Product category:
Communications ICs (Wireless)
News Release from: Vishay RFWaves | Subject: RFW322-M
Edited by the Electronicstalk Editorial
Team on 05 December 2005
Transceiver finds home in headset design
Vishay RFWaves has released a full reference design for a USB-based wireless headset using a fully digital 2.4GHz wireless link.
Vishay RFWaves has released a full reference design for a USB-based wireless headset using a fully digital 2.4GHz wireless link Target applications for the system include VoIP, PC-based cordless telephony and PC-based "intelligent" toys
This article was originally published on Electronicstalk on 24 Dec 2007 at 8.00am (UK)
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The new design uses the Vishay RFWaves RFW322-M 3Mbit/s direct sequence spread spectrum (DSSS) half-duplex transceiver as its core component and includes specifications for both the wireless headset/handset and the USB dongle.
The RFW322-M provides an output power of 7dBm and receiver sensitivity of -75dBm while delivering 16bit PCM, 8000 samples/second voice quality.
The specified operating range for the design is 6m and can be extended to 25m with the addition of an RF power amplifier.
The high 2.4GHz bandwidth of the RFW322-M and the exceptional link robustness results in a very reliable and high-quality voice link.
The use of printed diversity antennas for the USB further helps to overcome link losses.
The USB dongle component of the reference design specifies the use of a microcontroller to exchange voice/data packets with the PC, to execute a proprietary wireless communication protocol to transfer data over the air, and to perform an antenna diversity algorithm.
The dongle uses the Vishay RFWaves RFW322-M as its wireless transceiver.
The dongle is powered by the USB port and typically draws 70mA.
In the remote headset/handset unit, a microcontroller executes the proprietary communication protocol to exchange data with the USB dongle while feeding incoming data to a high-quality mixed-signal codec.
The codec provides analogue signals for the speaker and microphone in the headset or handset.
The remote unit draws 40mA and is designed to run for up to four hours from a single lithium-ion battery cell.
The system has been designed and tested to coexist with 802.11b/g and Bluetooth and is compliant with FCC, ETSI and Telec regulations.
Pricing for the RFW322-M transceiver, which is available now, starts at $3.30 each in 10,000-piece quantities.
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