Hi,
This is a 2 parter Slight smile, and any help would be much appreciated.
Current Situation:
A previous engineer on my project was trying to use the LT1010 with V-=0V (DC gnd) and V+=12V, whilst trying to get the Vout to swing from 0V to 12V. This chip isn't a rail to rail device but should be able to get an output swing of Vout=0.3V to 11.7V ish if the Vin is 0-12V (ie Vin = 6v so Vout =6v (but with the ability to drive more current if needed)). Now on the next board I need to find a chip that can do rail to rail as mentioned below in part 2.
Part 1: Testing the LT1010
I tested the LT1010, with: V+=12, V-=0V, Vin =0,0.5,1,1.5 ... 11.5,12V then measuring Vout against Vin. The data sheet doesnt mention much about gain linearity but I noticed that when testing Vin <1v the gain seemed to be less then 0.8, is this what should be expected?
Because of this I then tested, with: V+=12, V-=-5V, Vin =-5,-4.5.-4.0 ... 11.5,12V then measuring Vout against Vin. When Vin approached -1 to 1v across 0v, the gain was really poor.
Part 1 Questions:
1. For testing in dual power supply mode why would the gain be poor between -1v and 1v, is this what you expect? if not could you supply a dual supply topology test that i could run?
Part 2: Alternative chips
What I actually need:
I need a voltage Follower / Power Amplifier with unity gain to go from rail to rail with a V- = 0 (or as close to as possible) and V+ probably being around 14-20v and with about 30+ max output. Would anyone be able to suggest a similar chip to the LT1010 that can do this? (from looking it seems really difficult to find appropriate chips for this purpose)
