Macro remote radio unit (RRU)

Products and reference designs

Macro remote radio unit (RRU)

Block diagram

Overview

Integrated circuits and reference designs help you create macro remote radio units (RRUs) that connect people and devices with higher bandwidth. Our modern radio frequency (RF) sampling radio or intermediate frequency (IF) sampling architectures enable direct, high-speed data conversion while our companion power and clocking products meet the latest 5G requirements.

Design requirements

Modern macro RRUs require:

  • Highly integrated analog front end with wider bandwidth and multi-frequency operation.
  • High-density power management operating at high ambient temperature.
  • Network synchronization over packet-based fronthaul interface.

Explore applications similar in function and design

Block diagram

Find products and reference designs for your system.

RRU IF Sampling

Isolated -48V DC/DC power supply Isolated -48V DC/DC power supply PWM controller PWM controller High/low side driver High/low side driver FET FET FET FET SyncFET driver SyncFET driver Isolateddriver Isolateddriver Aux bias supply Aux bias supply Digital isolator Digital isolator Voltage Reference Voltage Reference Current sense Current sense eCPRI (from BBU) eCPRI(from BBU) COM Port COM Port Fan / AC Fan / AC T1/E1 T1/E1 TXa RXa TXaRXa TXn RXn TXnRXn GPS Clock GPS Clock . . . ... eCPRI RX clock eCPRI RX clock Analog front end (AFE) power Analog front end (AFE) power DC/DC converter DC/DC converter Load switch Load switch LDO LDO Multi-channel converter Multi-channel converter Multi-channel LDO Multi-channel LDO Point of load (POL) power Point of load (POL) power DC/DC controller DC/DC controller FET FET DC/DC converter DC/DC converter LDO LDO Sequencer Sequencer Power amplifier (PA) power Power amplifier (PA) power DC/DC controller DC/DC controller FET FET DC/DC converter DC/DC converter LDO LDO Clocking conditioner/synchronizer Clocking conditioner/synchronizer TCXO OCXO TCXOOCXO Network synchronizer/ jitter cleaner Network synchronizer/ jitter cleaner Clock buffer Clock buffer Communication Communication RS-485 RS-485 RS-232 RS-232 Ethernet PHY Ethernet PHY Digital front end (DFE) Digital front end (DFE) ARM ARM ASIC / FPGA ASIC / FPGA Glue logic Glue logic Voltage translation Voltage translation I/O expander I/O expander Logic gates Logic gates Supervisor & reset control Supervisor & reset control AISG interface AISG interface Digital potentiometer Digital potentiometer On/off keying (OOK) On/off keying (OOK) RS-485 RS-485 Protection Protection Hot swap controller Hot swap controller Driver Driver FET FET FET FET Optical Optical Optical module Optical module Current limit switch Current limit switch Retimer Retimer RF front end and power amplifier RF front end and power amplifier PA Module PA Module Filter Filter Filter Filter Filter Filter LNA LNA Duplexer Duplexer OPA OPA eFuse eFuse Current sense Current sense Analog monitor & control Analog monitor & control Temp sense Temp sense Switch Switch Filter Filter Switch Switch RF synthesizer (LO) RF synthesizer (LO) RF power detector RF power detector “nTX/nRX” antenna configuration “nTX/nRX” antenna configuration DVGA DVGA DVGA DVGA DVGA DVGA IF sampling analog front end IF sampling analog front end AFE AFE Memory Memory DDR DDR Flash Flash

Isolated -48-V DC/DC power supply

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Isolated power supplies utilize transformers to provide input to output isolation, such that dangerous voltages do not pass. The isolated power supply generates the intermediate bus voltage (i.e. 12V) which then serves as the input to the downstream non-isolated converters. Additional isolated supplies can also be used to generate higher voltages to the power amplifiers and also for generating lower voltages for lower power rails (i.e. 5V).

