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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
The front page of the LMC6044 datasheet, Features,
• Output Swing within 10 mV of Supply Rail, • Input Common-Mode Range Includes V−
for the LT1114 look at the two diagrams that I indicated above.
To achieve the precision and speed of the LT1114 I assume that the internal circuitry traded off input and output range to achieve precision.
I would go for +/- supplies, for initial testing/development 2x 9v battery would be ideal, (less than 500uA per amplifier = less than 2mA for LT1114) later a dc/dc converter can be made or purchased, or a +/- supply psu used.
P.S. I haven't had a good look for an alternative op-amp yet but I suspect that if you need precision you will need +/- supplies hopefully one of our members knows of a precision op-amp with input common mode down to 0V (V-) .... anyone ?
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problem buying right opamp
