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Smallest direct conversion RF transceiver

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MAXIM Integrated Products, distributed by Arrow Electronics , has introduced the MAX2820 SiGe zero-IF transceiver, the industry's smallest RF transceiver designed specifically for 802.11b WLAN applications.

The single-chip design features a direct conversion (or zero-IF) architecture and integrated baseband filters for both receiver and transmitter.

Only one low-cost ceramic RF bandpass filter is required. Older superhet radio designs require at least three RF/IF chips, three RF bandpass filters, an IF SAW filter, and approximately 30 additional passive components.

The significant reduction in component count improves manufacturing yields, product reliability, and overall cost.

Combined with the MAX2242 chip-scale power amplifier (PA), the MAX2820/MAX2242 complete RF solution occupies less than 300mm2 of board space. This compact design is ideal for small form factor WLAN applications such as compact flash, mini-PCI, and SD cards.

The MAX2820 receiver features a 4.5dB noise figure at high gain and a best-in-class receiver sensitivity of -85dBm at 11Mbps and 10-5 BER. The sensitivity is 2dB to 3dB better than other competing zero-IF designs, which translates to 26% 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; 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 with 3-wire interface, and complete baseband interface.

The baseband interface is standard analog I/O, compatible with virtually all 802.11b baseband chips on the market.

The MAX2820 operates over a supply range of 2.7V to 3.6V. It is available in the 48-pin QFN leadless package measuring only 7mm x 7mm.

A fully assembled evaluation kit is available to help reduce design time. Visit www.maxim-ic.com for the complete data sheet.

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