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AN-2555 : Why are two amplifier stages needed?

Category: Hardware
Product Number: LTC6373

Dear ADI Forum,

we want to use LTC6373 to directly drive the LTC2311-16 ADC for a flexible current measurement application for (high performance) motor control.

Reading AN-2555, I was surpised to find that two amplifier are used in series.

Can someone explain the reasoning behind this choice and if it is a bad idea to drive the inputs of LTC2311 directly from LTC6373 

We sample with up to 2MSPS.

Thank you and best regards

eyke

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