I'm not sure if I'm understanding the gain bandwidth correctly, but can I use OA1ZHA op amp for a signal with ADC sampling frequency of 2 kHz? or am I really limited to only 400 kHz based on maximum gain bandwidth? does ST make op amps with higher bandwidth?
I have a biological signal that needs significant amplification, hence I will be using instrumental amplifier schematic as showed in fig 48 of the datasheet and set Rg to gain of about 500. I read somewhere that bandwidth = gain x sampling frequency? Does that mean I can only amplify by a factor of 200? 400k = 200 x 2K?
or since I'm using configuration showed in fig 48, that equation doesn't apply? I'm hoping that equation only applies for amplying using 1 op amp only?