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Dear all, 
 I want to design a transimpedance amplifier with LTC6226, and for the layout I noticed the exposed pad other the chip is connected to V-, but normally it is connected to GND?!

So, it means, for example, if I connect V- to (-2.5 V), in fact I should connect the exposed pad to -2.5 v as well? I expected the exposed pad should be tied to GND! 
 
 Regards, 
 Behnam,

GioBalgemino · Accepted Answer

Hi Andromeda8 , 
 Connecting the exposed pad to ground is not always the case, it depends on the part. Normally not electrically isolated, it typically needs to be connected to a ground or power plane, depending on the device. I would always recommend following the datasheet. For the LT6226, the EPAD must be connected to ground for single supply, and V- for dual supply configuration. 
 Here are some links that may help you with your question: 
 https://www.analog.com/en/resources/analog-dialogue/articles/high-speed-printed-circuit-board-layout.html 
 https://www.analog.com/en/resources/design-notes/exposed-pads-a-brief-introduction.html 
 
 Thanks, 
 Gio)

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