19-3218; Rev 1; 3/08
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
MAX2839
General Description
Features
The MAX2839 direct conversion, zero-IF, RF transceiver
is designed specifically for 2GHz 802.16e MIMO mobile
WiMAX systems. The device incorporates one transmit-
ter and two receivers, with >40dB isolation between
each receiver. The MAX2839 completely integrates all
circuitry required to implement the RF transceiver func-
tion, providing RF to baseband receive path, and base-
band to RF transmit path, VCO, frequency synthesizer,
crystal oscillator, and baseband/control interface. The
device includes a fast-settling sigma-delta RF synthe-
sizer with smaller than 40Hz frequency steps and a
crystal oscillator that 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. An internal trans-
mit to receive loopback mode allows for receiver I/Q
imbalance calibration. The local oscillator I/Q quadra-
ture phase error can be digitally corrected in approxi-
mately 0.125° steps. 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.
♦ 2.3GHz to 2.7GHz Wideband Operation
♦ Dual Receivers for MIMO, Single Transmitter
♦ Complete RF Transceiver, PA Driver, and Crystal
Oscillator
2.3dB Rx Noise Figure on Each Receiver
-35dB Rx EVM for 64QAM Signal
0dBm Linear OFDM Transmit Power (64QAM)
-70dBr Tx Spectral Emission Mask
-35dBc LO Leakage
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
Filters
Sigma-Delta Fractional-N PLL with < 40Hz Step
62dB Tx Gain Control Range with 1dB Step
Size, Digitally Controlled
95dB Rx Gain Control Range with 1dB Step
Size, Digitally Controlled
The MAX2839 completely eliminates the need for an
external SAW filter by implementing on-chip program-
mable monolithic filters for both the receiver and trans-
mitter, for all 2GHz and 802.16e profiles and WIBRO.
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 chan-
nel filters for 3.5MHz to 20MHz RF channel bandwidths.
The transceiver requires only 2µs Tx-Rx switching time.
The IC is available in a small 56-pin TQFN package
measuring 8mm x 8mm x 0.8mm.
60dB Analog RSSI Instantaneous Dynamic
Range
4-Wire SPI™ Digital Interface
I/Q Analog Baseband Interface
Digital Tx/Rx Mode Control
Digitally Tuned Crystal Oscillator
On-Chip Digital Temperature Sensor Readout
♦ +2.7V to +3.6V Transceiver Supply
♦ Low-Power Shutdown Current
♦ Small, 56-Pin TQFN Package (8mm x 8mm x
0.8mm)
Applications
802.16e Mobile WiMAX™ Systems
Ordering Information
Korean WIBRO Systems
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
Proprietary Wireless Broadband Systems
802.11g or n WLAN with MRC or MIMO Down Link
MAX2839ETN+TD -40°C to +85°C 56 TQFN-EP* T5688+2
+Denotes a lead-free package.
T = Tape and reel.
*EP = Exposed paddle.
D = Dry pack.
WiMAX is a trademark of the WiMAX Forum.
SPI is a trademark of Motorola, Inc.
Pin Configuration and Block Diagram/Typical Operating
Circuit appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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