SLOS776A September   2012  – December 2015 THS789

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Host Serial Interface DC Characteristics
    7. 6.7 Host Serial Interface AC Characteristics
    8. 6.8 Power Consumption
    9. 6.9 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 Counter, Latches, Clock Multiplier
      2. 7.3.2 Channels, Interpolator
      3. 7.3.3 FIFO
      4. 7.3.4 Calibration, ALU, Tag, Shifter
      5. 7.3.5 Serial Interface, Temperature, Overhead
    4. 7.4 Device Functional Modes
      1. 7.4.1 Serial-Results Interface
      2. 7.4.2 Resister Map Descriptions for All Channels and Central Register
    5. 7.5 Programming
      1. 7.5.1 Host Processor Bus Interface
        1. 7.5.1.1  Serial Interface
        2. 7.5.1.2  Read vs Write Cycle
        3. 7.5.1.3  Parallel (Broadcast) Write
        4. 7.5.1.4  Address
        5. 7.5.1.5  Data
        6. 7.5.1.6  Reset
        7. 7.5.1.7  Chip ID
        8. 7.5.1.8  Read Operations
        9. 7.5.1.9  Write Operations
        10. 7.5.1.10 Write Operations to Multiple Destinations
      2. 7.5.2 Serial-Results Interface and ALU
        1. 7.5.2.1 Event Latches
        2. 7.5.2.2 FIFO
        3. 7.5.2.3 Result-Interface Operation
        4. 7.5.2.4 Serial Results Latency
        5. 7.5.2.5 TMU Calibration
        6. 7.5.2.6 Temperature Sensor
    6. 7.6 Register Maps
      1. 7.6.1 Register Address Space
      2. 7.6.2 Register Map Detail
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedures
        1. 8.2.2.1 Time Measurement
        2. 8.2.2.2 Output Clock to Data/Strobe Phasing
        3. 8.2.2.3 Master Clock Input and Clock Multiplier
        4. 8.2.2.4 Temperature Measurement and Alarm Circuit
        5. 8.2.2.5 LVDS-Compatible I/Os
        6. 8.2.2.6 LVDS-Compatible Inputs
        7. 8.2.2.7 LVDS-Compatible Outputs
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

All the high-speed time-measurement circuitry in the TMU is implemented in differential emitter-coupled logic (ECL). Besides high speed, a characteristic of differential ECL is good rejection of power-supply noise and variation. However, there is a great deal of CMOS logic, FIFO and output-serial interface circuitry that is an excellent source of power-supply current noise. Therefore, to maintain the best accuracy, the TMU power supply must be low-impedance. This is accomplished in the usual ways by careful layout, good ground and power planes, short traces to the power and ground pins, and capacitive bypassing. TI recommends placing a quality, low inductance, high-frequency bypass capacitor of approximately 0.01 μF close to each power pin. The 0402 size works well. Additional bypass capacitors of larger value should be placed near the TMU, making low-inductance connection with the power and ground planes. With a typical power-supply sensitivity of 30 ps/V, a 1% power supply shift yields a 1-picosecond additional error, making power-supply regulation important for the best accuracy.