SNLS544B September   2016  – October 2019 DS280BR820

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Electrical Characteristics – Serial Management Bus Interface
    7. 6.7 Timing Requirements – Serial Management Bus Interface
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Device Data Path Operation
      2. 7.3.2 AC-Coupled Receiver Inputs
      3. 7.3.3 Signal Detect
      4. 7.3.4 2-Stage CTLE
      5. 7.3.5 Driver DC Gain Control
      6. 7.3.6 FIR Filter (Limiting Mode)
      7. 7.3.7 Configurable SMBus Address
    4. 7.4 Device Functional Modes
      1. 7.4.1 SMBus Slave Mode Configuration
      2. 7.4.2 SMBus Master Mode Configuration (EEPROM Self Load)
    5. 7.5 Programming
      1. 7.5.1 Transfer of Data with the SMBus Interface
    6. 7.6 Register Maps
      1. 7.6.1 Register Types: Global, Shared, and Channel
      2. 7.6.2 Global Registers: Channel Selection and ID Information
        1. Table 2. Global Register Map
      3. 7.6.3 Shared Registers
        1. Table 3. Shared Register Map
      4. 7.6.4 Channel Registers
        1. Table 4. Channel Register Map
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Backplane and Mid-Plane Reach Extension
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
      2. 8.2.2 Front-Port Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
        1. 8.2.3.1 Pattern Generator Characteristics
        2. 8.2.3.2 Equalizing Moderate Pre-Channel Loss
        3. 8.2.3.3 Equalizing High Pre-Channel Loss
        4. 8.2.3.4 Equalizing High Pre-Channel Loss and Moderate Post-Channel Loss
        5. 8.2.3.5 Output in FIR Limiting Mode with 16T Pattern
    3. 8.3 Initialization Set Up
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
      1. 10.2.1 Stripline Example
      2. 10.2.2 Microstrip Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.3.4 Equalizing High Pre-Channel Loss and Moderate Post-Channel Loss

This example application result demonstrates the DS280BR820 equalizing for pre-channel and post-channel insertion loss introduced by FR4 channels.

DS280BR820 AppData_preChan_postChan.gifFigure 24. 10 in Input Channel and 5 in Output Channel Test Setup
DS280BR820 AppData_pre10in_post5in_25G.gifFigure 25. 25.78125 Gbps Eye Diagram with 10 in Input Channel and 5 in Output Channel, Linear Mode
DS280BR820 AppData_pre10in_post5in_10G.gifFigure 27. 10.1325 Gbps nPPI Eye Mask with 10 in Input Channel and 5 in Output Channel, Linear Mode
DS280BR820 AppData_pre10in_post5in_25G_FIR.gifFigure 26. 25.78125 Gbps CAUI-4 Eye Mask with 10 in Input Channel and 5 in Output Channel, FIR Limiting Mode

Table 8. Settings and Measurements for CAUI-4 and nPPI with 10 in Input Channel and 5 in Output Channel

25.78125 Gbps (CAUI-4) 25.78125 Gbps (CAUI-4) 10.3125 Gbps (nPPI)
Transmission Line 1 10 in 5 mil FR4 + 8 in SMA cable 10 in 5 mil FR4 + 8 in SMA cable 10 in 5 mil FR4 + 8 in SMA cable
Transmission Line 2 5 in 5 mil FR4 + 8 in SMA cable 5 in 5 mil FR4 + 8 in SMA cable 5 in 5 mil FR4 + 8 in SMA cable
DS280BR820 Rx Channel Loss 22 dB @ 12.9 GHz 22 dB @ 12.9 GHz 10 dB @ 5.2 GHz
DS280BR820 Tx Channel Loss 14.5 dB @ 12.9 GHz 14.5 dB @ 12.9 GHz 6 dB @ 5.2 GHz
EQ BST1 7 7 7
EQ BST2 7 7 7
EQ BW 3 3 3
VOD 3 3 2
EQ DC Gain Mode Low Low Low
Tx Mode Linear FIR Limiting Linear
Tx Main-Cursor N/A 16 N/A
Tx Pre-Cursor N/A 5 N/A
Tx Post-Cursor N/A 10 N/A
Total Jitter @ 1E-15 14.8 psP-P 14.8 psP-P 17.0 psP-P
Differential Eye Height @ 1E-15 67 mVP-P 118 mVP-P 407 mVP-P
Mask violations N/A 0 0