I'm building a blood pressure measuring system (passive). I'm plugging inline to a portable blood pressure cuff system, to passively measure the pressure in the cuff with a teensy 3.0.
I've identified an inexpensive sensor that should work.
The specs on the mouser page say that the sensor is powered by 5V, but I don't see any mention of that in the datasheet. The teensy operates at 3.3V.
The output of the sensor is from 0 to 4mV, so it would ideally be amplified 825x to get the full range of 3.3V of the ADC on the teensy 3.0, although considerably less amplification is probably fine. Especially since the teensy 3 has 16-bit ADC.
Can I use the 5V from the USB power driving the teensy? I'm not sure if I can get the USB 5V off of one of the teensy 3 pins. And is that a good thing to do because it should be more amplification? I would imagine it's better to use the 3.3V since then it would be the same voltage as a reference for the ADC, as well as the sensor.
But most importantly, what is a simple amplification circuit that I can use? I would prefer buying a single chip to get the voltage amplification but any other pointers to get something working would be much appreciated. Obviously I just need the voltage scaled, I don't need any more current. I'm still a novice at the electronics so the simpler, the better.
Mouser page: http://www.mouser.com/Search/ProductDetail.aspx?R=2SMPP-02virtualkey65300000virtualkey653-2SMPP-02
teensy 3: http://www.pjrc.com/teensy/schematic.html
Thanks in advance,