×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Help Needed with LT1606

Help Needed with LT1606

Help Needed with LT1606

(OP)
Hi all ,
        Does any one have experience playing with LT1606..16 bit ADC from Linear Tech... The question i have is for adjusting the reference so that my fullscale swing is +/- 2V. The data sheet does not affirmatively say anything about it. It just says that Full scale voltage is 4 x Vref... Can i load the band gap reference (internal and protected) so that it generates 0.5 or 1V reference so that my Full scale voltage can swing only upto 2 to 4V...Any other suggestions welcome ..I have to use 16 bit ADC capable of sampling above 200Ksps with BYTE interface capability......Thanks in advance..

RE: Help Needed with LT1606

Yes, you can force the reference voltage to a low 0.5 V, but I do not think that you will gain anything. Your reference voltage will probably be noisier than the internal reference. Do you want this to get all 16 bits in the result? Try using an external amplifier instead. That, of course needs a bipolar power supply.
Another way is to use averaging. That will give you any resolution you want.

Gunnar Englund
www.gke.org

RE: Help Needed with LT1606

(OP)
Hi skog, thanks for replying. You are absolutely right and the output of this ADC is to be taken for various analysis. I have designed an AGC (Automatic gain control)stage that ensures the signal amplitude peak just around the peak value taken by ADC for best resolution and this whole system is battery operated, so my voltages are down to +/- 5v to keep the consumption as low as possible.But it looks like i will have to increase the swing !! . Since every sample taken is equally important spectrum wise, i can't play much with signal.... Could you tell me more about this averaging ? Not sure if you are referring to averaging of signal in digital domain after conversion or average signal in analog domain?....

RE: Help Needed with LT1606

Average in the digital domain. You can either do a moving average over n samples or do an IIR filter by calculating k*x(0) + (1-k)*sum[x(-1)] and scale to suit. x(-1) means earlier samples. The k sets the degree of filtering. A small k - say 1/16 - will make a lot of filtering. The latter technique is very much the same as using a first order low pass filter in analogue domain.

Gunnar Englund
www.gke.org

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources