App Note: Digital potentiometer in analog applications

in app notes by DP | 2 comments

maxApp

Here’s an app note from Maxim describing the use of a digital potentiometer in analog circuits like amplifiers and filters. By using a digital potentiometer in an op-amps feedback loop, a digitally controllable variable gain amplifier is constructed.

Variable gain amplifiers often use a mechanical potentiometer to set the gain. An example is a volume control dial. However, when the analog signal path is digitally controlled, a digital potentiometer might be used to control gain. This article discusses the use of the digital potentiometer to form digitally controlled gain or filter blocks.

This entry was posted in app notes and tagged , .

Comments

  1. Tim Kerby says:

    If you are designing circuits like this, be careful of the capacitance inherent in the digital potentiometers. You may need to add some compensation to avoid issues with frequency response.

  2. Darrell says:

    Also note initial startup conditions, as many digital pots default to different values at powerup, potentially making the analog circuit do unexpected things until the digipot is initialized/set correctly.

Leave a Comment

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Notify me of followup comments via e-mail. You can also subscribe without commenting.