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Low-power FSK transceiver operates at 27MHz

Posted: 09 Aug 2011 ?? ?Print Version ?Bookmark and Share

Keywords:transceiver IC? FSK? star network?

austriamicrosystems AG has announced that Echowell will be using its frequency shift keying (FSK) low-power transceiver IC with integrated Link Manager that according to the company can transmit data up to 212Kbit/s. The AS3900 27MHz FSK features integrated functions that include power amplifier, clock, 24bits of OTP memory, battery level detection, system timers and power on reset that result in low BOM. The transceiver also has digital RSSI, onboard cyclic redundancy check (CRC) and a bi-directional serial digital interface (SDI) bus that allow for easy system integration.

"The AS3900's high level of integration, ease of use, ultra-low power capabilities and superior performance in close proximity to the human body make it well-suited for applications such as Echowell's bike computers, as well as other fitness and medical products," said Johnsy Varghese, marketing manager wireless for austriamicrosystems.

According to the company, the transceiver IC offers a hardwired, royalty-free protocol for self-management of all network functions. The FSK transceiver features a built-in star network management protocol that simplifies product design. It also significantly reduces system power compared to alternative approaches requiring protocols that run full-time on an external or internal MCU, the company stated. It is the only transceiver with a small PCB antenna in the 27MHz worldwide ISM (industrial, scientific and medical) band. austriamicrosystems added that operation in this band avoids the interference found in the popular but cluttered 2.4GHz band and results in only a low level of energy absorbed by the human bodymeasured in specific absorption rate (SAR). This is a key consideration for transmitters that operate close to the human body such as a body area network (BAN) or medical body area network (MBAN). The IC requires only 2.5?A in standby polling mode, and typically 3.8 and 4.9mA in receive and transmit modes respectively, including the power required to manage the star network.

The performance and capabilities of the IC make it ideal for applications where low-power, short-range data exchange is required, the company noted. These include data transfer among devices close to a human body such as intelligent sporting goods, industrial automation and any short-range sensor network. The AS3900 low-power FSK transceiver is available in a 5 x 5mm 28-pin QFN package, operates from a 2.2V power supply and has an ambient operating temperature range of -40C to 85C.

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