Replacement for Obsolete AD639 Trigonometric Function Converter Chip

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Discussion Overview

The discussion revolves around the search for a replacement for the obsolete AD639 trigonometric function converter chip. Participants explore potential alternatives, sources for the chip, and methods for generating sine waves from triangle waves.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about other manufacturers that produce similar trigonometric function converter chips.
  • Another suggests looking for second sources for the AD639 and provides a link to a distributor's website.
  • A participant mentions having built an alternative circuit that offers lower thermal drift and harmonic distortion compared to the AD639.
  • Some participants note the availability of AD639D chips, although their relevance is questioned due to the age of the thread.
  • One participant expresses a desire to experiment with the chip for inverse sine functions but indicates difficulty in obtaining it.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific replacement for the AD639, and multiple competing views regarding sourcing and alternatives remain present.

Contextual Notes

There are limitations regarding the reliability of suggested distributors and the effectiveness of alternative circuits, which are not fully explored or validated in the discussion.

Who May Find This Useful

Individuals interested in electronics, particularly those working with obsolete components or seeking alternatives for trigonometric function generation.

Gokul43201
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The AD639 is a trigonometric function converter chip that was made by Analog Devices, and is now obsolete. They, however, do not make a replacement.

http://www.analog.com/UploadedFiles/Obsolete_Data_Sheets/55889558331308887AD639.pdf

1. Does anyone else make a similar chip ?

2. Do you know any reliable distributors for obsolete electronics that I can call for the AD639 ?

3. If nothing comes out of 1 and 2, what's the next best way to generate a low-distortion sinewave, from a triangle-wave input ?

Any help is appreciated.
 
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You may still be able to find 2nd sources for AD639 (http://www.usbid.com/part.cfm/AD639 , search under "locate inventory") You'll need to some research as to reliability of each distributor.
 
Last edited by a moderator:
Just noticed this response today. Thanks for the tip Oua! I've bookmarked USBid for future reference.

For now, I've built an alternative circuit with lower thermal drift and harmonic distortion than the AD639.
 
I came across some AD639D which I don't need.
 
4richardnacha said:
I came across some AD639D which I don't need.

Well, this thread is over 3 years old, so they may not need them anymore... :wink:
 
I've always wanted to get this chip to experiment with an inverse sine but could never get it and forgot about it.
 

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