ADA4627-1/ADA4637-1

Data Sheet

Rev. E | Page 16 of 20

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

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.