SLVSEO0C August   2021  – June 2024 ADC12DJ4000RF

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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: DC Specifications
    6. 6.6  Electrical Characteristics: Power Consumption
    7. 6.7  Electrical Characteristics: AC Specifications (Dual-Channel Mode)
    8. 6.8  Electrical Characteristics: AC Specifications (Single-Channel Mode)
    9. 6.9  Timing Requirements
    10. 6.10 Switching Characteristics
    11. 6.11 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Inputs
        1. 7.3.1.1 Analog Input Protection
        2. 7.3.1.2 Full-Scale Voltage (VFS) Adjustment
        3. 7.3.1.3 Analog Input Offset Adjust
      2. 7.3.2 ADC Core
        1. 7.3.2.1 ADC Theory of Operation
        2. 7.3.2.2 ADC Core Calibration
        3. 7.3.2.3 Analog Reference Voltage
        4. 7.3.2.4 ADC Overrange Detection
        5. 7.3.2.5 Code Error Rate (CER)
      3. 7.3.3 Temperature Monitoring Diode
      4. 7.3.4 Timestamp
      5. 7.3.5 Clocking
        1. 7.3.5.1 Noiseless Aperture Delay Adjustment (tAD Adjust)
        2. 7.3.5.2 Aperture Delay Ramp Control (TAD_RAMP)
        3. 7.3.5.3 SYSREF Capture for Multi-Device Synchronization and Deterministic Latency
          1. 7.3.5.3.1 SYSREF Position Detector and Sampling Position Selection (SYSREF Windowing)
          2. 7.3.5.3.2 Automatic SYSREF Calibration
      6. 7.3.6 Programmable FIR Filter (PFIR)
        1. 7.3.6.1 Dual Channel Equalization
        2. 7.3.6.2 Single Channel Equalization
        3. 7.3.6.3 Time Varying Filter
      7. 7.3.7 Digital Down Converters (DDC)
        1. 7.3.7.1 Rounding and Saturation
        2. 7.3.7.2 Numerically-Controlled Oscillator and Complex Mixer
          1. 7.3.7.2.1 NCO Fast Frequency Hopping (FFH)
          2. 7.3.7.2.2 NCO Selection
          3. 7.3.7.2.3 Basic NCO Frequency Setting Mode
          4. 7.3.7.2.4 Rational NCO Frequency Setting Mode
          5. 7.3.7.2.5 NCO Phase Offset Setting
          6. 7.3.7.2.6 NCO Phase Synchronization
        3. 7.3.7.3 Decimation Filters
        4. 7.3.7.4 Output Data Format
        5. 7.3.7.5 Decimation Settings
          1. 7.3.7.5.1 Decimation Factor
          2. 7.3.7.5.2 DDC Gain Boost
      8. 7.3.8 JESD204C Interface
        1. 7.3.8.1  Transport Layer
        2. 7.3.8.2  Scrambler
        3. 7.3.8.3  Link Layer
        4. 7.3.8.4  8B/10B Link Layer
          1. 7.3.8.4.1 Data Encoding (8B/10B)
          2. 7.3.8.4.2 Multiframes and the Local Multiframe Clock (LMFC)
          3. 7.3.8.4.3 Code Group Synchronization (CGS)
          4. 7.3.8.4.4 Initial Lane Alignment Sequence (ILAS)
          5. 7.3.8.4.5 Frame and Multiframe Monitoring
        5. 7.3.8.5  64B/66B Link Layer
          1. 7.3.8.5.1 64B/66B Encoding
          2. 7.3.8.5.2 Multiblocks, Extended Multiblocks and the Local Extended Multiblock Clock (LEMC)
          3. 7.3.8.5.3 Block, Multiblock and Extended Multiblock Alignment using Sync Header
            1. 7.3.8.5.3.1 Cyclic Redundancy Check (CRC) Mode
            2. 7.3.8.5.3.2 Forward Error Correction (FEC) Mode
          4. 7.3.8.5.4 Initial Lane Alignment
          5. 7.3.8.5.5 Block, Multiblock and Extended Multiblock Alignment Monitoring
        6. 7.3.8.6  Physical Layer
        7. 7.3.8.7  SerDes Pre-Emphasis
        8. 7.3.8.8  JESD204C Enable
        9. 7.3.8.9  Multi-Device Synchronization and Deterministic Latency
        10. 7.3.8.10 Operation in Subclass 0 Systems
      9. 7.3.9 Alarm Monitoring
        1. 7.3.9.1 NCO Upset Detection
        2. 7.3.9.2 Clock Upset Detection
        3. 7.3.9.3 FIFO Upset Detection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Dual-Channel Mode
      2. 7.4.2 Single-Channel Mode (DES Mode)
      3. 7.4.3 Dual-Input Single-Channel Mode (DUAL DES Mode)
      4. 7.4.4 JESD204C Modes
        1. 7.4.4.1 JESD204C Operating Modes Table
        2. 7.4.4.2 JESD204C Modes continued
        3. 7.4.4.3 JESD204C Transport Layer Data Formats
        4. 7.4.4.4 64B/66B Sync Header Stream Configuration
        5. 7.4.4.5 Dual DDC and Redundant Data Mode
      5. 7.4.5 Power-Down Modes
      6. 7.4.6 Test Modes
        1. 7.4.6.1 Serializer Test-Mode Details
        2. 7.4.6.2 PRBS Test Modes
        3. 7.4.6.3 Clock Pattern Mode
        4. 7.4.6.4 Ramp Test Mode
        5. 7.4.6.5 Short and Long Transport Test Mode
          1. 7.4.6.5.1 Short Transport Test Pattern
          2. 7.4.6.5.2 Long Transport Test Pattern
        6. 7.4.6.6 D21.5 Test Mode
        7. 7.4.6.7 K28.5 Test Mode
        8. 7.4.6.8 Repeated ILA Test Mode
        9. 7.4.6.9 Modified RPAT Test Mode
      7. 7.4.7 Calibration Modes and Trimming
        1. 7.4.7.1 Foreground Calibration Mode
        2. 7.4.7.2 Background Calibration Mode
        3. 7.4.7.3 Low-Power Background Calibration (LPBG) Mode
      8. 7.4.8 Offset Calibration
      9. 7.4.9 Trimming
    5. 7.5 Programming
      1. 7.5.1 Using the Serial Interface
        1. 7.5.1.1 SCS
        2. 7.5.1.2 SCLK
        3. 7.5.1.3 SDI
        4. 7.5.1.4 SDO
        5. 7.5.1.5 Streaming Mode
    6. 7.6 SPI Register Map
  9. 8 Application Information Disclaimer
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Wideband RF Sampling Receiver
        1. 8.2.1.1 Design Requirements
          1. 8.2.1.1.1 Input Signal Path
          2. 8.2.1.1.2 Clocking
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Calculating Values of AC-Coupling Capacitors
        3. 8.2.1.3 Application Curves
    3. 8.3 Initialization Set Up
    4. 8.4 Power Supply Recommendations
      1. 8.4.1 Power Sequencing
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
7.3.8.5.3 Block, Multiblock and Extended Multiblock Alignment using Sync Header

