven line of electret condenser microphones with 3mm devices available in both omnidirectional and unidirectional types
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The microphone can be assembled using standard automatic pick-and-place equipment, conforms to lead-free requirements, and is compatible with typical industry Pb-free solder profiles (260C reflow for 30s maximum).
This eliminates offline hand assembly, bulky and expensive connectors, and associated testing and rework issues/costs typical with traditional ECMs.
"With the release of the Zero-Height SiSonic, Knowles Acoustics continues to develop new products and technologies that exceed the demands of our customers in the mobile phone and handheld electronics market".
"This revolutionary SMD microphone allows our customers to either reduce the overall package size of their end product, or add in additional features".
"In addition, they also realise cost savings in manufacturing over traditional ECMs", said Jeffrey Niew, Vice President and General Manager.
The SiSonic is available with a standard supply voltage range of 1.5 to 5V.
It has integrated EMI/RFI protection, an important feature for handheld communication devices.
Another key attribute is the microphone's operating temperature.
Compared to the typical rating of less than 85C for the ECMs, the SiSonic is rated up to 100C.
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