AD8541 Large Signal Voltage Gain 's Vs dependency

Question

Hi 
 AD8541 revG datasheet say 
 Regarding about Large Signal Voltage Gain 
 Avo= 100V/mV @ Vs=2.7V, 3.0V 
 but Avo=20V/mV @ Vs=5.0V 
 Load is 100Kohm, so these are not a big difference, I think. 
 Could I see the "Avo vs Vs" feature? 
 Regards 
 moto

ADIApproved · Accepted Answer

Hi, moto. 
 AD8541 is stable with supplies between 3V and 5V. Just take note that the Avo is not scaled up to the rails because there is always a headroom from the supplies of at least 500mV. 
 Hope this helps. Happy New Year! 
 Regards, 
 Anna

ADIApproved · Answer

Hi, moto. 
 According to the applications engineer of AD8541, 
 "The AD854x data sheet is a little surprising to me as well. We usually change Vo conditions with respect to different supply voltage. For example, take a look at the ADA4661-2. 
 http://www.analog.com/static/imported-files/data_sheets/ADA4661-2.pdf 
 Vout is set to be 1.5V from the rails. 
 There is no strict rule of determining Vo as far as I know. Vos vs Vout graph usually suffers and takes off at both ends. So, having a narrower range of Vout usually gives a better Avo number. In most of our newer data sheets, Vo scales with Vsy. We would choose Vo to be 0.5V – 1.5V away from the rails and measure delta Vout / delta Vos." 
 Hope this helps. 
 Regards, 
 Anna