The MAX2838 direct-conversion, zero-IF, RF transceiver
is designed specifically for 3.3GHz to 3.9GHz wireless
broadband systems. The MAX2838 completely
integrates all circuitry required to implement the RF
transceiver function, providing RF-to-baseband receive
path, baseband-to-RF transmit path, VCO, frequency
synthesizer, and baseband/control interface. The
device includes a fast-settling sigma-delta RF synthesizer
with smaller than 29Hz frequency steps. The
MAX2838 supports 2Tx, 2Rx MIMO applications with a
master device providing coherent LO to the slave
device. 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), TCXO, RF switch, PA, and a small number of
passive components are needed to form a complete
wireless broadband RF radio solution.
The MAX2838 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 the stringent noise figure and linearity
specifications. The device supports up to 2048-FFT
OFDM and implements programmable channel filters
for 1.5MHz to 28MHz RF channel bandwidths. The
transceiver requires only 2µs Tx-Rx switching time. The
IC is available in a small 48-pin thin QFN package measuring
only 6mm x 6mm x 0.8mm.
Key Features
Applications/Uses
3.3GHz to 3.9GHz Wide-Band Operation
Master-Slave Modes with Coherent LO for MIMO
Complete RF Transceiver, and PA Driver
0dBm Linear OFDM Transmit Power
-70dBr Tx Spectral Emission Mask
2.8dB Rx Noise Figure
Tx/Rx I/Q Error and LO Leakage Detection and Adjustment
Automatic Rx DC Offset Correction
Monolithic Low-Noise VCO with -39dBc Integrated Phase Noise
Programmable Rx I/Q Lowpass Channel Filters
Programmable Tx I/Q Lowpass Anti-Aliasing Filter
Sigma-Delta Fractional-N PLL with 29Hz Step Size
60dB Tx Gain Control Range with 1dB Step Size, Digitally Controlled
94dB Rx Gain Control Range with 2dB Step Size, Digitally Controlled
