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refence of VDAC question | Cypress Semiconductor

refence of VDAC question

Summary: 3 Replies, Latest post by danaaknight on 29 May 2012 08:22 AM PDT
Verified Answers: 0
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user_210544126's picture
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1 post

In our old plan,we change the Refence Voltage of DAC by using a Potentiometer to make the output adjustable.Now we want to change our plan by using PSOC3 ,but the VDAC have no ext. Refence function,I wander  if there is another way to get our goal .

PS:We need two independent VDAC output signals but one  Potentiometer .

Thanks.

user_1377889's picture
User
10803 posts

The easiest approach would be to use an ADC to measure the voltage over the potentiometer and change the DAC accordingly. Since the DAC in a PSoC3 delivers a voltage referenced to GND I see no other chance to change its output.

 

Bob

user_2405011's picture
User
88 posts

Silen,

Why do you want to change the VDAC reference, is this for shifting offset or for changing gain or for both?

Depending on what you want, you could probably configure an OPAMP component to do the job.

 

Regards,

Rolf

user_14586677's picture
User
7648 posts

If you are looking for a multiplying DAC you could use DAC trim register to effect a

limited solution.

 

Or take a look at this thread -

 

http://www.psocdeveloper.com/forums/viewtopic.php?f=42&t=6862&view=next

 

Regards, Dana.

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