The single-ended outputs are capable to drive inputs e.g. of an external Analog-to-Digital Converter (ADC) referenced to VCC. For an optimal use of the ADC input range the cosine and sine output voltages are tracking ratiometric with the supply voltage.
The sensor takes 3.3v as Vref and the a to d values vary as the magnetic field varies.
You need to run an FFT, that 'd produce magnitude and phase, plus approximate frequency
After carefully calibrating the sensor for gain and offset errors, and subtraction of offset
From sensors's DataSheet: So, you just feed two outputs directly into arduino analog pins.I didn't get:There is no ref. pin, my understanding outputs biased around 1/2 V.You need to run an FFT, that 'd produce magnitude and phase, plus approximate frequency