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MAX2850
5GHz, 4-Channel MIMO Transmitter
General Description
Features
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 crystal
oscillator, providing a fully integrated transmit path, VCO,
frequency synthesis, and baseband/control interface.
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.
● 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
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 coherent
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.
• 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
The MIMO transmitter chip is housed in a small, 68-pin
thin QFN leadless plastic package with exposed pad.
• On-Chip Digital Temperature Sensor Readout
• Complete Baseband Interface
• Digital Tx/Rx Mode Control
Applications
● 5GHz Wireless HDMI (WHDI)
● 5GHz FDD Backhaul and WiMax™
● 5GHz MIMO Transmitter Up to Four Spatial Streams
● 5GHz Beam Steering Transmitter
● +2.7V to +3.6V Supply Voltage
● Small, 68-Pin Thin QFN Package (10mm x 10mm)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2850ITK+
*EP = Exposed pad.
-25°C to +85°C
68 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit appears at end of data sheet.
WiMax is a trademark of WiMax Forum.
SPI is a trademark of Motorola, Inc.
19-5009; Rev 2; 1/19