Hi.. i'm looking for a signal conditioning CHIP for converting the output of a single point load cell of 2mV/V to 0~10v. this chip must consist of a low pass filter which is to remove the noise ( high freq) and an amplifier to amplify the signal from 2mV to the range of 0~10V.Do you have any idea on this kind of chip? can i have the s/n of this chip? Thanks
I do not know of a chip that will give you up to 10V output, but there are chips that will give you a digital output. If you want 0 to 10V output, I would use an instrumentation amplifier. If you do not know how to use these amplifiers, tell me the load cell you are using and what voltage you want to power it from and I will try to help you with a circuit.
Maxim Integrated Products makes two signal conditioning chips that I know of. They are the MAX1452 and the MAX1464. ZMD (http://www.zmdi.com) in Germany also has some signal conditioning chips for pressure sensors and load cells. Go to their web site and hover your mouse over the "Products" button and you will see 8 Sensor Signal Conditioner Products.
You need a bit more spec before you can decide how to process the signal. For load cell signal the key parameters are usually noise, offset drift over temperature and gain drift over temperature. Undemanding applications can get away with 'scale on a chip' solutions but good load cells outperform such chips.
You bring up a very good pooint. However, many people looking for load cell conditioning circuits or chips do not need all of the performance that the load cell will provide. I leave it to the user to decide if a given circuit or chip will provide the performance he/she needs. With the type of questions we have on this forum, there is generally no way to know all of the requirements any given person has. But your comment is a good one and I do appreciate it.
Your load cell is a Wheatstone resistive bridge, if its a 4 wire you can use a differential A/D converter to convert that paramter. I'll leave the calculations up to you because you need to learn how to do that, but the ADS1248IPW.ADS1248IPW.http://focus.ti.com/docs/prod/folders/print/ads1248.html would be a good place to start if your going to put this on a board.
