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Dual-Channel VCAs: Methods for Powering Down One Channel

 

Texas Instruments offers several product groups of highly-integrated voltage-controlled amplifiers (VCAs) including the VCA2611/12/13/16 and the VCA2614/18/19. Both the VCA2611 and the VCA2614 families feature two channels, either of which can be powered while powering down the other. This application note outlines two possible approaches to this question and describes the steps needed to assure the greatest chance of success. Additional methods to accomplish this task are also suggested. This report applies to any member of the VCA2611 and VCA2614 families.