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Maxim zero-IF transceiver has 7-by-7mm footprint

Posted: 01 Oct 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated product? max2820? rfic? rf transceiver? zero if transceiver?

The MAX2820 SiGe zero-IF transceiver from Maxim Integrated Products is available in a 48-pin QFN leadless package with a footprint of 7-by-7mm and is claimed by the company to be the industry's smallest RF transceiver designed specifically for 802.11b WLAN applications.

The single-chip design features direct conversion architecture and integrated baseband filters for both receiver and transmitter, which requires only one RF bandpass filter. Older superhet radio designs require at least three RF/IF chips, three RF bandpass filters, an IF SAW filter, and about 30 additional passive components.

The receiver features a 4.5dB NF at high gain and a best-in-class receiver sensitivity of -85dBm at 11Mbps and 10(-5) BER. It has sensitivity 2dB to 3dB better than other competing zero-IF designs, which translates to a 26 percent improved range for indoor applications.

The transmitter delivers 2dBm of linear output power under 11Mbps CCK signal. Spurious emissions are 80dB below the desired signal, while the transmitter output noise is typically -135dBm/Hz at 22MHz offset.

The transceiver also integrates a receive baseband AGC with >65dB range, transmit power control of >25dB range, monolithic low phase noise VCO, PLL and with 3-wire interface. It also has a complete baseband interface compatible with most 802.11b baseband chips on the market.

The MAX2820 operates over a supply range of 2.7V to 3.6V and is priced at $9.95 in 10,000 and up unit quantities.

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