SNLS766 July   2024 TDP20MB421

PRODUCTION DATA  

  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 DC Electrical Characteristics
    6. 5.6 High-Speed Electrical Characteristics
    7. 5.7 SMBUS/I2C Timing Characteristics
    8. 5.8 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 5-Level Control Inputs
      2. 6.3.2 Linear Equalization
      3. 6.3.3 Flat Gain
    4. 6.4 Device Functional Modes
      1. 6.4.1 Active Mode
      2. 6.4.2 Standby Mode
    5. 6.5 Programming
      1. 6.5.1 Pin Mode
      2. 6.5.2 SMBUS/I2C Register Control Interface
        1. 6.5.2.1 Shared Registers
        2. 6.5.2.2 Channel Registers
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 DP 2.1 Mainlink Signal Conditioning
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
    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 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

6.3.3 Flat Gain

The GAIN pin can be used to set the overall datapath for the flat gain (broadband gain including high frequency) of the TDP20MB421 when the device is in Pin Mode. The pin GAIN sets the Flat-Gain for all channels. Each channel is independently set in I2C Mode. Table 6-3 shows the configuration settings for flat gain control. The default recommendation for most systems is GAIN = L4 (float) because it provides a flat gain of 0dB.

Set the flat gain and equalization of the TDP20MB421 so that the output signal swing at DC and high frequency does not exceed the DC and AC linearity ranges of the devices.

Table 6-3 Flat Gain Configuration Settings
Pin ModeGAINI2C Modeflat_gain_2:0Flat Gain
L00−5.6dB
L11−3.8dB
L23−1.2dB
L37+2.6dB
L4 (float)5+0.6dB (default recommendation)