Communications Infrastructure

National Communication Infrastructure Solutions

National's energy-efficient products address the critical needs of communications infrastructure systems— wireless basestations, wired data centers, and merchant power supply applications—by combining high performance solutions with easy-to-use online design tools and comprehensive reference designs. National’s Energy-Efficient Products:

• Reduce cost by increasing efficiency and lowering the total cost of ownership over the product’s lifetime
• Reduce size by decreasing the overall footprint and minimizing the heat generated by power losses
• Provide reliability by protecting overall system health

By Application

• Base Station (BTS) Solutions
• System Monitoring & Control

By Product Type

Power Management Home

• SIMPLE SWITCHER® Solutions
  • DC-DC Modules
  • Regulators
  • Controllers
  • Boost/Flyback/SEPIC
• By Topology
  • Buck Converters (Step Down)
  • Boost Converters (Step Up)
  • Buck-Boost, Inverting
• Isolated Topologies (100W to 1000W)
  • Flyback, Forward Converter
  • Half Bridge, Push-Pull, Full Bridge
  • MOSFET Drivers
• Power for Altera / Xilinx FPGAs
• Multi-Output Regulators
• LDOs/Linear
• High Voltage (≥42V) Switching Converters
• Hot Swap Controllers
• System Protection & Management
• Power over Ethernet (PoE)
• Voltage References
• Power Management Units (PMUs)
• Load Share Controllers
• PowerWise® AVS

Amplifiers Home

• Differential Amps
• RF Power Detectors
• Variable Gain Amps
• Low Noise Op Amps
• Precision Op Amps
• Comparators

Data Conversion Home

• Gigasample GSPS ADCs
• High-Speed MSPS ADCs
• Precision kSPS ADCs
• Precision DACs

Interface Home

• LVDS & CML (Buffers, Signal Conditioning)
• Serializers/Deserializers (SerDes)
• SDI / Broadcast Video
• Ethernet
• System Test Access (IEEE 1149 JTAG)

Clock & Timing

• Jitter Cleaners Devices with Clock Distribution
• PLL Frequency Synthesizers

LED Lighting

Temperature Sensors

Featured Products

• LM27402 - High Performance Synchronous Buck Controller with DCR Current Sensing
• LMZ-Series SIMPLE SWITCHER® Power Modules
• LM25066 - System Power Management and Protection IC with PMBus
• LM5035C - PWM Controller with Integrated Half-Bridge and SyncFET Drivers
• LM5039 - Half-Bridge PWM Controller with Advanced Current Limit
• LM3753 / LM3754 - Scalable 2-Phase Synchronous Buck Controllers with Integrated FET Drivers and Linear Regulator Controller
• LM96080 - System Hardware Monitor with 2-Wire Serial Interface
• PowerWise® AVS Technology - Closed loop optimization technology reduces active and standby energy consumption of digital processors, ASICs, and SoCs by as much as 60% (overview video)
• ADC16DV160 - Dual 16-bit, 160 MSPS ADC with industry leading dynamic performance and smallest footprint
• LMH6517 - 1.2 GHz, low power dual DVGA; drives National’s high speed 16-bit ADCs – needs parametric data
• LMX2541 - High Performance Frequency Synthesizer System with Integrated VCO
• LMK04xxx - Precision Clock Conditioners Low-Noise Clock Jitter Cleaner with Cascaded PLLs

Reference Designs

• Powering the SignalPath: An isolated, low noise, split rail generator
• Low IF Receiver Design for multicarrier radios
• IEEE 1588 Clock Synchronization
• ATCA clock distribution over M-LVDS
• High IF Receiver Design

Design Information

• Signal Conditioning for Backplane
• An Introduction to M-LVDS, Clock and Data Distribution Applications
• Designing an ATCA Compliant M-LVDS Clock Distribution Network
• Hot Swap Applications: Featuring the LM5069 Hot Swap Controller
• DP83640 IEEE 1588 PTP Synchronized Clock Output
• Feedback Techniques for Crossing the Isolation Boundary
• High Voltage Switching Power Supply Topologies and Power Management ICs
• Power Supply Design for Power over Ethernet

Reference Designs (All)

• Quarter-Brick High Voltage, 3.3V, 30A Power Supply Reference Design
  • Features the LM5035C pulse-width modulation (PWM) controller and Silicon Labs' Si8420 ISOpro™ digital isolator
  • Demonstrates a viable 36V to 75V input half-bridge converter
• High-IF Sub-sampling Receiver Subsystem with Dual 16-bit 160 MSPS ADC16DV160, LMH6517, LMK04031B
  • Small-signal SNR of 72.7 dBFS and SFDR greater than 92 dBFS
  • Large-signal SNR of 71 dBFS and SFDR greater than 80 dBFS
• Low IF Receiver System with 16-bit 130 MSPS ADC16V130, LMK04031B, LP5900, LP3878
  • Small-signal (-20 dBFS) SNR of 78 dBFS and SFDR > 94 dBFS
  • Large-signal (-1 dBFS) SNR of 75.8 dBFS and SFDR > 84 dBFS
  • Total integrated jitter < 250 fs
• High IF Receiver System with 14-bit 155 MSPS ADC14V155, LMH6515, LMK03001C
  • Reference design performance for a 169 MHz input signal
  • Small-signal SNR of 72 dBFS and SFDR > 90 dBFS
  • Large-signal SNR 68.3 dBFS and SFDR of 77 dBFS
• Low IF Receiver System with Dual 14-bit 105 MSPS ADC14DS105, LMH6552, LMK02000
  • Reference design performance for input signals up to 40 MHz
  • Small-signal SNR of 74 dBFS and SFDR greater than 90 dBFS
  • Large-signal SNR of 73.3 dBFS and SFDR greater than 85 dBFS
• Clock Distribution on ATCA backplane - DS91D176EVK Evaluation Kit has ATCA connector and includes multiple M-LVDS transceivers. User can select stub lengths from .25 to 2 inches and trace characteristic impedance from 80 to 130 ohms.
  • AN-1503 - Designing an ATCA compliant Clock Distribution Network
• DP83640 10/100 Ethernet with IEEE 1588 PTP Support and Sub-10ns Timing

