I'm trying to amplify the output of a gyroscope that feeds into a 10bit A/D for my micro. I need to be able to read down to .1 dps resolution. The gyroscope that I'm using is a 100dps gyro that has 2.5 mV/dps sensitivity. Calculating it out, I think I need a gain of ~13 in order for it to reach the resolution I need with a 10bit ADC.

I can't for the life of me figure out the amplifier circuit. I've been working on it for hrs and going round and round.

The gyro outputs a 1.5V zero rate level and also has a 1.5Vref. The amplifier I've been using is a LMC7111 powered by +3.3V.

Can you guys help me? I've mostly done digital designs and coding so analogs are not my strong suit.

Thanks in advance!

 

Go to national.com and download application notes AN-20 and AN-31. Remember to use 0.1 uF ceramic and 10uF electrolytic caps in parallel to ground from each power pin of each IC.