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5GHz, 4-Channel MIMO Transmitter

High-Performing, Cost-Effective RF Design for Wireless HD Video (WHDI) Enabling Longer Range and Better Video Reception

Product Details

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 complete 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.

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 generation 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.

Key Features

  • 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
  • +2.7V to +3.6V Supply Voltage
  • Small, 68-Pin Thin QFN Package (10mm x 10mm)

Applications/Uses

  • 5GHz Beam Steering Transmitter
  • 5GHz FDD Backhaul and WiMax™
  • 5GHz MIMO Transmitter Up to Four Spatial Streams
  • 5GHz Wireless HDMI (WHDI)
Parametric specs for RF Transceivers > 1GHz
Duplex Method OFDM
Frequency Range (MHz) 4900 to 5875
Inputs 1 Rx
Outputs 4 Tx
Tx OIP3 Power (dBm) (max) -5
Rx Noise Figure (dB) 4.5
Package/Pins TQFN/68
Budgetary
Price (See Notes)
$10.50 @1k
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Technical Docs

Design & Development

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Description

The MAX2850 evaluation kit (EV kit) simplifies testing of the MAX2850’s receive and transmit performance in 802.11a applications operating in the 4.9GHz to 5.9GHz ISM band. The EV kit provides 50Ω SMA connectors for all RF and baseband inputs and outputs. Differential-to-single- ended and single-ended-to-differential line drivers are provided to convert the differential I/Q baseband inputs and outputs to single-ended.

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Features

  • On-Board Line Driver and Voltage Reference
  • 50Ω SMA Connectors on All RF and Baseband Ports
  • PC Control Software Available at www.maximintegrated.com

/en/design/design-tools/ee-sim.html?

SIMULATION MODELS

MAX2850 IBIS Model

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Parameters

Parametric specs for RF Transceivers > 1GHz
Duplex Method OFDM
Frequency Range (MHz) 4900 to 5875
Inputs 1 Rx
Outputs 4 Tx
Tx OIP3 Power (dBm) (max) -5
Rx Noise Figure (dB) 4.5
Package/Pins TQFN/68
Budgetary
Price (See Notes)
$10.50 @1k

Key Features

  • 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
  • +2.7V to +3.6V Supply Voltage
  • Small, 68-Pin Thin QFN Package (10mm x 10mm)

Applications/Uses

  • 5GHz Beam Steering Transmitter
  • 5GHz FDD Backhaul and WiMax™
  • 5GHz MIMO Transmitter Up to Four Spatial Streams
  • 5GHz Wireless HDMI (WHDI)

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 complete 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.

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 generation 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.

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.