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Atmel transceiver IC with -93dBm sensitivity

Posted: 03 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? transceiver ic? atr2806? sige? bicmos?

Atmel Corp.'s new 2.4GHz transceiver IC is especially designed for digital cordless telephone applications, but can also be used for wireless data applications such as wireless Internet access, headsets, games and home entertainment.

According to the company, the new low-IF ATR2806 provides several unique features such as multiple handset operation and long distance coverage due to its excellent sensitivity (-93dBm at full data transmit bit rate of 1.152Mbps).

Manufactured using Atmel's SiGe BiCMOS process, the chip includes in the receive path a low-noise amplifier, image rejection mixer, low-IF filter, demodulator, RSSI and RX data as digital signal. It also includes a fully integrated VCO and PLL with an integrated Gaussian filter. Due to the high integration, only a few components are needed to design the RF section of a cordless telephone, said the press release. SAW filtering, matching components, IF tank circuitry and demodulator tank are not needed. The circuit also provides a digital receive signal, eliminating the need for any external data slicer.

Supporting various data transmit bit rates (1.152Mbps and 576Kbps), the device has a flexible interface to the baseband, so any standard DCT baseband IC can be used.

High sensitivity

Another main benefit is its high sensitivity of -99dBm. Atmel said this is a value not reached by any competing product as standard values are usually up to -94dBm. This allows coverage of longer distances (about 300m). The new architecture also enables longer talk and standby time compared to conventional concepts, the company added. Due to its fast-settling PLL, the base station can support up to 10 handsets (multiple handset function), whereas competitive products, using fixed data transmit rates, can only handle up to a maximum of 4 handsets, according to Atmel.

Samples of the ATR2806 in QFN32 packages are already available. Pricing starts at $4 for 10,000-unit quantities. To support design-in, demo boards with documentation, test results, schematics and Gerber files are also available.

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