How high of an output current can the ADA4661-2 and ADA4666-2 drive?
The ADA4661-2 and ADA4666-2 are capable of driving output currents up to 30 mA with only 1V of dropout voltage. However, the usable output load current drive is limited to…
This is normal for most op amps. As you go higher in frequency, the noise from the tail current source
gets coupled into the input through the base-emitter capacitance. This effect is not well known.
See page 28 of the ADA4666-2 data sheet, rev 0.…
I'm surprised it is doing anything.
-- You need at least 5V across the part to wake it up
-- It is not RR input; you need to stay at least 1.5V away from either rail.
Try an ADA4084-2 or an ADA4528-2
For the LMC662,, you could also look at:
I don't know what your highest frequency is, but for driving 2-5 meters of cable and capacitance,
I would not use a micropower CMOS op amp; they have wimpy output stages. Depending on
how much supply current you can spare, I would look at…