Maxim Integrated Products introduces the MAX2838, a WiMAX RF transceiver in high-volume production that eliminates the need for a SAW filter and the VCO circuitry required by available superheterodyne products. As a result, the company reports that the device saves 50% BOM cost, reducing component count and board space. It is targeted at low-cost, 802.16d/802.16e WiMAX CPE products operating in the 3.3GHz to 3.9GHz band, especially for affordable wireless broadband services in BRIC countries (Brazil, Russia, India, China), as well as in Western Europe, Australia, and Canada.
Whereas superheterodyne solutions require an external SAW filter for channel filtering, the MAX2838 integrates monolithic baseband filters for both the receiver and transmitter. An SPI-compatible interface enables electronic programming of channel filtering to support multiple channel bandwidths from 1.5MHz to 28MHz.
Designed using the company's SiGe BiCMOS process, the MAX2838 receiver features: 2.8dB receiver noise figure; -11dBm input IP3; -39dBc integrated VCO phase noise; 288mW power consumption; 94dB gain-control range, digitally controlled in 2dB steps; receiver EVM ob better than -35dB; and sideband suppression is better than 45dB.
The MAX2838's transmitter features: 60dB gain-control range, digitally controlled in 1dB steps; 0dBm linear output with a 64-QAM signal; better than 45dB sideband suppression; and better than -36dB EVM while meeting a -70dBr spectral mask.
The high linearity of the transmitter output allows this transceiver to be used in WiMAX pico or femto base stations, subscriber CPE or PC cards, and USB dongle devices. Additionally, a unique master/slave mode allows two MAX2838 transceivers to operate in MIMO (multiple-input-multiple-output) or MRC (maximal-ratio-combining) configurations for improved system range and data throughput performance.
The MAX2838 operates from a +2.7V to +3.6V supply. It is available in a 6mm x 6mm, leadless, 48-pin TQFN package. Pricing starts at $8.13 (1000-up, FOB USA). An evaluation kit is available to speed designs.
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