Wired-OR MUX and PGA Reference Design


Design files


This board demonstrates a wired-OR multiplexer (MUX) and a programmable gain amplifier (PGA) application of the OPA837 operational amplifier. These applications are made possible with the high-impedance output of the amplifier and the high-impedance inverting input while in power-down (PD) mode. It is possible to select the output of the MUX or PGA with the onboard dual-inline package (DIP) switches or transistor logic inputs from SMA connectors. The board is single or dual-supply compatible up to 5.25 V. An optional noise filter is included at the output to eliminate broadband noise for PGA designs with lower bandwidth.

  • Change between MUX and PGA configurations
  • Drive with single or dual supplies
  • Supplemental DIP switch input provides simple output selection
  • True input to output isolation
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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.

TIDUDJ0.PDF (4067 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRWS5.ZIP (3226 K)

Files used for 3D models or 2D drawings of IC components

TIDCES9.ZIP (2245 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

High-speed op amps (GBW ≥ 50 MHz)

OPA837Low-power, precision 105-MHz voltage-feedback operational amplifier

Data sheet: PDF | HTML
Digital demultiplexers & decoders

SN74LVC1G1392-Line-to-4-Line Decoder

Data sheet: PDF | HTML
General-purpose op amps

TLV2362Dual, 5-V, 7-MHz, low noise (8-nV/√Hz) operational amplifier

Data sheet: PDF
Inverting buffers & drivers

SN74LVC2G042-ch, 1.65-V to 5.5-V inverters

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Op-Amp in Wired Or Mux Configuration Reference Design Using Disable Pin Jul. 26, 2018

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