max2837 pdf datasheet

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.

MAX2837直接变频、零IF RF收发器设计用于2.3GHz至2.7GHz无线宽带系统。MAX2837完全集成了实现RF发送器功能所需的全部电路，提供RF至基带接收通道、基带至RF发送通道、VCO、频率合成器、晶体振荡器和基带/控制接口。器件包含具有快速建立时间的Σ-Δ RF合成器，具有小于20Hz的频率步长和晶体振荡器，允许使用低成本的TCXO晶体。该收发器IC还集成了片上DC偏移消除和I/Q误码以及载波泄漏检测电路。仅需RF带通滤波器(BPF)、晶体、RF开关和一对非平衡变压器以及少量的无源器件即可构建完整的无线宽带RF雷达解决方案。

MAX2837为接收器和发送器集成了完整的片上滤波器，完全无需外部SAW滤波器。基带滤波器以及Rx和Tx信号通道经过优化，满足严格的噪声系数和线性度指标。该器件支持高达2048 FFT的OFDM，并为1.75MHz至28MHz RF通道带宽实现可编程通道滤波器。收发器仅需2µs Tx-Rx切换时间，包括频率瞬态建立时间。该IC提供小型、48引脚薄型QFN封装，尺寸仅为6mm x 6mm x 0.8mm。