_______________________________________________________________  Maxim Integrated Products    1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, 
or visit Maxims website at www.maxim-ic.com.
5GHz, 4-Channel MIMO Transmitter
19-5009; Rev 1; 3/10
                     Ordering Information
                      General Description
The MAX2850 is a single-chip, 4-channel RF transmitter 
IC designed for 5GHz wireless HDMI applications. The 
IC includes all circuitry required to implement the com-
plete 4-channel MIMO RF transmitter function and crys-
tal oscillator, providing a fully integrated transmit path, 
VCO, frequency synthesis, and baseband/control inter-
face. It includes a fast-settling, sigma-delta RF fractional 
synthesizer  with  76Hz  frequency  programming  step 
size. The IC also integrates on-chip I/Q amplitude and 
phase-error calibration circuits. Dynamic on/off control 
of four external PAs is implemented with programmable 
precision voltages. A 4-to-1 analog mux routes external 
PA power-detect voltages to the RSSI pin.
On-chip monolithic filters are included for transmitter I/Q 
baseband signal reconstruction to support both 20MHz 
and  40MHz  RF  channels.  The  baseband  filtering  and 
Tx signal paths are optimized to meet stringent WHDI 
requirements. The upconverter local oscillator is coher-
ent among all the transmitter channels.
The reverse-link control channel uses an on-chip 5GHz 
OFDM receiver. It shares the RF synthesizer and LO gen-
eration circuit with the MIMO transmitters. The receiver 
includes both an in-channel RSSI and an RF RSSI.
The MIMO transmitter chip is housed in a small, 68-pin 
thin QFN leadless plastic package with exposed pad.
                                 Applications
5GHz Wireless HDMI (WHDI)
5GHz FDD Backhaul and WiMax"
5GHz MIMO Transmitter Up to Four Spatial 
Streams
5GHz Beam Steering Transmitter
                                      Features
S    5GHz 4x MIMO Downlink Transmitters, Single 
Uplink IEEE 802.11a Receiver 
  4900MHz to 5900MHz Frequency Range
  -5dBm Transmit Power (54Mbps OFDM)
  Coherent LO Among Transmitters
  31dB Tx Gain-Control Range with 0.5dB Step
     Size, Digitally Controlled 
  Tx/Rx I/Q Error and LO Leakage Detection and
     Adjustment 
  Programmable 20MHz/40MHz Tx I/Q Lowpass 
     Anti-Aliasing Filter 
  4-to-1 Analog Mux for PA Power Detect
  4-Channel PA On/Off Control
  4.5dB Rx Noise Figure
  70dB Rx Gain-Control Range with 2dB Step
     Size, Digitally Controlled 
  60dB Dynamic Range Receiver RSSI
  RF Wideband Receiver RSSI
  Programmable 20MHz/40MHz Rx I/Q Lowpass
     Channel Filters 
  Sigma-Delta Fractional-N PLL with 76Hz
     Resolution 
  Monolithic Low-Noise VCO with -35dBc
     Integrated Phase Noise 
  4-Wire SPI"
 
Digital Interface
  I/Q Analog Baseband Interface
  Digital Tx/Rx Mode Control
  On-Chip Digital Temperature Sensor Readout
  Complete Baseband Interface
  Digital Tx/Rx Mode Control
S +2.7V to +3.6V Supply Voltage
S Small, 68-Pin Thin QFN Package (10mm x 10mm)
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
WiMax is a trademark of WiMax Forum. 
SPI is a trademark of Motorola, Inc.
Typical Operating Circuit appears at end of data sheet.
PART
TEMP RANGE
PIN-PACKAGE
MAX2850ITK+
-25NC to +85NC    68 Thin QFN-EP*