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Amplifiers (4)
Analog current-sense amplifiers
  • INA2290Dual-channel, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier
    Data sheet: PDF | HTML
  • INA281-4-V to 110-V, 1.3-MHz, high-precision current sense amplifier
    Data sheet: PDF | HTML
  • INA310A-4-V to 110-V, 1.3-MHz, ultra-precise current-sense amplifier with comparator
    Data sheet: PDF | HTML
  • INA296B-5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier
    Data sheet: PDF | HTML
Power management (35)
Isolated gate drivers
  • UCC21231High-speed dual-channel isolated gate driver with 4A source and 6A sink
    Data sheet: PDF | HTML
  • UCC21225A2.5kVrms, 4A/6A dual-channel isolated gate driver with dual input, 5V UVLO & LGA package
    Data sheet: PDF | HTML
Low-side drivers
  • UCC2761410-A/10-A single-channel gate driver with 4-V UVLO, 30-V VDD and low prop delay
    Data sheet: PDF | HTML
  • UCC275245-A/5-A dual-channel gate driver with 5-V UVLO, enable, and 1-ns delay Matching
    Data sheet: PDF | HTML
  • LM51147.6-A/1.3-A single channel gate driver with 4-V UVLO and split outputs
    Data sheet: PDF | HTML
  • UCC275124-A/8-A single-channel gate driver with 5-V UVLO and split outputs in SON package
    Data sheet: PDF | HTML
  • UCC27324Non-inverting 4-A/4-A dual-channel low side gate driver
    Data sheet: PDF | HTML
  • UCC275114-A/8-A single-channel gate driver with 5-V UVLO, split outputs, and 13-ns Prop delay
    Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)
  • UCD3138128AHighly-Integrated Digital Controller For Isolated Power
    Data sheet: PDF | HTML
  • LM5045Full-bridge PWM controller with Integrated MOSFET Drivers
    Data sheet: PDF | HTML
  • UCC2897A110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection
    Data sheet: PDF | HTML
  • UCD9248Digital PWM system controller
    Data sheet: PDF | HTML
  • UCD3138Highly Integrated Digital Controller for Isolated Power with 3 Feedback Loops and 8 DPWM Outputs
    Data sheet: PDF | HTML
  • UCD3138064Highly-Integrated Digital Controller for Isolated Power with 64kB Memory
    Data sheet: PDF | HTML
Shunt voltage references
  • TLV431B0.5% accuracy, low-voltage, adjustable precision shunt regulator
    Data sheet: PDF | HTML
  • TLV431A1% accuracy, low-voltage, adjustable precision shunt regulator
    Data sheet: PDF | HTML
  • TLA431All-capacitor stable precision programmable reference with KRA pin layout
    Data sheet: PDF | HTML
  • TLA432All-capacitor stable precision programmable reference with RKA pin layout
    Data sheet: PDF | HTML
  • TLVH431A1% low-voltage wide-operating current adjustable precision shunt regulator
    Data sheet: PDF | HTML
  • LM4041D121.2-V precision micropower shunt voltage reference with 1% accuracy
    Data sheet: PDF | HTML
Half-bridge drivers
  • UCC272013-A, 120-V half bridge gate driver with 8-V UVLO and TTL inputs
    Data sheet: PDF | HTML
  • TPS282254-A, 27-V half bridge gate driver with 4-V UVLO for synchronous rectification
    Data sheet: PDF | HTML
  • UCC27211A4-A, 120-V half bridge gate driver with 8-V UVLO and negative voltage handling
    Data sheet: PDF | HTML
  • UCC272823-A, 120-V half-bridge gate driver with 5-V UVLO, interlock and enable
    Data sheet: PDF | HTML
  • LMG12101.5-A, 3-A, 200-V half bridge gate driver, 5-V UVLO and programmable dead-time for GaNFET and MOSFET
    Data sheet: PDF | HTML
  • UCC272843-A, 120-V half bridge gate driver with 5-V UVLO and enable
    Data sheet: PDF | HTML
MOSFETs
  • CSD19533Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.5 mOhm
    Data sheet: PDF | HTML
  • CSD17578Q5A30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.3 mOhm
    Data sheet: PDF | HTML
  • CSD17573Q5B30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 1.45 mOhm
    Data sheet: PDF | HTML
  • CSD17577Q3A30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 6.4 mOhm
    Data sheet: PDF | HTML
  • CSD17576Q5B30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.9 mOhm
    Data sheet: PDF | HTML
  • CSD17581Q3A30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 4.7 mOhm
    Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)
  • LM51696V to 120V Wide VIN, 650-mA DC/DC converter with Fly-Buck™ capability
    Data sheet: PDF | HTML
  • LM51686-V to 120-V wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability
    Data sheet: PDF | HTML
  • LM51646-V to 100-V input, 1-A synchronous buck DC-DC converter with ultra-low IQ
    Data sheet: PDF | HTML
Isolation (4)
Digital isolators
  • ISO7731Robust EMC, triple-channel, 2/1, reinforced digital isolator
    Data sheet: PDF | HTML
  • ISO7710Robust EMC, single-channel, reinforced digital isolator
    Data sheet: PDF | HTML
  • ISO7220MDual-channel, 2/0, 150-Mbps digital isolator
    Data sheet: PDF | HTML
  • ISO7720Robust EMC, dual-channel, 2/0, reinforced digital isolator
    Data sheet: PDF | HTML
  • PMP1039518-60VDCin, 6V/31A Active Clamp Forward Reference Design
    Test report: PDF Schematic: PDF
  • PMP2074236V-60V Input 12V/5A Highly Efficient Active Clamp Forward Reference Design
    Test report: PDF Schematic: PDF
  • PMP208503.3V/15A Active Clamp Forward Reference Design
    Test report: PDF Schematic: PDF
  • PMP21254160-A, four-phase reference design with integrated FET controller
    Test report: PDF | HTML Schematic: PDF
  • PMP23470750 kHz flyback converter for 48V systems reference design
    Test report: PDF | HTML Schematic: PDF
  • PMP316236V-72Vdc Input, 12V/200W Active Clamp Forward - Reference Design
    Test report: PDF Schematic: PDF
  • PMP4320A600W Half Brick DC/DC Converter with Digital Control for Telecom Applications Reference Design
    Test report: PDF Schematic: PDF
  • PMP43331kW Triple-Rail Isolated DC/DC Digital Power Supply for Telecom (-8V@0.25A) Reference Design
    Test report: PDF Schematic: PDF
  • PMP443548Vin, 300W 1/8brick Digital Module with GaN FET Reference Design
    Test report: PDF Schematic: PDF
  • PMP448648Vin Digital POL with 3 Outputs Reference Design
    Test report: PDF Schematic: PDF
  • PMP4497LMG5200 48V to 1V/40A Single Stage Converter Reference Design
    Test report: PDF Test report: PDF Schematic: PDF
  • PMP745136V-75VDC Input, 12V/10A Active Clamp Forward, 1/8th Brick Reference Design
    Test report: PDF Schematic: PDF
  • PMP8790Active Clamp Forward Quarter Brick (18 to 60Vdc Input 3.3V/12A) Reference Design
    Test report: PDF Schematic: PDF
  • PMP886118-72VDC Input, 12V/120W Active Clamp Forward Reference Design
    Test report: PDF Schematic: PDF
  • PMP88771/8 Brick Isolated DC/DC Telecom Power Module Digital Control Reference Design
    Test report: PDF Schematic: PDF
  • PMP897318Vdc-60Vdc Input, 3.3V/15A Active Clamp Forward, 1/8 Brick Reference Design
    Test report: PDF Schematic: PDF
  • PMP912636 to 75VDC Input 5V/15A Active Clamp Forward 1/8 Brick Form Factor Reference Design
    Test report: PDF Schematic: PDF
  • TIDA-050022Power stage reference design for <100-VIN DC/DC converters
    Design guide: PDF Schematic: PDF

