AD8306: Time constant required for the dc-offset

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Question The AD8306 datasheet mentions a "special dc-offset sensing cell" (page 7) to 
 null residual input offset. For our fast optical range finding application I 
 would be interested in the time constant (response time) of this dc-offset 
 -sensing that possibly limits our sampling speed. Answer The internal offset compensation loop in the AD8306 has a high-frequency corner 
 which allows for accurate measurement of input signals down to 5MHz. Above 5MHz 
 the speed of the compensation loop shouldn't have any impact on the device's 
 measurement accuracy. If you want more info on how this loop works I suggest 
 you look at pg.11 in the AD8309 datasheet. Both of these devices are internally 
 the same, the AD8306 only differs in that it is laser trimmed to have less 
 variation in slope and intercept. 
 
 Some additional log amp information can also be found in the AD8307 datasheet.

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AD8306: FAQ