2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

The MAX2837 direct-conversion zero-IF RF transceiver is designed specifically for 2.3GHz to 2.7GHz wireless broadband systems. The MAX2837 completely integrates all circuitry required to implement the RF transceiver function, providing RF-to-baseband receive path; and baseband-to-RF transmit path, VCO, frequency synthesizer, crystal oscillator, and baseband/control interface. The device includes a fast-settling sigma-delta RF synthesizer with smaller than 20Hz frequency steps and a crystal oscillator, which allows the use of a low-cost crystal in place of a TCXO. The transceiver IC also integrates circuits for on-chip DC offset cancellation, I/Q error, and carrier-leakage detection circuits. Only an RF bandpass filter (BPF), crystal, RF switch, PA, and a small number of passive components are needed to form a complete wireless broadband RF radio solution.

The MAX2837 completely eliminates the need for an external SAW filter by implementing on-chip monolithic filters for both the receiver and transmitter. The baseband filters along with the Rx and Tx signal paths are optimized to meet stringent noise figure and linearity specifications. The device supports up to 2048 FFT OFDM and implements programmable channel filters for 1.75MHz to 28MHz RF channel bandwidths. The transceiver requires only 2µs Tx-Rx switching time, which includes frequency transient settling. The IC is available in a small, 48-pin thin QFN package measuring only 6mm x 6mm x 0.8mm.

Applications

* 802.16-2004 Fixed WiMAX® * Korea WiBro and 802.16e Mobile WiMAX * Dual Mode™ WiMAX/802.11b/g WiFi * Proprietary Wireless Broadband Systems * 4G/LTE Systems

* 2.3GHz to 2.7GHz Wideband Operation

* Complete RF Transceiver, PA Driver, and Crystal Oscillator

* 0dBm Linear OFDM Transmit Power

* -70dBr Tx Spectral Emission Mask

* 2.3dB Rx Noise Figure

* Tx/Rx I/Q Error and LO Leakage Detection

* Monolithic Low-Noise VCO with -39dBc Integrated Phase Noise

* Programmable Rx I/Q Lowpass Channel Filter

* Programmable Tx I/Q Lowpass Anti-Aliasing Filter

* Sigma-Delta Fractional-N PLL with 20Hz Step Size

* 45dB Tx Gain-Control Range

* 94dB Receive Gain-Control Range

* 60dB Analog RSSI Instantaneous Dynamic Range

* 4-Wire SPI Digital Interface

* I/Q Analog Baseband Interface

* Digitally Tuned Crystal Oscillator

* On-Chip Digital Temperature Sensor Read-Out

* +2.7V to +3.6V Transceiver Supply

* Low-Power Shutdown Current

* Small 48-Pin Thin QFN Package (6mm x 6mm x 0.8mm)