TIPD105

AC-coupled comparator reference design for 2-kHz to 32-MHz input

TIPD105

Design files

Overview

This reference design provides the theory, component selection, and simulation of a single supply comparator required to use AC coupling to detect sine waves or square waves. Often this is needed due to differences in ground between two different modules. Whenever AC coupling is involved into single supply circuitry negative voltages become a concern. Excessive negative voltages on comparators can cause the comparator to trip erroneously or to stay stuck at unpredictable levels. Proper high pass filtering and DC offsetting are required for reliable operation. This design will show how to AC couple a wide range of input signal levels and frequencies into a high speed comparator to generate a robust and accurate clock signal.

Features
  • AC Couples Pulses to eliminate Ground Potential Differences      
  • Comparator Outputs 0V to 5V      
  • Single-Supply Solution      
  • Input Frequency from 2kHz to 32MHz, 40% to 60% duty cycle
  • Utilizes TLV3501 for fast response time 
  • Utilizes Offset and Filter for reliable Single Supply Operation

 This Precision Reference Design Includes

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Modification Options
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLAC576.ZIP (1398 K)

Detailed schematic diagram for design layout and components

TIDR149.PDF (73 K)

Detailed schematic diagram for design layout and components

TIDR150.PDF (186 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

Products

Includes TI products in the design and potential alternatives.

Comparators

TLV35014.5ns, Rail-to-Rail, High Speed Comparator with Shutdown

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* User guide AC-Coupled, Single-Supply Comparator Reference Design (Rev. A) Sep. 21, 2016

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI SPICE-based analog simulation program

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