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Baseband unit (BBU)

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Block diagram

Baseband unit (BBU)

Block diagram

Overview

Our integrated circuits and reference designs help you create baseband units (BBUs) with signal integrity and low power while designing to 5G standards. Use the interactive system diagram below to design a system that is compatible with the latest processors/FPGAs and meets connectivity needs.

Design requirements

Modern BBU designs require:

  • Network synchronization over packet-based fronthaul interface.
  • Best-in-class signal integrity for ever-increasing data rates.
  • Highly-efficient power management for high ambient temperature environments.
Explore applications similar in function and design

Block diagram

Find products and reference designs for your system.

Baseband unit (BBU)

-48V -48V 25GE 25GE eCPRI/ CPRI eCPRI/CPRI SAS SAS M/LVDS M/LVDS CTRL CTRL PCI-E PCI-E Fan Control Fan Control eFuse eFuse Digital Isolator Digital Isolator MCU MCU Boost Boost I2C/SPI Functions I2C/SPI Functions Motor Drive Motor Drive Temp Sense Temp Sense Humidity Sense HumiditySense REF REF OPA OPA LED Control LED Control LED Driver LED Driver Shift Register Shift Register Logic Logic Timing Timing Clock Buffer Clock Buffer External CLK / GPS External CLK / GPS Logic Logic Network Synchronizer/ Jitter Cleaner Network Synchronizer/Jitter Cleaner TCXO/OCXO TCXO/OCXO DAC DAC OPA OPA Temp Sense Temp Sense Baseband and Radio Interface Baseband and Radio Interface FPGA / ASIC FPGA /ASIC Level Shift Level Shift Logic Logic Current Limited Switch or eFuse Current Limited Switchor eFuse I2C I/O Expander I2C I/O Expander I2C Switch I2C Switch Front Port Controller Front Port Controller CPU CPU SFP+/ QSFP SFP+/QSFP SFP+/ QSFP SFP+/QSFP SFP+/ QSFP SFP+/QSFP SFP+/ QSFP SFP+/QSFP SFP+/ QSFP SFP+/QSFP SFP+/ QSFP SFP+/QSFP Retimer Retimer I2C/SPI Functions I2C/SPI Functions Temp Sense Temp Sense Retimer / Redriver Retimer / Redriver Retimer / Redriver Retimer / Redriver Transport and Control Transport and Control RS-232 RS-232 Current Limit Switch Current Limit Switch USB Redriver/MUX USB Redriver/MUX I2C/SPI Functions I2C/SPI Functions SPI MUX SPIMUX DDR Memory DDR Memory Logic Logic Retimer / Redriver Retimer / Redriver Temp Sense Temp Sense INA INA CPU CPU LVDS/MLVDS Line Driver LVDS/MLVDS Line Driver Level Shift Level Shift Mini SAS Mini SAS USB Port Protector USB Port Protector SFP+/ QSFP SFP+/QSFP RS-485 RS-485 CAN CAN ESD ESD JTAG MUX JTAG MUX USB-C Port Control USB-CPort Control Flash Flash FPGA FPGA PCI-E Retimer PCI-E Retimer SAS Retimer SAS Retimer Ethernet Switch/PHY Ethernet Switch/PHY Retimer / Redriver Retimer / Redriver Sequencing & Monitoring Sequencing & Monitoring Sequencer Sequencer MCU MCU REF REF Comp Comp Logic Logic Reset Reset Monitoring Monitoring Load Switch Load Switch CPU & Memory Power (SVID & PMBus) CPU & Memory Power (SVID & PMBus) Multiphase Controller Multiphase Controller Power Stage Power Stage Converter Converter DDR Termination DDR Termination POL Power (FPGA, ASIC, Merchant Si, Clocks, etc.) POL Power (FPGA, ASIC, Merchant Si, Clocks, etc.) Converter Converter LDO LDO Multiphase Controller Multiphase Controller Power Stage Power Stage Module Module 12V Hot Swap & OR 12V Hot Swap & OR 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 Isolated Driver Isolated Driver Aux Bias Supply Aux Bias Supply Digital Isolator Digital Isolator Voltage Reference Voltage Reference V/I Sense V/I Sense Isolated I2C Isolated I2C Protection Protection Hot Swap Controller & Monitoring Hot Swap Controller& Monitoring Driver Driver FET FET FET FET ORing ORing

Sequencing & monitoring

close

Controls power sequencing for the entire system. They can either be implemented with the help of discrete logic gates or by using more integrated sequencer devices. Our advanced sequencer devices allow precise startup functionality and ensure proper startup of the other board subsystems.

