Maxim Integrated Products has introduced the MAX2839, reporting that it is the industry's first single-chip, 2.3GHz to 2.7GHz, WiMAX MIMO RF transceiver in high-volume production. This device uses a dual-receiver architecture to mitigate RF channel fading. The company boasts that this increases the signal-to-noise ratio (SNR) by as much as 10dB compared to a single-receiver architecture. The new part is designed to increase data throughput and radio-link range for nomadic and mobile WiMAX subscriber applications in notebook computers, express/PC cards, smartphones, and in-home desktop modems. Currently shipping in volume to customers worldwide, the MAX2839 is well suited for use in mobile WiMAX, Korean WiBro, and other OFDM-based wireless broadband systems.
Designed using Maxim's in-house SiGe BiCMOS process, the receivers feature a noise figure of 2.3dB, -81dBm sensitivity for a 64-QAM signal at 5MHz channel bandwidth, and a 95dB gain control range that is digitally controlled in 1dB steps. Factory calibrated to achieve better than -35dB EVM, -45dBc of sideband suppression, and carrier leakage of -40dBc without DC-offset correction, the receivers are designed to simplify integration with a digital MAC/baseband IC.
On the transmitter, the MAX2839 features a 62dB gain control range, digitally controlled in 1dB steps. It delivers a 0dBm linear output with a 64-QAM signal, greater than -45dBc of sideband suppression, and more than -36dB EVM, while meeting a -70dBr spectral mask.
The MAX2839 operates from a 2.7V to 3.6V supply. A low-power shutdown mode reduces current consumption to 10 microamps to save power in system-sleep/standby mode. This transceiver is available in an 8mm x 8mm, leadless, 56-pin TQFN package. Pricing starts at $9.31 (1000-up, FOB USA). An evaluation kit is available.
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