SBOSAA9A March   2023  – June 2024 TRF0208-SEP

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Fully-Differential Amplifier
      2. 6.3.2 Single Supply Operation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Power Down Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Driving a High-Speed ADC
      2. 7.1.2 Calculating Output Voltage Swing
      3. 7.1.3 Thermal Considerations
    2. 7.2 Typical Applications
      1. 7.2.1 TRF0208-SEP in Receive Chain
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Package Option Addendum
    2. 10.2 Mechanical Data

7.1.1 Driving a High-Speed ADC

A common application for the TRF0208-SEP is driving a high-speed ADC that has a differential input (such as the ADC12DJ5200-SEP or AFE7950-SEP). Conventionally passive baluns are used to drive giga-samples-per-second (GSPS) ADCs as a result of the low availability of high-bandwidth, linear amplifiers. The TRF0208-SEP is typically configured as a single-ended to differential (S2D) RF amplifier that has excellent bandwidth flatness, gain, and phase imbalance comparable to or exceeding costly passive RF baluns.

Figure 7-1 shows a typical interface circuit for ADC12DJ5200-SEP. Depending on the ADC and system requirement, this circuit can be simplified or can be more complex.

TRF0208-SEP Interfacing With the ADC12DJ5200-SEP Figure 7-1 Interfacing With the ADC12DJ5200-SEP

Figure 7-1 shows two sections of the circuit between the driver amp and the ADC: namely, the matching pad (or attenuator pad) and the antialiasing filter. Use small-form-factor, RF-quality, passive components for these circuits. The output swing of the TRF0208-SEP is designed to drive these ADCs full-scale, while at the same time not overdrive the ADC. This functionality avoids the need for any voltage limiting device at the ADC.

Figure 7-2 shows a typical interface circuit for the AFE7950-SEP, where the TRF0208-SEP is the S2D amplifier.

TRF0208-SEP Interfacing With the AFE7950-SEP
A. AFE matching network – component type (L or C) and values depend on channel (A, B, C, D, FB1, and FB2) and frequency band.
Figure 7-2 Interfacing With the AFE7950-SEP