SCBS881F january   2010  – june 2023 TMS3705

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Functional Block Diagram
  6. 5 Revision History
  7. 6 Device Characteristics
    1. 6.1 Related Products
  8. 7 Terminal Configuration and Functions
    1. 7.1 Pin Diagram
    2. 7.2 Signal Descriptions
  9. 8 Specifications
    1. 8.1 Absolute Maximum Ratings #GUID-D01738F0-6DD5-4A5A-BE33-2BC076228CBE/AMR001
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Electrical Characteristics
    5. 8.5 Thermal Resistance Characteristics for D (SOIC) Package
    6. 8.6 Switching Characteristics
    7. 8.7 Timing Diagrams
  10. 9 Detailed Description
    1. 9.1  Power Supply
    2. 9.2  Oscillator
    3. 9.3  Predrivers
    4. 9.4  Full Bridge
    5. 9.5  RF Amplifier
    6. 9.6  Band-Pass Filter and Limiter
    7. 9.7  Diagnosis
    8. 9.8  Power-on Reset
    9. 9.9  Frequency Divider
    10. 9.10 Digital Demodulator
    11. 9.11 Transponder Resonance-Frequency Measurement
    12. 9.12 SCI Encoder
    13. 9.13 Control Logic
    14. 9.14 Test Pins
  11. 10Applications, Implementation, and Layout
    1. 10.1 Application Diagram
  12. 11Device and Documentation Support
    1. 11.1 Getting Started and Next Steps
    2. 11.2 Device Nomenclature
    3. 11.3 Tools and Software
    4. 11.4 Documentation Support
    5. 11.5 Support Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Glossary
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9.6 Band-Pass Filter and Limiter

The band-pass filter provides amplification and filtering without external components. The lower cut-off frequency is approximately a factor of 2 lower than the average signal frequency of 130 kHz, the higher cut-off frequency is approximately a factor of 2 higher than 130 kHz.

The limiter converts the analog sine-wave signal to a digital signal. The limiter provides a hysteresis depending on the minimal amplitude of its input signal. The duty cycle of its digital output signal is between 40% and 60%. The band-pass filter and the limiter together have a high gain of at least 1000.