Design Information

Signal Path

• Signal-Path Designer® #111 - Selecting Amplifiers, ADCs, and Clocks for High-Performance (PDF)
• Signal-Path Designer #110 - Extending the Signal Path Over Data Transmission Lines (PDF)
• Signal-Path Designer® #107 - Delay Calibration of Signal Path Interconnect (PDF)
• AN-1558 - Clocking High-Speed A/D Converters
• AN-1704 - High-Speed ADC Input Driver
• AN-1716 - Driving High-Speed ADCs
• AN-1718 - Diff Amp Apps Up to 400 MHz
• AN-1719 - Noise Analysis - Fully Differential Amp
• AN-1950 - Silently Powering Low-Noise Applications

Clock & Timing

• AN-1721 - High-Speed ADCs - Interfacing, Driving, and Clocking
• AN-1926 - Introduction to M-LVDS and Clock and Data Distribution Applications
• AN-1503 - Designing an ATCA Compliant M-LVDS Clock Distribution Network
• Challenges of clocking a high-definition world (Part 1 / Part 2)
• AN-1910 - LMK04000 Family Phase Noise Characterization
• AN-1879 - Designing a fractional N PLL
• AN-1173 - High-Speed Bus LVDS Clock Distribution Using the DS92CK16 Clock Distribution

Interface

• AN-1881 - Improving Electromagnetic Noise Immunity in Serial Communications Systems
• Signal-Path Designer #110 - Extending the Signal Path Over Data Transmission Lines (PDF)
• Signal-Path Designer® #107 - Delay Calibration of Signal Path Interconnect (PDF)
• AN-1821 - CPRI Repeater System
• AN-1729 - DP83640 IEEE 1588 PTP Synchronized Clock Output
• AN-1541 - Driving Signals Over XAUI Backplanes Using DS42MB100/B200/BR400
• AN-1399 - Enabling Redundancy in Multi-Gigabit Links with DS40MB200
• AN-1398 - PCB Design Techniques for DS40MB200
• AN-1389 - Setting Pre-Emphasis Level for DS40MB200 4Gb/s Mux/Buffer
• AN-1887 - Expanding the Payload with National’s FPGA-Link

Power Management

• Gate-Drive Transformers vs. Fully Integrated Isolators in Isolated DC-DC Power Converters (article)
• Power Designer #124 - Isolated Supply Overview and Design Trade-Offs
• AN-1950 - Silently Powering Low-Noise Applications
• Buck Regulator Topologies for Wide Input/Output Voltage Differentials
• Overcoming Challenges in Designing Step Down Regulator Applications with >40V of Input Voltage
• Best Layout Practices for Switching Power Supplies
• Advanced Topics in Powering FPGAs
• Power Supply Design Considerations for Modern FPGAs
• Power Management Considerations for FPGAs and ASICs
• Power Supply Design for Power over Ethernet Applications
• Analyzing Power Modules
• Operation and Benefits of Active-Clamp Forward Power Converters
• Inside Current Mode Control
• Feedback Techniques for Crossing the Isolation Boundary
• Communications System Power Supply Designs
• Power Supply Design and the Thinking Engineer
• Comparing Topologies and the Design Rules of the Game
• Communications System Power Supply Designs
• Power Supply Design Using WEBENCH Tools
• Power Supply Design Techniques for FPGAs

System Monitoring & Reconfiguration

• AN-1984 - LM57 Temperature Switch vs Thermistors
• JTAG Advanced Capabilities and System Design
• Multiple Remote Diode Temperature Sensing
• Tiny Temperature Sensors for Remote Systems
• Thermal Management for High Performance Processor Systems
• AN-1262 - Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor
• AN-1340 - Simplified Programming of Xilinx Devices Using a SCANSTA111/112 JTAG Chain Mux
• AN-1327 - Simplified Programming of Altera FPGA's using a SCANSTA111/112 Scan Chain Mux

• Application Notes
• Evaluation Boards
• Models & Software
• Packaging
• Reference Designs
• Solutions for Altera FPGAs
• Solutions for Xilinx FPGAs
• Technical Support
• WEBENCH Design Tools

David introduces National's LM5035C & LM5039 half-bridge PWM controllers enable higher density and more intelligent isolated power supplies.

• LM5035C - PWM Controller with Integrated Half-Bridge and SyncFET Drivers
• LM5039 - Half-Bridge PWM Controller with Advanced Current Limit