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AD7689 PulSAR bandwidth choice

Question asked by jimacb on Jun 18, 2015
Latest reply on Jul 2, 2015 by KarenNE

BACKGROUND

I'm designing a product which uses the AD7689 near full speed (210 kSps), scanning each channel successively .  All of the inputs are nominally at the same midscale value.  If one channel deviates from the others even by 50mV, an FPGA will attempt to bring it under control.

 

QUESTION

If the channel-to-channel differences are small, is it OK to use 1/4 bandwidth?  If I understand the architecture correctly, the SHA is not zeroed out between conversions. Thanks!

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