I have a 3.3v power supply (lithium ion battery) and am using a TI MPS430G2553 chip to generate a 25khz square wave using 2 PWM pins and a push-pull setup. This square wave goes from -3.3v to +3.3v. I need it to produce at least double that voltage (-6.6v to +6.6v) without messing up the 25khz square wave. I will be programatically changing the frequency of this wave from time to time, but will keep it within 1khz of 25khz.
The above circuit is driving a 25khz Piezo Transducer which has a capacitance of 2500pf. The current setup is producing about 80dB. I need 115dB. The datasheet on the Piezo says that at 10v (I'm assuming peak to peak), it will produce 115dB. So if I could double the voltage of the above circuit while maintaining the square wave, I believe I could accomplish my goal.
I have no additional power supply and would like to accomplish this with as few components as possible, for as low cost as possible.
Any recommendations with a circuit example would be GREATLY appreciated.