19-4588; Rev 1; 5/10
2.3GHz to 2.7GHz MIMO Wireless
Broadband RF Transceiver
MX2839AS
General Description
Features
The MAX2839AS direct conversion, zero-IF, RF transceiver
is designed specifically for 2.3GHz to 2.7GHz 802.16e
MIMO mobile WiMAX™ systems. The device incorpo-
rates one transmitter and two receivers, with > 40dB iso-
lation between each receiver. The MAX2839AS
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 base-
band/control interface. The device includes a fast-set-
tling sigma-delta RF synthesizer 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 trans-
ceiver IC also integrates circuits for on-chip DC-offset
cancellation, I/Q error, and carrier leakage detection
circuits. An internal transmit to receive loopback mode
allows for receiver I/Q imbalance calibration. The local
oscillator I/Q quadrature phase error can be digitally
corrected in approximately 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.
o 2.3GHz to 2.7GHz Wideband Operation
o Dual Receivers for MIMO, Single Transmitter
o Complete RF Transceiver, PA Driver, and Crystal
Oscillator
3.5dB Rx Noise Figure on Each Receiver with
Balun
-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 28.61Hz
Minimum Step Size
62dB Tx Gain Control Range with 1dB Step
Size, Digitally Controlled
The MAX2839AS 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 lin-
earity specifications. The device supports up to 2048
FFT OFDM and implements programmable channel fil-
ters for 3.5MHz to 20MHz RF channel bandwidths. The
transceiver requires only 2µs Tx-Rx switching time. The
IC is available in a small wafer-level package (WLP)
measuring 5.16mm x 3.66mm x 0.5mm.
95dB Rx Gain Control Range with 1dB Step
Size, Digitally Controlled
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
o +2.7V to +3.6V Transceiver Supply
o Low-Power Shutdown Current
Applications
o Small WLP Package (5.16mm x 3.66mm x 0.5mm)
802.16e Mobile WiMAX Systems
Ordering Information
Korean WiBro Systems
Proprietary Wireless Broadband Systems
802.11g or n WLAN with MRC or MIMO Down Link
PART
TEMP RANGE
PIN-PACKAGE
MAX2839ASEWO+T -40°C to +85°C
73 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
WiMAX is a trademark of the WiMAX Forum.
SPI is a trademark of Motorola, Inc.
Bump Configuration and 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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