AD547 Analog Devices, AD547 Datasheet - Page 7

• Manufacturer Part Number: AD547
• Description: High Performance/ BiFET Operational Amplifiers
• Manufacturer: Analog Devices

REV. B
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 23a. Unity Gain Follower
Pulse Response (Large Signal)
Figure 24a. Unity Gain Inverter
Figure 26. Settling Characteristic Detail–AD544
Figure 25. Settling Time Test Circuit
Figure 23b. Unity Gain Follower
Pulse Response (Small Signal)
Figure 24b. Unity Gain Inverter
Pulse Response (Large Signal)
–7–
The circuit in Figure 27 employs a 100
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
capacitance, C
Figure 27. Circuit for Driving a Large Capacitance Load
Figure 28. Transient Response R
C
L
= 500 pF–AD544
L
.
Figure 23c. Unity Gain Follower
Figure 24c. Unity Gain Inverter
Pulse Response (Small Signal)
AD542/AD544/AD547
series resistor and the load
L
isolation resistor
= 2 k