I want to use an ADXl326 accelerometer to measure vibration in one plane only. The accelerometer is fed with 3.3 V and returns 1.65 V at 0 g +/- 57 mV/g
What I want to do is remove the 1.65 V bias to get an AC signal, then amplify that signal so it is close to -1.65 / +1.65 V so that I can add the bias back and have a DC signal again, which is close to the full ADC range of 0-3.3 V.
I considered using an AD8221 instrumentation amplifier with no gain resistance on pins 2 & 3 i.e. unity gain, followed by a PGA112 programmable gain amplifier with SPI control and 1.65 V on the reference pin.
However, I was wondering if anyone had any suggestions which would not need a -5 & +5 V supply?