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Power management (24)
Load switches
  • TPS22992—5.5V 6A 8.7mΩ load switch with adjustable rise time and adjustable output discharge
    Data sheet: PDF | HTML
  • TPS22810-Q1—Automotive 1-channel, 18-V, 2-A, 79-mΩ load switch with adj. rise time and adj. output discharge
    Data sheet: PDF | HTML
  • TPS22990—5.5-V, 10-A, 3.9-mΩ load switch with adj. rise time, power good and optional output discharge
    Data sheet: PDF | HTML
  • TPS22971—3.6-V, 3-A, 6.7-mΩ load switch with adj. rise time, power good, and output discharge
    Data sheet: PDF | HTML
  • TPS22954—5.7-V, 5-A, 14-mΩ load switch with adj. rise time, -Voltage monitoring and output discharge
    Data sheet: PDF | HTML
  • TPS22991—5V, 3A, 25mΩ load switch with optional output discharge
    Data sheet: PDF | HTML
Supervisor & reset ICs
  • TPS389006-Q1—Automotive multichannel overvoltage and undervoltage I²C programmable voltage supervisor and monitor
    Data sheet: PDF | HTML
  • TPS3897—Single-channel, ultra-small, adjustable supervisor with active-high, open-drain output
    Data sheet: PDF | HTML
  • TPS3808E—600nA ultra-low quiescent current supervisor with programmable delay and manual reset
    Data sheet: PDF | HTML
  • TPS3823—Active-low, push-pull, voltage supervisor (reset IC) with 1.6-s watchdog & manual reset
    Data sheet: PDF | HTML
  • TPS3106—Dual-channel, voltage supervisor, ultra-low supply current
    Data sheet: PDF | HTML
Shunt voltage references
  • TLV431B—0.5% accuracy, low-voltage, adjustable precision shunt regulator
    Data sheet: PDF | HTML
  • LM4041-N—Fixed & adjustable, 45-µA, precision micropower shunt voltage reference
    Data sheet: PDF | HTML
  • LM4040-N—100-ppm/°C precision micropower shunt voltage reference
    Data sheet: PDF | HTML
  • TLA431—All-capacitor stable precision programmable reference with KRA pin layout
    Data sheet: PDF | HTML
  • LMV431A—1%, low-voltage (1.24-V) adjustable precision shunt regulator
    Data sheet: PDF | HTML
  • TLV431A—1% accuracy, low-voltage, adjustable precision shunt regulator
    Data sheet: PDF | HTML
Series voltage references
  • REF35—650-nA quiescent current, 12-ppm/°C drift, ultra-low-power precision voltage reference
    Data sheet: PDF | HTML
Sequencers
  • UCD90160A—16-Rail PMBus Power Supply Sequencer and System Manager with ACPI Support
    Data sheet: PDF | HTML
  • LM3880-Q1—Automotive grade 3 rail simple power sequencer with fixed time delay
    Data sheet: PDF | HTML
  • UCD90320—32-Rail PMBus Power Sequencer and System Manager
    Data sheet: PDF | HTML
  • UCD90120A—12-Rail Power Supply Sequencer and Monitor with ACPI Support
    Data sheet: PDF | HTML
  • LM3880—3 Rail Simple Power Sequencer with Fixed Time Delay
    Data sheet: PDF | HTML
  • UCD9090—10-Channel Sequencer and System Health Monitor
    Data sheet: PDF | HTML
Amplifiers (10)
Digital power monitors
  • INA226—36V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert
    Data sheet: PDF | HTML
  • INA220—26V, 12-bit, i2c output current/voltage/power monitor
    Data sheet: PDF | HTML
  • INA233—36V, 16-bit, ultra-precise i2c & pmbus output current/voltage/power/energy monitor w/alert
    Data sheet: PDF | HTML
  • INA219—26-V 12-bit I2C output digital power monitor
    Data sheet: PDF | HTML
Comparators
  • LM2903B—Dual industrial grade standard comparator
    Data sheet: PDF | HTML
  • TLV1821—Single-channel micropower high-voltage comparator with open-drain output
    Data sheet: PDF | HTML
  • LM2903—Dual differential comparator
    Data sheet: PDF | HTML
  • TLV3511—6ns push-pull comparator with rail-to-rail inputs
    Data sheet: PDF | HTML
  • TL331—High Voltage Single Differential Comparator
    Data sheet: PDF | HTML
  • TL331-EP—Enhanced Product Single Differential Comparator
    Data sheet: PDF | HTML
Microcontrollers (MCUs) & processors (1)
MSP430 microcontrollers
  • MSP430F5529—25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier
    Data sheet: PDF | HTML
  • PMP10896—Complete PMBus Power System for Enterprise Ethernet Switches Reference Design
    Test report: PDF Schematic: PDF
  • PMP11399—PMBus Power System for Enterprise Ethernet Switches Reference Design
    Test report: PDF Schematic: PDF

Technical documentation

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Type Title Date
Technical article How to achieve network synchronization clocks with TI digital PLLs PDF | HTML 26 Jun 2023
Application note LVDS Multidrop Connections (Rev. A) 26 Feb 2002
White paper Maximizing Multicore Efficiency with Navigator Runtime 23 Feb 2012
White paper KeyStone Memory Architecture White Paper (Rev. A) 21 Dec 2010
White paper Design considerations of GaN devices for improving power converter efficiency 20 Nov 2017
Technical article Is it science fiction or 5G? PDF | HTML 19 Sep 2023
Product overview TMS320C6671/72/74/78 High-Performance Multicore Fixed- and Floating-Point DSPs (Rev. B) 19 Apr 2011
Technical article Stack current with PowerStack packages for higher power POL PDF | HTML 18 Aug 2023
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 17 Oct 2022
Application note CDCE62005 Phase Noise and Jitter Cleaning Performance 17 Nov 2008
Application note Optimizing Layout of the TPS54824 HotRod™ Package for Thermal Performance 16 Nov 2018
White paper Overcurrent protection enables more efficient and reliable systems 16 May 2016
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 Differential Signaling (LVDS) Design Notes (Rev. A) 11 Oct 2000
Application note Enhancing the Computational Performance of the C2000™ Microcontroller Family (Rev. C) PDF | HTML 10 May 2022
Product overview TMS320TCI6618: Doubling performance for 4G wireless base stations 10 Feb 2011
Application note ITU-T G.8262 Compliance Test Results for the LMK05028 Digital PLL Network 10 Apr 2018
Analog Design Journal Understanding thermal-resistance specification of DC/DC convert. w/ MOSFETs 08 Jan 2018
Product overview TMS320TCI6616 Breakthrough Performance for Wireless Base Stations 04 Nov 2010

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