SCDS443C October   2022  – October 2024 TMUX7201 , TMUX7202

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  Thermal Information
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Source or Drain Continuous Current
    6. 5.6  ±15V Dual Supply: Electrical Characteristics 
    7. 5.7  ±15V Dual Supply: Switching Characteristics 
    8. 5.8  ±20V Dual Supply: Electrical Characteristics
    9. 5.9  ±20V Dual Supply: Switching Characteristics
    10. 5.10 44V Single Supply: Electrical Characteristics 
    11. 5.11 44V Single Supply: Switching Characteristics 
    12. 5.12 12V Single Supply: Electrical Characteristics 
    13. 5.13 12V Single Supply: Switching Characteristics 
    14. 5.14 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1  On-Resistance
    2. 6.2  Off-Leakage Current
    3. 6.3  On-Leakage Current
    4. 6.4  tON and tOFF Time
    5. 6.5  tON (VDD) Time
    6. 6.6  Propagation Delay
    7. 6.7  Charge Injection
    8. 6.8  Off Isolation
    9. 6.9  Bandwidth
    10. 6.10 THD + Noise
    11. 6.11 Power Supply Rejection Ratio (PSRR)
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Bidirectional Operation
      2. 7.3.2 Rail-to-Rail Operation
      3. 7.3.3 1.8V Logic Compatible Inputs
      4. 7.3.4 Integrated Pull-Down Resistor on Logic Pins
      5. 7.3.5 Fail-Safe Logic
      6. 7.3.6 latch-up Immune
      7. 7.3.7 Ultra-Low Charge Injection
    4. 7.4 Device Functional Modes
    5. 7.5 Truth Tables
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 TIA Feedback Gain Switch
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.1 TIA Feedback Gain Switch

One application of the TMUX720x is to configure the feedback on a discrete transimpedance amplifier (TIA) implementation. Often, TIAs are used in applications such as photodiode inputs, which then feeds into an ADC or MCU/processor. Depending on the expected strength of the photodiode input, and the needed accuracy, multiple gain levels are needed. A switch like the TMUX720x allows for different gain values to be selected, changing the level of amplifications. This solution can be scaled, but as much as needed for multiple gain options.

Figure 8-1 shows the TMUX720x configured with a precision op amp to enable multiple gains.

TMUX7201 TMUX7202 TIA Feedback Control Figure 8-1 TIA Feedback Control