SCDS388B November   2018  – February 2024 TMUX1108

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics (VDD = 5V ±10 %)
    6. 6.6  Electrical Characteristics (VDD = 3.3V ±10 %)
    7. 6.7  Electrical Characteristics (VDD = 2.5V ±10 %), (VSS = –2.5V ±10 %)
    8. 6.8  Electrical Characteristics (VDD = 1.8V ±10 %)
    9. 6.9  Electrical Characteristics (VDD = 1.2V ±10 %)
    10. 6.10 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1  On-Resistance
      2. 7.1.2  Off-Leakage Current
      3. 7.1.3  On-Leakage Current
      4. 7.1.4  Transition Time
      5. 7.1.5  Break-Before-Make Delay
      6. 7.1.6  Turn-On and Turn-Off Time
      7. 7.1.7  Charge Injection
      8. 7.1.8  Off Isolation
      9. 7.1.9  Crosstalk
      10. 7.1.10 Bandwidth
    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 Fail-Safe Logic
      5. 7.3.5 Ultra-low Leakage Current
      6. 7.3.6 Ultra-low Charge Injection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Truth Tables
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
    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

8.2.2 Detailed Design Procedure

The TMUX1108 can operate without any external components except for the supply decoupling capacitors. If the device desired power-up state is disabled, the enable pin should have a weak pull-down resistor and be controlled by the MCU via GPIO. All inputs being muxed to the ADC must fall within the recommend operating conditions of the TMUX1108 including signal range and continuous current. For this design with a supply of 3.3V the signal range can be 0V to 3.3V and the maximum continuous current can be 30mA.

The design example highlights a multiplexed, data-acquisition system for highest system linearity and fast settling. The overall system block diagram is shown in Figure 8-1. The circuit is a multichannel, data-acquisition signal chain consisting of an input low-pass filter, mux, mux output buffer, SAR ADC driver, and the reference buffer. The architecture allows fast sampling of multiple channels using a single ADC, providing a low-cost solution.