Hello All -- Help would be greatly appreciated.
I am using the AFE4490 chip for a university project -- I used the reference design for only the AFE section. We are using a different microcontroller, but have not even hooked it up yet. The chip was working yesterday (TX_REF (pin9) was outputting 0.75V, we were getting the clock signal out of CLKOUT (pin30), BG (pin9) was getting 1V, and VCM (pin4) was getting the expected 0.9V)
Now, I am getting 0V for BG and VCM and we are getting no clock out.
TX_REF is getting 5V output instead of the expected 0.75V.
I am not sure what could be wrong. Any suggestions on debugging?
Thank you!
(http://www.ti.com/lit/ug/slau480a/slau480a.pdf)