SLASE67A January   2015  – August 2019 ADS54J54

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: 250 MSPS Output, 2x Decimation Filter
    7. 6.7  Electrical Characteristics: 500 MSPS Output
    8. 6.8  Electrical Characteristics: Sample Clock Timing Characteristics
    9. 6.9  Electrical Characteristics: Digital Outputs
    10. 6.10 Timing Requirements
    11. 6.11 Reset Timing
    12. 6.12 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  Decimation by 2 (250 MSPS Output)
      2. 7.3.2  Over-Range Indication
      3. 7.3.3  JESD204B Interface
        1. 7.3.3.1 JESD204B Initial Lane Alignment (ILA)
        2. 7.3.3.2 JESD204B Test Patterns
        3. 7.3.3.3 JESD204B Frame Assembly
      4. 7.3.4  SYSREF Clocking Schemes
      5. 7.3.5  Split-Mode Operation
      6. 7.3.6  Eye Diagram Information
      7. 7.3.7  Analog Inputs
      8. 7.3.8  Clock Inputs
      9. 7.3.9  Input Clock Divider
      10. 7.3.10 Power-Down Control
      11. 7.3.11 Device Configuration
      12. 7.3.12 JESD204B Interface Initialization Sequence
      13. 7.3.13 Device and Register Initialization
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Modes
      2. 7.4.2 Output Format
    5. 7.5 Programming
      1. 7.5.1 Serial Register Write
      2. 7.5.2 Serial Register Readout
    6. 7.6 Register Maps
      1. 7.6.1 Register Descriptions
        1. 7.6.1.1  Register Address 0
          1. Table 9. Register Address 0 Field Descriptions
        2. 7.6.1.2  Register Address 1
          1. Table 10. Register Address 1 Field Descriptions
        3. 7.6.1.3  Register Address 3
          1. Table 11. Register Address 3 Field Descriptions
        4. 7.6.1.4  Register Address 4
          1. Table 12. Register Address 4 Field Descriptions
        5. 7.6.1.5  Register Address 5
          1. Table 13. Register Address 5 Field Descriptions
          2. Table 14. Configurations When ENABLE Pin is Low
        6. 7.6.1.6  Register Address 6
          1. Table 15. Register Address 6 Field Descriptions
          2. Table 16. Configurations When ENABLE Pin is High
        7. 7.6.1.7  Register Address 7
          1. Table 17. Register Address 7 Field Descriptions
        8. 7.6.1.8  Register Address 8
          1. Table 18. Register Address 8 Field Descriptions
        9. 7.6.1.9  Register Address 12
          1. Table 19. Register Address 12 Field Descriptions
        10. 7.6.1.10 Register Address 13
          1. Table 20. Register Address 13 Field Descriptions
        11. 7.6.1.11 Register Address 14
          1. Table 21. Register Address 14 Field Descriptions
        12. 7.6.1.12 Register Address 15
          1. Table 22. Register Address 15 Field Descriptions
        13. 7.6.1.13 Register Address 16
          1. Table 23. Register Address 16 Field Descriptions
        14. 7.6.1.14 Register Address 19
          1. Table 24. Register Address 19 Field Descriptions
        15. 7.6.1.15 Register Address 22
          1. Table 25. Register Address 22 Field Descriptions
        16. 7.6.1.16 Register Address 23
          1. Table 26. Register Address 23 Field Descriptions
        17. 7.6.1.17 Register Address 26
          1. Table 27. Register Address 26 Field Descriptions
        18. 7.6.1.18 Register Address 29
          1. Table 28. Register Address 29 Field Descriptions
        19. 7.6.1.19 Register Address 30
          1. Table 29. Register Address 30 Field Descriptions
          2. Table 30. Configurations
        20. 7.6.1.20 Register Address 31
          1. Table 31. Register Address 31 Field Descriptions
          2. Table 32. Configurations
        21. 7.6.1.21 Register Address 32
          1. Table 33. Register Address 32 Field Descriptions
        22. 7.6.1.22 Register Address 33
          1. Table 34. Register Address 33 Field Descriptions
        23. 7.6.1.23 Register Address 99
          1. Table 35. Register Address 99 Field Descriptions
        24. 7.6.1.24 Register Address 100
          1. Table 36. Register Address 100 Field Descriptions
        25. 7.6.1.25 Register Address 103
          1. Table 37. Register Address 103 Field Descriptions
          2. Table 38. Pre-Emphasis Level is: Decimal Value / 30
        26. 7.6.1.26 Register Address 104
          1. Table 39. Register Address 104 Field Descriptions
        27. 7.6.1.27 Register Address 107
          1. Table 40. Register Address 107 Field Descriptions
          2. Table 41. Pre-Emphasis Level is: Decimal Value / 30
        28. 7.6.1.28 Register Address 108
          1. Table 42. Register Address 108 Field Descriptions
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
    3. 8.3 Design Requirements
    4. 8.4 Detailed Design Procedure
      1. 8.4.1 SNR and Clock Jitter
    5. 8.5 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 CML SerDes Transmitter Interface
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.5 Split-Mode Operation

The ADS54J54 provides several different options to interface it to the digital processor or processors. If the ADS54J54 device is operated in split sampling rate (2 channels at 500-MSPS output rate and 2 channels at 250-MSPS output rate), then it requires dual SYSREF (SYSREFAB and SYSREFCD) and dual SYNC (SYNCbAB and SYNCbCD).

Subclass 1 – Deterministic Latency: The device clock and synchronous SYSREF signal are provided by the timing unit to the ADS54J54 and the processor. The processor controls the SYNCb input signals for the JESD204B state machine for all four channels. In case the ADS54J54 is connected to two different processors, the differential SYNCb inputs of the ADS54J54 can be configured to two single-ended inputs where each pin controls the JESD204B state machine of the two corresponding channels.

ADS54J54 app_detLaten_slase67.gifFigure 62. Four Channel and Dual Two Channel Usage

Split Mode Operation: If the ADS54J54 device is operated with 2-channel output at 500 MSPS and 2-channel output at 250 MSPS, then dual SYSREF (SYSREFAB for channel A and B, SYSREFCD for channel C and D) as well as dual SYNC (SYNCbAB for channel A and B, SYNCbCD for channel C and D) is required to ensure normal operation because the JESD204B link configuration is different for the two channel pairs.

ADS54J54 app_splitMode_slase67.gifFigure 63. Dual SYSREF Usage