ADA4627-1ARZ Datasheet, PDF (16/20 Pages) Analog Devices – 30 V, High Speed, Low Noise, Low Bias Current

ADA4627-1/ADA4637-1
DECOMPENSATED OP AMPS
The ADA4637-1 is a decompensated op amp, and, as such, must
always be operated at a noise gain of 5 or greater. See tutorial
MT-033, Voltage Feedback Op Amp Gain and Bandwidth, at
www.analog.com for more information.
DRIVING CAPACITIVE LOADS
Adding capacitance to the output of any op amp results in addi-
tional phase shift, which reduces stability and leads to overshoot
Data Sheet
or oscillation. The ADA4627-1/ADA4637-1 have a high phase
margin and low output impedance, so they can drive reasonable
values of capacitance. This is a common situation when an
amplifier is used to drive the input of switched capacitor ADCs.
For other considerations and various circuit solutions, see the
Analog Dialogue article titled Ask the Applications Engineer-25,
Op Amps Driving Capacitive Loads, available at www.analog.com.
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