off-topic: 5V single supply rail-rail i/p & o/p op amps?

newguy · Joined: 24 Jun 2004 Posts: 1911

The subject says it all. Anyone know of any? Preferably cheap?

I have several automotive sensors that have an analog output, 0 - 5V. I would like to buffer them before they go into the PIC's A/D inputs, mainly because I'd like to have something between the PIC and the outside world to protect the PIC.

I've tried to find suitable single supply op amps, but pretty much every one that I've found won't quite do what I want. As it turns out, the lcd module that I'll be using requires a negative bias, so as a last resort I'm going to use a plain old cheap +/- supply op amp, since I already have a negative supply available. It's just that I'm stubborn, and I really don't want to do it this way! Laughing

As an afterthought, does anyone know of a single supply op amp that can be powered from, say 9V, and be able to buffer the 0 - 5V signal that I have?

drh · Posted: Fri Jul 23, 2004 9:33 am

Look at the LM7301. www.national.com.

Ttelmah · Guest

Or the MAX4165. Nice if you need quite a bit of drive power.

Best Wishes

Charlie U · Posted: Fri Jul 23, 2004 10:12 am

http://focus.ti.com/lit/ds/symlink/tlv2371.pdf

Haplo · Joined: 06 Sep 2003 Posts: 659 Location: Sydney, Australia

TLC2274 may be a good choice too.

languer · Joined: 09 Jan 2004 Posts: 144 Location: USA

Take a look a the OPA340 (single), OPA2340 (dual), OPA4340 (quad) from TI, great little devices.

Will Reeve · Joined: 30 Oct 2003 Posts: 209 Location: Norfolk, England

For low power I use OPA334 or OPA2334 (2 in 8pin) or OPA4334 (4 in 14pin), my personal favourite!
For a little more "go" I use the TS924 which will drive 80mA into low loads (or should be high loads, low resistances anyway!).
I think a lot of opamp choice comes down to personal preference, there is so many on the market which have very similar specs that when you find one which works well and you know it's parameters you tend to stick with it. I always have a few of the above ready for a quick bread board prototype and they usually end up in the final design!

Keep well,

Will