WiMAX transceiver simplifies circuit design
Maxim Integrated Products
MAX2838
Single-chip WiMAX RF transceiver eliminates the need for a costly SAW filter and extra VCO circuitry required by existing superheterodyne solutions.
Maxim Integrated Products reckons its MAX2838 is the industry's first single-chip WiMAX RF transceiver in high-volume production.
This device eliminates the need for a costly SAW filter and extra VCO circuitry required by existing superheterodyne solutions, thus saving 50% BOM cost, significant component count, and board space.
Ideal for low-cost, 802.16d/802.16e WiMAX CPE products operating in the 3.3 to 3.9GHz band, the MAX2838 enables 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 saves space and BoM cost by integrating 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 1.5 to 28MHz.
This wide range of bandwidth support allows one radio BOM to support virtually all geographic markets where channel bandwidths differ according to each country's spectrum regulations.
Designed using Maxim's in-house, high-performance SiGe BiCMOS process, the MAX2838 provides the industry's best receiver performance.
It features a low 2.8dB receiver noise figure, -11dBm input IP3, and -39dBc integrated VCO phase noise, while consuming only 288mW of power.
The receiver has a 94dB gain-control range, digitally controlled in 2dB steps.
Receiver EVM is better than -35dB, and sideband suppression is better than 45dB.
The MAX2838's transmitter features a 60dB gain-control range, digitally controlled in 1dB steps.
It delivers a 0dBm linear output with a 64-QAM signal 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 basestations, 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 +2.7 to +3.6V supply.
It is available in a small, 6mm x 6mm, leadless, 48-pin TQFN package.
Pricing starts at US $8.13 (1000-up).
An evaluation kit is available to speed designs.
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