Data Sheet

ADA4620-1, ADA4620-2

analog.com

Rev. 0

45 of 49

Figure 134. Large Signal Noninverting Output Behavior, Without Input RC

The inverting case is relatively easy to improve, as it simply involves adding a feedback C that most designs include

anyway. Figure 135 shows results from an AV = −1 case with 1 kΩ:1 kΩ resistors and a feedback capacitor of 270 pF.

The behavior is very cleanly independent of step size. Of course, to reduce power consumption, higher value

resistors can be used, in which case the feedback capacitor value can be reduced.

Figure 135. Inverting Step Responses With 1 kΩ:1 kΩ Gain Resistors and Feedback Capacitance of 270 pF

For the noninverting case, this output behavior can be mitigated by slowing the input drive slew and/or adding a

small RC before the IN+ pin. See Figure 136, where the ramp rate is reduced to 80 V/µs and goes into a 330 Ω, 330 pF

RC before the ADA4620.

AV = +1

INPUT PULSES ARE DASHED LINES

OUTPUT PULSES ARE SOLID LINES

TIME (1µs/DIV)

TIME (1μs/DIV)

AV = –1