SLLSFD6A May   2020  – March 2021 THVD8000

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 ESD Ratings - IEC Specifications
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 Power Dissipation Characteristics
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 OOK Modulation with F_SET pin
      2. 8.3.2 OOK Demodulation
      3. 8.3.3 Transmitter Timeout
      4. 8.3.4 Polarity Free Operation
      5. 8.3.5 Glitch Free Mode Change
      6. 8.3.6 Integrated IEC ESD and EFT Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 OOK Mode
      2. 8.4.2 Thermal shutdown (TSD)
  9. 9 Application Information Disclaimer
    1. 9.1 Application information
    2. 9.2 Typical application (OOK mode)
      1. 9.2.1 Design requirements
        1. 9.2.1.1 Carrier frequency
      2. 9.2.2 Detailed design procedure
        1. 9.2.2.1 Inductor value selection
        2. 9.2.2.2 Capacitor value selection
      3. 9.2.3 Application Curves
  10. 10Power supply recommendations
  11. 11Layout
    1. 11.1 Layout guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary

8.3.1 OOK Modulation with F_SET pin

Data at the D input is modulated with the carrier frequency (f0) via the F_SET pin. Figure 8-1 illustrates the modulation scheme. A high level at the D input is driven to the mid-level with zero differential voltage (VOD). A low level at the D input is modulated at the carrier frequency. It is recommended to use a carrier frequency that is 10x higher than the data rate. Higher data rates are possible at the expense of increased pulse width distortion with the use of lower ratios.

GUID-3254DD99-629C-4EDE-8359-897FEE747C5B-low.gifFigure 8-1 OOK Modulation Scheme

f0 is programmable by changing the external resistor (RF_SET) value connected to ground. Table 8-1 shows the carrier frequency for the each recommended resistor value.

Table 8-1 OOK f0 versus RF_SET
RF_SET (kΩ)OOK f0 (kHz)
77125
50187.5
19500
12.5750
9.31000
4.42000
1.55000

The oscillator used to generate the carrier frequency features spread spectrum clocking to reduce emissions.