Technical documentation

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Type Title Date
Application note Base Station Closed-Loop RF Pwr Cntrl w/LMV232 Crest-Factor Invariant Detector (Rev. A) 30 Apr 2013
Application note AN-1434 Crest Factor Invariant RF Power Detector (Rev. A) 30 Apr 2013
Technical article Are you ready for BAW? PDF | HTML 29 Jun 2023
Application note Dither Improves ACPR in RF Sampling DAC 24 Oct 2018
Application note Protecting Radio, Baseband and Active Antenna Systems with TPS2352x Hot Swaps 24 Aug 2018
White paper 準備好迎接 5G 世界: 使用技術與硬體需求概論 22 Feb 2019
Application note LMK0461x Phase Noise Performance With DC-DC Converters (Rev. B) 20 Jul 2017
Technical article Is it science fiction or 5G? PDF | HTML 19 Sep 2023
White paper Preparing for a 5G world: An overview of the enabling technologies and hardware 17 Dec 2018
Application note AFE768x Power Dissipation Comparison across Modes 17 Aug 2018
Application note Optimizing Layout of the TPS54824 HotRod™ Package for Thermal Performance 16 Nov 2018
Application note JESD204B Multi-Device Synchronization Using LMK0461x 16 Aug 2017
Analog Design Journal JESD204B multi-device synchronization: Breaking down the requirements 12 May 2015
White paper Analog advancements make waves in 5G communications 12 Aug 2016
Application note TI Network Synchronizer Clock Value Adds in Communications and Industrial Applic 12 Apr 2018
Application note Low Voltage Translation for SPI, UART, RGMII, JTAG Interfaces (Rev. B) PDF | HTML 11 May 2022
Application note Powering the AFE7920 with the TPS62913 Low-Ripple and Low-Noise Buck Converter (Rev. A) PDF | HTML 11 May 2022
Application note MIMO Transceiver with AFE76xx for LTE and 5G Wireless Radio (Rev. A) 10 May 2022
Application note Clocking Optimization for RF Sampling Analog-to-Digital Converters (Rev. A) PDF | HTML 10 May 2022
Application note An Efficient LDO-less Power Supply Solution for AFE76xx 10 Aug 2018
Application note Spurs Analysis in the RF Sampling ADC 09 Feb 2018
Application note RF Sampling ADC with 800MHz of IBW LTE 08 Sep 2016
White paper Internally compensated advanced current mode (ACM) (Rev. A) 07 Dec 2018
White paper Direct RF conversion: From vision to reality 05 May 2015
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 05 Feb 2019
Application note AFE76xx as a Single-Chip Wideband Repeater Using Loopback Mode 01 Nov 2018

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