The sync header contains two bits that are always opposite of each other (either 01 or 10). The JESD204C receiver can find the block boundaries by looking for a 66-bit boundary that always contains a 0 to 1 or 1 to 0 transition. Although 0 to 1 and 1 to 0 transitions will occur at other locations in a block, it is impossible for the sequence to appear at a fixed location, other than the proper sync header location, in successive blocks for a long period of time. The sync header indicates the start of a block and can be used for block alignment monitoring. If a 00 or a 11 bit sequence is seen at the assumed sync header location of a block, then block alignment may have been lost. Multiple occurrences of incorrect sync header bits should trigger a search for the sync header after sending SYSREF to all devices to reset LEMC alignment.

A sync header ([0:1]) of 01 corresponds to transmission of a 1 while a sync header of 10 corresponds to a transmission of a 0. The transmitted bit from the sync header of each block of a multiblock are combined into a 32-bit word called the sync header stream. The sync header stream is used to transmit data in parallel with the user data in order to synchronize the link by marking the borders of multiblocks and extended multiblocks. In addition, the sync header stream provides one of either CRC, FEC or a command channel. The device supports CRC-12 and FEC and does not support CRC-3 or the command channel.

The 32-bit sync header stream always ends with a 00001 bit sequence, called the end-of-multiblock (EoMB) signal, that indicates the end of a multiblock. For CRC and command channel modes, a 00001 sequence will never occur in any other location in the sync header stream. For FEC mode, it is possible for a 00001 sequence to appear in another location within the sync header stream, however it is improbable to see the 00001 sequence in the same location within a sequence of multiple multiblocks. Therefore, in FEC mode it may take more than one multiblock to find the end of a multiblock. The end of an extended multiblock is found for all modes by monitoring bit 22 of the sync header stream, the EoEMB bit, which indicates the end of an extended multiblock when set to a 1. The EoMB (00001) and EoEMB signals, as well as fixed 1s in the sync header stream for CRC and command channel modes, form the pilot signal of the sync header stream.

The defined format for each form of the sync header stream are defined in the following sections.