Dear sir/madam:
I am using AFE5808AEVM. In the datasheet the full scale is 2Vpp. And the resolution is 14bits so code resolution is 2/(2^14), right? But when I chose 10mVpp input and LNA set to 12dB, PGA set to 24dB, VCA se to -36dB so there is no gain. But finally I got 200codes Vpp(=20mV accroding to my calculation) that doesnt match the resolution. I am just curious what's going on Maybe my computation is wrong.
And when I set the gain to 6dB and 12dB is pretty good I got about 400codes vpp(6dB is double) and 800 codesvpp (for 12dB which makes sense), but when I set the gain to 42dB and 54dB, I got 1036codes vpp and 3625codes vpp the results seem to be much smaller than the gain I set?
Thank you so much,
Jin