To improve step response when R

′ > 2kΩ, connect

ting resistor (Figure 5).

Driving Capacitive Loads

The MAX4230–MAX4234 have a high tolerance for

capacitive loads. They are stable with capacitive loads

up to 780pF. Figure 6 is a graph of the stable operating

region for various capacitive loads vs. resistive loads.

Figures 7 and 8 show the transient response with

excessive capacitive loads (1500pF), with and without

the addition of an isolation resistor in series with the

output. Figure 9 shows a typical noninverting capaci-

tive-load-driving circuit in the unity-gain configuration.

High-Output-Drive, 10MHz, 10V/µs,

Rail-to-Rail I/O Op Amps with Shutdown in SC70

______________________________________________________________________________________

11

MAX4230

R

R

INVERTING

MAX4230

R

R

NONINVERTING

Figure 5. Inverting and Noninverting Amplifiers with Feedback

Compensation

0

500

1500

1000

2000

2500

1

100

10

1k

10k

100k

RESISTIVE LOAD (

Ω)

STABLE

UNSTABLE

Figure 6. Capacitive-Load Stability

1

µs/div

20mV/div

20mV/div

Figure 8. Small-Signal Transient Response with Excessive

Capacitive Load with Isolation Resistor

1

µs/div

20mV/div

20mV/div

Figure 7. Small-Signal Transient Response with Excessive

Capacitive Load