AD542/AD544/AD547

REV. B

–7–

Figure 23b. Unity Gain Follower

Pulse Response (Small Signal)

Figure 24b. Unity Gain Inverter

Pulse Response (Large Signal)

Figure 23c. Unity Gain Follower

Figure 24c. Unity Gain Inverter

Pulse Response (Small Signal)

Figure 23a. Unity Gain Follower

Pulse Response (Large Signal)

Figure 24a. Unity Gain Inverter

Figure 27. Circuit for Driving a Large Capacitance Load

The circuit in Figure 27 employs a 100

Ω isolation resistor

which enables the amplifier to drive capacitance loads exceeding

500 pF; the resistor effectively isolates the high frequency feed-

back from the load and stabilizes the circuit. Low frequency

feedback is returned to the amplifier summing junction via the

low-pass filter formed by the 100

Ω series resistor and the load

Figure 25. Settling Time Test Circuit

The upper trace of the oscilloscope photograph of Figure 26

shows the settling characteristic of the AD544. The lower trace

represents the input to Figure 27. The AD544 has been designed

for fast settling to 0.01%, however, feedback components, cir-

cuit layout and circuit design must be carefully considered to

obtain optimum settling time.

Figure 26. Settling Characteristic Detail–AD544