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Low power FSK transceiver operates in ISM band

Posted: 18 Aug 2010     Print Version  Bookmark and Share

Keywords:FSK  transceiver  ISM band  27MHz 

AS3900 27MHz FSK

austriamicrosystems offers the AS3900 27MHz FSK (frequency shift keying) low power transceiver that operates in the 27MHz worldwide ISM (industrial, scientific and medical) band. It avoids the interference found in the popular but cluttered 2.4GHz band and results in a lower amount of energy being absorbed by the human body (SAR or specific absorption rate). This is a key consideration for transmitters operated close to the human body such as a BAN (body area network) or MBAN (medical body area network).

The AS3900 low power transceiver features austriamicrosystems' built-in star network management protocol which offers a hardwired, royalty-free easy to use protocol for self-management of all network functions. The hardwired star network protocol simplifies product design and significantly reduces system power compared to alternative approaches requiring protocols that run full-time on an external or internal microcontroller. The low powered transceiver requires only 2.5µA in polling mode, and typically 3.8 and 4.9mA in receive and transmit modes respectively, including the power required to manage the star network.

Bruce Ulrich, director of Marketing Consumer and Communications at austriamicrosystems, stated, "With the AS3900 FSK transceiver, austriamicrosystems ushers in a new era of simplicity into the low powered transceiver market space. No longer do systems design engineers need to consult RF and network protocol experts when integrating low powered networked transceivers into their designs, and time to market for their products is greatly reduced."

The performance and capabilities of the AS3900 target a number of applications where low power short-range data exchange is required. Such applications include data transfer among devices close to a human body, such as medical and intelligent sporting goods, industrial automation, body area networks and any short range sensor network. An integrated wakeup receiver allows an ultra-low current consumption of only 2.5µA while in polling mode. The AS3900 operates with a small PCB antenna that resonates at 27MHz. Properties of 27MHz transmissions enable better penetration of fluids than 2.4GHz, and prevent reflections from giving errant range estimations using RSSI (received signal strength indication).

The AS3900 transmits data at up to 212Kbit/s and integrates a number of key features, resulting in a low bill of materials. Integrated functions include the power amplifier, clock, 24bit of OTP memory, battery level detection, power on reset (POR) and system timers. Digital RSSI, onboard CRC (cyclic redundancy check) and a bi-directional SDI bus (serial digital interface) allows for easy system integration.

The AS3900 low power transceiver is available in a 5x5mm 28-pin QFN package, operates from a 2.2V power supply, and has an ambient operating temperature range of -40 to +85�C.

Samples are available now. Pricing in 1,000-piece quantities is Rs.105.68 ($2.25).

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