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OA1ZHA / TSZ121 precision amplifier

Question asked by Kevin A on Sep 16, 2017
Latest reply on Sep 18, 2017 by AvaTar

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?